Configuring Optical Interface Modules

This chapter describes the most common configurations for optical interface modules on the Cisco ASR 900 Series Router.

New and Changed Information

Feature

Where Documented

Channelization

Channelization on OC-3

Configuring the Controller

Configuring SDH

Configuring SONET Mode

MPLS on POS interfaces

Configuring SDH in POS Mode

Configuring SONET POS Mode

POS Concatenation

POS Concatenation on STM-1 and STM-4

CEM

Configuring SDH in POS Mode

Configuring SONET POS Mode

PPP, MLPPP on OC-3 interface

PPP and MLPPP on OC-12 interface

HDLC, PPP, MLPPP support on 32xT1/E1 and 8xT1/E1 interface modules

MLPPP Configuration Guidelines

DS3 Framing on OC-3 and OC-12

Configuring DS3 Clear Channel in SDH Mode

Configuring DS3 Clear Channel in SONET Mode

Limitations and Restrictions

  • Optical interfaces are not supported on the ASR 903 RSP3 Module.

The following limitations and restrictions apply when configuring optical interface modules on the Cisco ASR 900 Series Router:

  • SDH framing mode is supported; SONET framing is supported beginning in Release 3.8.
  • On the OC-3 controller, framing mode is applicable on the interface module and per port. When framing mode is set to SONET, all the 4 ports on the interface module are enabled for SONET mode. Similarly, when framing mode is set to SDH mode, all 4 ports on the interface module are enabled for SDH mode.
  • The OC-3 controller supports Asynchronous mode at the V5 byte level for Plesiochronous Digital Hierarchy (PDH). This value cannot be modified. If a mismatch occurs between the V5 byte, and the peer (remote router), loss of frames may be observed at the PDH level.
  • HDLC, PPP, and MLPPP encapsulation are supported. In POS mode, HDLC and PPP are supported.
  • ATM Layer 2 AAL0 and AAL5 encapsulation types are supported.
  • E1 unframed encapsulation is not supported except using SAToP pseudowire interfaces.
  • Unframed T1 is supported only for SATOP. E1 unframed is supported.
  • MPLS-TP is not supported over Packet Over Sonet (POS) interfaces.
  • Multicast is not supported on OC-12 interfaces.
  • QoS is supported using MLPPP interfaces and egress POS interfaces.
  • MPLS is supported only on PoS interfaces; MPLS on T1/E1 MLP is supported starting with Cisco IOS XE Release 3.9.
  • MPLS over MLP also supported.
  • Channelization is not supported for serial interfaces. However, Channelization is supported for CEM at the DS0 level.
  • DS3 Clear channel is supported only on CEM.
  • BERT is not supported on DS0 and DS1 CEM. It is supported only on DS3 CEM mode.
  • Configurations on the interface module must be completely removed before moving the interface module to a different slot on the router.
  • Mixed configurations of features are not supported on the same port. For example, one OC-3 port can have only CEM (CESoP or SAToP) or ATM or IMA or DS3 configurations, but not a combination of these features on a single port.
  • CEM is not supported across OC12/ STM-4 interface module. CEM is supported on the first AU-4 of OC-3/STM-1 interface module.

Configuring the Controller

Starting with Cisco IOS XE Release 3.10, OC-3 and OC-12 is licensed. For information on licensing these interfaces, see Licensing the OC-3 and OC-12 Interface Modules .


Note
When the mode is changed, the interface module reloads.

Command

Purpose

platform enable controller controller-type slot/subslot/port

Router(config)# platform enable controller SONET 0/2/3

Enables the ports on slot where the interface is present.

Note    The slot number for the controller sonet is always zero on the router.
  • controller—Configures a specific controller
  • controller-type—Type of controller.

controller sonet slot/subslot/port 

Router(config)# controller sonet 0/2/3

Selects the controller to configure and enters controller configuration mode, where:

  • slot/subslot/port —Specifies the location of the interface.
Note    The slot number is always zero on the Cisco ASR 900 Series Router.

Configuring SDH

The following sections describe how to configure SDH on the optical interface module:

Configuring SDH Mode

SDH T1 Mode

To configure SDH T1 mode, complete the following steps:

SUMMARY STEPS

    1.    framing sdh

    2.    aug mapping {au-4}

    3.    clock source {internal | line}

    4.    au-4 au-4# tug-3 tug-3#

    5.    In SDH framing in AU-4 mode:

    6.    SAToP CEM Group

    7.    exit

    8.    controller t1 interface-path-id

    9.    Creates a CEM group, IMA group, or channel-group on the T1 or E1 controller.


DETAILED STEPS
     Command or ActionPurpose
    Step 1framing sdh


    Example:
    Router(config-controller)# framing sdh
     

    Specifies SDH as the frame type.

     
    Step 2aug mapping {au-4}

    Example:
    Router(config-controller)# aug mapping au-4
     

    Configures AUG mapping for SDH framing.

     
    Step 3clock source {internal | line}

    Example:
    Router(config-controller)# clock source line
     

    Sets the clock source, where:

    • internal—Specifies that the internal clock source is used.
    • line—Specifies that the network clock source is used. This is the default for T1 and E1.
     
    Step 4au-4 au-4# tug-3 tug-3#


    Example:
    Router(config-controller)# au-4 1 tug-3 3
     

    Configures AU-4, and tributary unit groups, type 3 (TUG-3) for AU-4 and enters specific configuration mode.

    • au-4#—Range is from 1 to 4 for OC-12 mode and 1 for OC-3 mode
    • tug-3#—Range is from 1 to 3.
     
    Step 5 In SDH framing in AU-4 mode:

    Example:
    mode {c-11 | c-12 | t3 | e3}


    Example:
    Router(config-ctrlr-tug3)# mode {c-11 | c-12 | t3 | e3}


    Example:
    
 

    Example:
    
 

    Example:
    In SDH framing AU-3 mode:
    
 

    Example:
    mode {c-11 | c-12 | t3 | e3}
    
 

    Example:
    Router(config-ctrlr-au3)# mode {c-11 | c-12 | t3 | e3}
    
 
          		 

    
(Optional) Configures mode of operation for AU-3 or AU-4 mode, where:
    


    
C-11 and C-12 are container level-n (SDH) channelized T3s. They are types of T3 channels that are subdivided into 28 T1 channels.
    


    • c-11—Specifies an AU-3/AU-4 TUG-3 divided into seven TUG-2s. Each TUG-2 is then divided into four TU11s, each carrying a C-11 T1.
      • 

    • c-12—Specifies an AU-3/AU-4 TUG-3 divided into seven TUG-2. Each TUG-2 is then divided into three TU12s, each carrying a C-12 E1.
      • 

    • t3—Specifies an AU-3/AU-4 TUG-3 carrying an unchannelized (clear channel) T3.
      • 

    • e3—Specifies an AU-3/AU-4 TUG-3 carrying an unchannelized (clear channel) E3.
      • 

    


    Note   
                
              
Only c-11 and c-12 are currently supported.
    

 
      
    

    Step 6
SAToP CEM Group
     

    Example:
    tug-2 1 e1 1 cem-group 1 unframed
    
 

    Example:
    Router(config-ctrlr-tug3)# tug-2 1 e1 1 cem-group 1 unframed
    
 

    Example:
    
CESoPSN CEM Group
    
 

    Example:
    tug-2 1 e1 1 cem-group 1 timeslots 1-31
    
 

    Example:
    Router(config-ctrlr-tug3)# tug-2 1 e1 1 cem-group 1 timeslots 1-31
    
 

    Example:
    
 

    Example:
    
IMA Group
    
 

    Example:
    tug-2 1 e1 1 ima-group 1
    
 

    Example:
    Router(config-ctrlr-tug3)# tug-2 1 e1 1 ima-group 1
    
 

    Example:
    
 

    Example:
    
Channel Group
    
 

    Example:
    tug-2 1 e1 1 [[channel-group channel-group-number] [timeslots list-of-timeslots]]
    
 

    Example:
    Router(config-ctrlr-tug3)# tug-2 1 e1 1 channel-group 1 timeslots 1-31]
    
 

    Example:
    
 
          		 

    
Creates a CEM group, IMA group, or channel-group for the AU-3 or AU-4. Valid values are:
    


    • 
e1— 1–3
      • 

    • tug-3—1-3
      • 

    • tug-2—1–7
      • 

    • unframed—Specifies that a single CEM channel is being created including all time slots and the framing structure of the line.
      • 

    

 
      
    

    Step 7
exit 

    Example:
    Router(config-controller)# exit
    
 
          		 

    
Exits controller configuration mode.
    

 
      
    

    Step 8controller t1 interface-path-id
     

    Example:
    Router(config-controller)# controller t1 0/1/1/0/0/0 
    
 
          		 

    
Enters controller configuration mode for an individual T1 or E1.
    

 
      
    

    Step 9
Creates a CEM group, IMA group, or channel-group on the T1 or E1 controller. 
       

    SAToP CEM Group
    


    Router(config-ctrlr)# t1 cem-group 1 unframed
    


    


    CESoPSN CEM Group
    


    Router(config-ctrlr)# t1 cem-group 1 timeslots 1-24
    


    


    Clear-Channel ATM
    


    Router(config-ctrlr-tug3)# e1 1 atm
    


    


    IMA Group
    


    Router(config-ctrlr-tug3)# e1 1 ima-group 1
    


    


    


    Channel Group
    


    Router(config-ctrlr)# t1 2 channel-group 4 [[channel-group channel-group-number] [timeslots list-of-timeslots]]
    


    

 
      
    

    
What to Do Next
    

    
Example
    


    
The example configures SDH E1 mode:
    


    Router# configure terminal
Router(config)# controller sonet 0/1/0
Router(config-controller)# framing sdh
Router(config-controller)# aug mapping au-4
Router(config-controller)# clock source internal
Router(config-controller)# au-4 1 tug-3 2
Router(config-ctrlr-tug3)# tug-2 1 e1 1 channel-group 1 timeslots 1-31

    


    

    

    SDH T1 Mode
    

    

    
To configure SDH T1 mode, complete the following steps:
    


    
SUMMARY STEPS
      1.   
      framing sdh
      

      2.   
      aug mapping {au-3}
      

      3.   
      clock source {internal | line}
      

      4.   
      au-3 au-3#
      

      5.   
      
In SDH framing in AU-4 mode:
      

      6.   
      
SAToP CEM Group
      

      7.   
      
exit
      

      8.   
      controller t1 interface-path-id
      

      9.   
      
Creates a CEM group, IMA group, or channel-group on the T1 or E1 controller.
      


    DETAILED STEPS
       Command or ActionPurpose
      Step 1framing sdh
       

      Example:
      Router(config-controller)# framing sdh
      
 
            		 

      
Specifies SDH as the frame type.
      

 
      
      

      Step 2aug mapping {au-3} 

      Example:
      Router(config-controller)# aug mapping au-3
      
 
            		 

      
Configures AUG mapping for SDH framing. 
      


      
Supports au-3 and au-4 aug mapping. The default setting is au-3.
      

 
      
      

      Step 3clock source {internal | line} 

      Example:
      Router(config-controller)# clock source line 
      
 
            		 

      
Sets the clock source, where:
      


      • 
internal—Specifies that the internal clock source is used. 
        • 

      • 
line—Specifies that the network clock source is used. This is the default for T1 and E1.
        • 

      

 
      
      

      Step 4au-3 au-3#
       

      Example:
      Router(config-controller)# au-3 au-3#
      
 
            		 

      
Configures AU-3, and enters specific configuration mode. 
      


      • au-3# —Range is from 1 to 12 for OC-12 mode. For OC-3 mode, the value is 1–3.
        • 

      

 
      
      

      Step 5
In SDH framing in AU-4 mode: 

      Example:
      mode {c-11 | c-12 | t3 | e3}
      
 

      Example:
      Router(config-ctrlr-tug3)# mode {c-11 | c-12 | t3 | e3}
      
 

      Example:
      
 

      Example:
      
 

      Example:
      In SDH framing AU-3 mode:
      
 

      Example:
      mode {c-11 | c-12 | t3 | e3}
      
 

      Example:
      Router(config-ctrlr-au3)# mode {c-11 | c-12 | t3 | e3}
      
 
            		 

      
(Optional) Configures mode of operation for AU-3 or AU-4 mode, where:
      


      
C-11 and C-12 are container level-n (SDH) channelized T3s. They are types of T3 channels that are subdivided into 28 T1 channels.
      


      • c-11—Specifies an AU-3/AU-4 TUG-3 divided into seven TUG-2s. Each TUG-2 is then divided into four TU11s, each carrying a C-11 T1.
        • 

      • c-12—Specifies an AU-3/AU-4 TUG-3 divided into seven TUG-2. Each TUG-2 is then divided into three TU12s, each carrying a C-12 E1.
        • 

      • t3—Specifies an AU-3/AU-4 TUG-3 carrying an unchannelized (clear channel) T3.
        • 

      • e3—Specifies an AU-3/AU-4 TUG-3 carrying an unchannelized (clear channel) E3.
        • 

      


      Note   
                
              
Only c-11 and c-12 are currently supported.
      

 
      
      

      Step 6
SAToP CEM Group
       

      Example:
      tug-2 1 t1 1 cem-group 1 unframed
      
 

      Example:
      Router(config-ctrlr-au3)# tug-2 1 t1 1 cem-group 1 unframed
      
 

      Example:
      
CESoPSN CEM Group
      
 

      Example:
      tug-2 1 e1 1 cem-group 1 timeslots 1-31
      
 

      Example:
      Router(config-ctrlr-au3)# tug-2 1 t1 1 cem-group 1 timeslots 1-31
      
 

      Example:
      
 

      Example:
      
IMA Group
      
 

      Example:
      tug-2 1 t1 1 ima-group 1
      
 

      Example:
      Router(config-ctrlr-au3)# tug-2 1 t1 1 ima-group 1
      
 

      Example:
      
 

      Example:
      
Channel Group
      
 

      Example:
      tug-2 1 e1 1 [[channel-group channel-group-number] [timeslots list-of-timeslots]]
      
 

      Example:
      Router(config-ctrlr-tug3)# tug-2 1 t1 1 channel-group 0 timeslots 1-31
      
 

      Example:
      
 
            		 

      
Creates a CEM group, IMA group, or channel-group for the AU-3 or AU-4. Valid values are:
      


      • t1—Range is from 1 to 12 for OC-12 mode. For OC-3 mode, the value is 1–3.
        • 

      • tug-2—1–7
        • 

      • unframed—Specifies that a single CEM channel is being created including all time slots and the framing structure of the line.
        • 

      

 
      
      

      Step 7
exit 

      Example:
      Router(config-controller)# exit
      
 
            		 

      
Exits controller configuration mode.
      

 
      
      

      Step 8controller t1 interface-path-id
       

      Example:
      Router(config-controller)# controller t1 0/1/1/0/0/0 
      
 
            		 

      
Enters controller configuration mode for an individual T1 or E1.
      

 
      
      

      Step 9
Creates a CEM group, IMA group, or channel-group on the T1 or E1 controller. 
       

      SAToP CEM Group
      


      Router(config-ctrlr)# t1 cem-group 1 unframed
      


      


      CESoPSN CEM Group
      


      Router(config-ctrlr)# t1 cem-group 1 timeslots 1-24
      


      


      Clear-Channel ATM
      


      Router(config-ctrlr-tug3)# e1 1 atm
      


      


      IMA Group
      


      Router(config-ctrlr-tug3)# e1 1 ima-group 1
      


      


      


      Channel Group
      


      Router(config-ctrlr)# t1 2 channel-group 4 [[channel-group channel-group-number] [timeslots list-of-timeslots]]
      


      

 
      
      

      
What to Do Next
      

      
The example configures SDH T1 mode:
      


      Router# configure terminal
Router(config)# controller sonet 0/1/0
Router(config-controller)# framing sdh
Router(config-controller)# aug mapping au-3
Router(config-controller)# au-3 1 
      


      
Router(config-ctrlr-au3)# tug-2 1 t1 1 channel-group 1 timeslots 1-31
      


      
For information about configuring optional features, see Optional Configurations.
      


      

      

      

      Configuring SDH in POS Mode
      

      

      
Follow these steps to configure SDH in POS mode on the optical interface module.
      


      
SUMMARY STEPS
        1.   
      controller sonet slot/subslot/port

        

        2.   
      framing {sonet | sdh}
        

        3.   
      aug mapping {au-3 | au-4}
        

        4.   
      au-4 au-4-number pos
        

        5.   
      end
        


      DETAILED STEPS
         Command or ActionPurpose
        Step 1controller sonet slot/subslot/port

         

        Example:
        
 

        Example:
        Router(config)# controller sonet 0/1/0
        
 
              		 

        
Selects the controller to be configured.
        

 
      
        

        Step 2framing {sonet | sdh}
         

        Example:
        Router(config)# framing sdh
        
 
              		 

        
Specifies SDH as the framing mode. 
        


        Note   
                
              
The interface module reloads if the framing is changed.
        

 
      
        

        Step 3aug mapping {au-3 | au-4} 

        Example:
        Router(config-controller)# aug mapping au-4 
        
 
              		 

        
Specifies AUG mapping.
        


        Note   
                
              
POS mode is only supported with AU-4 mode.
        

 
      
        

        Step 4au-4 au-4-number pos
         

        Example:
        Router(config-controller)# au-4 1 pos
        
 
              		 

        
Selects the AU-4 to be configured in POS mode with SDH framing. The command creates a POS interface, such as POS0/0/1:1. In OC-3 mode, the value is 1; in OC-12 mode, valid values are 1-4.
        

 
      
        

        Step 5end
         

        Example:
        Router(config-controller)# end
        
 
              		 

        
Exits configuration mode.
        

 
      
        

        

        

        

        Configuring SONET Mode
        

        Example
        

        Router# configure terminal
Router(config)# controller sonet 0/1/0
Router(config-controller)# framing sdh
Router(config-controller)# aug mapping au-4
Router(config-controller)# au-4 1 pos
Router(config-controller)# end

        


        
For information about configuring optional features, see Optional Packet over SONET Configurations
        


        

        

        

        

        Configuring SONET Mode
        

        
The following sections describe how to configure SONET mode on the optical interface module:
        

        

        Configuring SONET Mode
        

        

        
To configure an interface module to use SONET mode:
        


        
SUMMARY STEPS
          1.   
      controller sonet slot/subslot/port
          

          2.   
      framing {sonet | sdh}
          

          3.   
      clock source {line | internal}
          

          4.   
      sts-1 {1 - 12 | 1 - 3 | 4 - 6 | 7 - 9 | 10 - 12}
          

          5.   
      vtg vtg-number t1 t1-line-number channel-group channel-group-no timeslots list-of-timeslots
          

          6.   
      end
          


        DETAILED STEPS
           Command or ActionPurpose
          Step 1controller sonet slot/subslot/port
           

          Example:
          Router(config)# controller sonet 0/1/0
          
 
                		 

          
Selects the controller to be configured.
          

 
      
          

          Step 2framing {sonet | sdh}
           

          Example:
          Router(config-controller)# framing sonet
          
 
                		 

          
Specifies SONET as the framing mode. 
          

 
      
          

          Step 3clock source {line | internal} 

          Example:
          Router(config-if)# clock source line
          
 
                		 

          
Specifies the clock source for the POS link, where:
          


          • line—The link uses the recovered clock from the line. This is the default setting.
            • 

          • internal—The link uses the internal clock source.
            • 

          

 
      
          

          Step 4sts-1 {1 - 12 | 1 - 3 | 4 - 6 | 7 - 9 | 10 - 12}
           

          Example:
          Router(config-controller)# sts-1 1 - 3
          
 
                		 

          
Specifies the SONET Synchronous Transport Signal (STS) level and enters STS-1 configuration mode. The starting-number and ending-number arguments indicate the starting and ending STS value of the interface. 
          


          
For OC-3 interfaces, this value is 1.
          


          Note   
                
              
The 1-12 value is supported only in OC-12 mode.
          

 
      
          

          Step 5vtg vtg-number t1 t1-line-number channel-group channel-group-no timeslots list-of-timeslots
           

          Example:
          Router(config-if)# vtg 1 t1 1 channel-group 0 timesolts 1-24
          
 
                		 

          
Configures the T1 on the VTG, where 
          


          • vtg-number—Specifies the VTG number. The framing is1-7
            • 

          • t1 t1-line-number—1-4
            • 

          • channel-group channel-group-no—0-24
            • 

          • timeslots list-of-timeslots—1-24
            • 

          

 
      
          

          Step 6end
           

          Example:
          Router(config-if)# end
          
 
                		 

          
Exits configuration mode.
          

 
      
          

          
What to Do Next
          

          
The below example shows the configuration for the DS1 T1 serial interface:
          


          Router# configure terminal
Router(config)# controller sonet 0/1/0
Router(config-controller)# framing sonet
Router(config-controller)# clock source line
Router(config-controller)# sts-1 1 - 3
Router(config-ctrlr-sts1)# vtg 1 t1 1 channel-group 0 timeslot 1-24
Router(config-controller)# end
          


          

          


          
For information on optional SONET configurations, see Optional Configurations. For information on optional ATM, IMA, POS and Serial interface configuration, see Optional Configurations.
          


          

          

          Configuring SONET POS Mode
          

          

          
To configure an interface module to use SONET in POS mode, perform the following procedure.
          


          
SUMMARY STEPS
            1.   
      controller sonet slot/subslot/port
            

            2.   
      framing {sonet | sdh}
            

            3.   
      clock source {line | internal}
            

            4.   
      sts-1 {1- 12 | 1 - 3 | 4 - 6 | 7 - 9 | 10 - 12} pos
            

            5.   
      exit
            

            6.   
      Do one of the following:
            • interface POS slot/subslot/port
              • 

            • 

            • interface POS slot/subslot/port.POS-interface
              • 

            • 

            • interface POS slot/subslot/port:POS-interface
              • 

            

            

            7.   
      encapsulation encapsulation-type {hdlc | ppp}
            

            8.   
      end
            


          DETAILED STEPS
             Command or ActionPurpose
            Step 1controller sonet slot/subslot/port
             

            Example:
            Router(config)# controller sonet 0/1/0
            
 
                  		 

            
Selects the controller to be configured.
            

 
      
            

            Step 2framing {sonet | sdh}
             

            Example:
            Router(config-controller)# framing sonet
            
 
                  		 

            
Specifies SONET as the framing mode. 
            

 
      
            

            Step 3clock source {line | internal} 

            Example:
            Router(config-controller)# clock source line
            
 
                  		 

            
Specifies the clock source for the POS link, where:
            


            • line—The link uses the recovered clock from the line. This is the default setting.
              • 

            • internal—The link uses the internal clock source.
              • 

            

 
      
            

            Step 4sts-1 {1- 12 | 1 - 3 | 4 - 6 | 7 - 9 | 10 - 12} pos
             

            Example:
            Router(config-controller)# sts-1 1 - 3 pos
            
 
                  		 

            
Specifies POS mode; starting-number and ending-number arguments indicate the starting and ending STS value of the POS interface. For OC-3 interfaces, this value is 1. 
            


            Note   
                
              
The 1-12 value is supported only in OC-12 mode.
            

 
      
            

            Step 5exit
             

            Example:
            Router(config-controller# exit
            
 
                  		 

            
Exits controller configuration mode.
            

 
      
            

            Step 6Do one of the following:
            • interface POS slot/subslot/port
              • 

            • 

            • interface POS slot/subslot/port.POS-interface
              • 

            • 

            • interface POS slot/subslot/port:POS-interface
              • 

            
 

            Example:
            interface POS0/0/1
            
 

            Example:
            interface POS0/0/1.1
            
 

            Example:
            interface POS0/0/1:1
            
 
                  		 

            
Use any of the following commands to access the POS interface.
            

 
      
            

            Step 7encapsulation encapsulation-type {hdlc | ppp}
             

            Example:
            Router(config-if)# encapsulation hdlc
            
 
                  		 

            
Configures encapsulation; you can configure the following options:
            


            • hdlc—Serial HDLC. This is the default for synchronous serial interfaces
              • 

            • ppp—Point-to-Point Protocol (for serial interface).
              • 

            

 
      
            

            Step 8end
             

            Example:
            Router(config-if)# end
            
 
                  		 

            
Exits configuration mode.
            

 
      
            

            
What to Do Next
            

            
Example
            


            Router# configure terminal
Router(config)# controller sonet 0/1/0
Router(config-controller)# framing sonet
Router(config-controller)# clock source line
Router(config-controller)# sts-1 1 - 3 pos
Router(config-controller)# exit
Router(config)# interface POS0/0/1
Router(config-if)# encapsulation hdlc
Router(config-if)# end

            


            
For information on optional SONET configurations, see Configuring SONET POS Mode.
            


            

            

            

            Configuring a CEM group
            

            

            Configuring CEM Group in SONET Mode
            

            

            
To configure a T1 CEM group in SONET mode:
            


            
SUMMARY STEPS
              1.   
      enable
              

              2.   
      configure terminal 
              

              3.   
      controller sonet slot/bay/port 
              

              4.   
      framing {sonet | sdh} 
              

              5.   
      sts-1 {1 - 12 | 1 - 3 | 4 - 6 | 7 - 9 | 10 - 12}
              

              6.   
      mode {t3 | vt-15} 
              

              7.   
      
SATOP CEM 
              

              8.   
      end 
              


            DETAILED STEPS
               Command or ActionPurpose
              Step 1enable
               
                    		 

              
Enables privileged EXEC mode.
              


              • 
Enter your password if prompted
                • 

              

 
      
              

              Step 2configure terminal 
               
                    		 

              
Enters global configuration mode.
              

 
      
              

              Step 3controller sonet slot/bay/port 
               

              Example:
              

              
 

              Example:
              Router(config)# controller sonet 0/4/1
              
 
                    		 

              
Selects the controller to configure and enters controller configuration mode, where:
              


              • slot/bay/port—Specifies the location of the interface. 
                • 

              


              Note   
                
              
The slot number is always 1 and the bay number is always 0. 
              

 
      
              

              Step 4framing {sonet | sdh} 
               

              Example:
              

              
 

              Example:
              Router(config)# framing sonet
              
 
                    		 

              
Specifies SONET as the framing mode.
              

 
      
              

              Step 5sts-1 {1 - 12 | 1 - 3 | 4 - 6 | 7 - 9 | 10 - 12}
               

              Example:
              Router(config-controller)# sts-1 1 - 3
              
 
                    		 

              
Specifies the SONET Synchronous Transport Signal (STS) level and enters STS-1 configuration mode. The starting-number and ending-number arguments indicate the starting and ending STS value of the interface. 
              


              
For OC-3 interfaces, this value is 1.
              


              Note   
                
              
The 1-12 value is supported only in OC-12 mode.
              

 
      
              

              Step 6mode {t3 | vt-15} 
               

              Example:
              

              
 

              Example:
              Router(config-ctrlr-sts1-3)# mode t3 
              
 
                    		 

              
Specifies the mode of operation of an STS-1 path, where: 
              


              Note   
                
              
Note VT-15 is the only supported mode. 
              


              • t3—DS3 clear channel mode. STS-1carries an unchannelized (clear channel) T3. 
                • 

              • vt-15—A STS-1 is divided into seven Virtual Tributary Groups (VTG). Each VTG is then divided into four VT1.5's, each carrying a T1. 
                • 

              

 
      
              

              Step 7
SATOP CEM 
               

              Example:
              cem-group channel-number unframed 
              
 

              Example:
              Router(config-ctrlr-sts1-3)# cem-group 0 unframed
              
 

              Example:
              
CeSOP CEM
              
 

              Example:
              vtg vtg_number t1 t1_line_number cem-group channel-number timeslots list-of-timesolts
              
 

              Example:
              Router(config-ctrlr-sts1-3)# vtg 1 t1 1 cem-group 1 timeslots 1-10
              
 
                    		 

              
 Configures the T1 on the VTG, where:
              


              • vtg_number—Specifies the VTG number. For SONET framing, values are 1 to 7. 
                • 

              • t1_line_number—Specifies the T1 line number. Valid range is 1 to 4.
                • 

              • channel-number—Specifies the channel number. Valid range is 0 to 2015.
                • 

              • list-of-timeslots—Specifies the list of timeslots. Valid range is from 1 to 24.
                • 

              

 
      
              

              Step 8end 
               
                    		 

              
Exits controller configuration mode and returns to privileged EXEC mode.
              

 
      
              

              
What to Do Next
              

              
Example
              


              
The example shows a CEM interface configuration:
              


              Router# configure terminal
Router(config)# controller sonet 0/1/0
Router(config-controller)# framing sonet
Router(config-controller)# sts-1 1 
Router(config-ctrlr-sts1)# vtg 1 t1 1 cem-group 1 timeslots 1-10
Router(config-ctrlr-sts1)# exit

              


              

              

              Configuring CEM Group in SDH Mode
              

              

              
To configure CEM group in SDH mode:
              


              
SUMMARY STEPS
                1.   
      enable
                

                2.   
      configure terminal 
                

                3.   
      controller sonet slot/bay/port 
                

                4.   
      framing {sonet | sdh}
                

                5.   
      au-4 au-4# tug-3 tug-3# 
                

                6.   
      mode {t3 | e3}
                

                7.   
      cem-group group-number {unframed}
                

                8.   
      end
                


              DETAILED STEPS
                 Command or ActionPurpose
                Step 1enable
                 
                      		 

                
Enables privileged EXEC mode.
                


                • 
Enter your password if prompted.
                  • 

                

 
      
                

                Step 2configure terminal 
                 
                      		 

                
Enters global configuration mode.
                

 
      
                

                Step 3controller sonet slot/bay/port 
                 

                Example:
                Router(config)# controller sonet 0/1/0
                
 
                      		 

                
Selects the controller to configure and enters controller configuration mode, where:
                


                • slot/bay/port—Specifies the location of the interface. 
                  • 

                


                Note   
                
              
The slot number is always 1 and the bay number is always 0. 
                

 
      
                

                Step 4framing {sonet | sdh}
                 

                Example:
                Router(config-controller)# framing sdh
                
 
                      		 

                
Specifies SDH as the framing mode.
                

 
      
                

                Step 5au-4 au-4# tug-3 tug-3# 
                 

                Example:
                Router(config-controller)# au-4 1 tug-3 1
                
 
                      		 

                
Configures AU-4, and tributary unit groups, type 3 (TUG-3) for AU-4 and enters specific configuration mode. 
                


                
In SDH framing mode, each TUG-3, and AU-4 can be configured with one of these commands. 
                


                
Depending on currently configured AUG mapping setting, this command further specifies TUG-3, or AU-4 muxing. The CLI command parser enters into config-ctrlr-tug3 (SDH mode) or config-ctrlr-au3 (SDH mode), which makes only relevant commands visible.
                


                • 
au-4#—Range is from 1 to 4. For OC-3 mode, the value is 1. 
                  • 

                


                Note   
                
              
DS3 configuration is supported only on AuU-4.
                


                • 
tug-3#—Range is from 1 to 3.
                  • 

                


                Note   
                
              
T1 can only be configured in au-3 mode, E1 can only be configured in the au-4 mode.
                

 
      
                

                Step 6mode {t3 | e3}
                 

                Example:
                Router(config-ctrlr-tug3)# mode e3
                
 
                      		 

                
Specifies the mode of operation.
                


                • t3—Specifies an unchannelized (clear channel) T3. 
                  • 

                • e3—Specifies a AU-3 or C3 that carries a unchannelized (DS3 clear channel) E3. 
                  • 

                


                Note   
                
              
Only e3 mode is supported for SDH framing.
                

 
      
                

                Step 7cem-group group-number {unframed}
                 

                Example:
                Router(config-ctrlr-tug3)# cem-group 4 unframed
                
 
                      		 

                
Creates a CEM group.
                


                • unframed—Specifies that a single CEM channel is being created including all time slots and the framing structure of the line.
                  • 

                

 
      
                

                Step 8end
                 

                Example:
                Router(config-ctrlr-tug3)# end
                
 
                      		 

                
Exits controller configuration mode and returns to privileged EXEC mode.
                

 
      
                

                
What to Do Next
                

                
Example
                


                Router# configure terminal
Router(config)# controller sonet 0/1/0
Router(config-controller)# framing sdh
Router(config-controller)# au-4 1 tug-3 1
Router(config-ctrlr-tug3)# mode e3
Router(config-ctrlr-tug3)# cem-group 4 unframed
Router(config-ctrlr-tug3)# end
                


                

                

                

                Configuring DS3 Clear Channel on OC-3 and OC-12 Interface Module
                


                Note
                
DS3 clear channel is supported only on CEM. 
                

                

                Configuring DS3 Clear Channel in SONET Mode
                

                

                
To configure DS3 clear channel in SONET mode:
                


                
SUMMARY STEPS
                  1.   
      enable
                  

                  2.   
      configure terminal 
                  

                  3.   
      controller sonet slot/bay/port 
                  

                  4.   
      framing {sonet | sdh} 
                  

                  5.   
      clock source {line | internal}
                  

                  6.   
      sts-1 {1 - 12 | 1 - 3 | 4 - 6 | 7 - 9 | 10 - 12} 
                  

                  7.   
      mode {t3 | vt-15} 
                  

                  8.   
      
cem-group channel-number {unframed}
                  

                  9.   
      end 
                  


                DETAILED STEPS
                   Command or ActionPurpose
                  Step 1enable
                   

                  Example:
                  
 
                        		 

                  
Enables privileged EXEC mode.
                  


                  • 
Enter your password if prompted
                    • 

                  

 
      
                  

                  Step 2configure terminal 
                   
                        		 

                  
Enters global configuration mode.
                  

 
      
                  

                  Step 3controller sonet slot/bay/port 
                   

                  Example:
                  

                  
 

                  Example:
                  Router(config)# controller sonet 0/4/1
                  
 
                        		 

                  
Selects the controller to configure and enters controller configuration mode, where:
                  


                  • slot/bay/port—Specifies the location of the interface. 
                    • 

                  


                  Note   
                
              
The slot number is always 1 and the bay number is always 0. 
                  

 
      
                  

                  Step 4framing {sonet | sdh} 
                   

                  Example:
                  

                  
 

                  Example:
                  Router(config)# framing sonet
                  
 
                        		 

                  
Specifies SONET as the framing mode.
                  

 
      
                  

                  Step 5clock source {line | internal} 

                  Example:
                  Router(config-if)# clock source internal
                  
 
                        		 

                  
Specifies the clock source for the POS link, where:
                  


                  • line—The link uses the recovered clock from the line. This is the default setting.
                    • 

                  • internal—The link uses the internal clock source.
                    • 

                  

 
      
                  

                  Step 6sts-1 {1 - 12 | 1 - 3 | 4 - 6 | 7 - 9 | 10 - 12} 
                   

                  Example:
                  

                  
 

                  Example:
                  Router(config-controller)# sts-1 1
                  
 
                        		 

                  
Specifies the SONET Synchronous Transport Signal (STS) level and enters STS-1 configuration mode. The starting-number and ending-number arguments indicate the starting and ending STS value of the interface.
                  


                  
For OC-3 interfaces, this value is 1.
                  


                  
The 1-12 value is supported only in OC-12 mode.
                  

 
      
                  

                  Step 7mode {t3 | vt-15} 
                   

                  Example:
                  

                  
 

                  Example:
                  Router(config-ctrlr-sts1)# mode t3 
                  
 
                        		 

                  
Specifies the mode of operation of an STS-1 path, where: 
                  


                  • t3—DS3 clear channel mode. STS-1 carries an unchannelized (clear channel) T3. 
                    • 

                  • vt-15—A STS-1 is divided into seven Virtual Tributary Groups (VTG). Each VTG is then divided into four VT1.5's, each carrying a T1. 
                    • 

                  

 
      
                  

                  Step 8
cem-group channel-number {unframed} 

                  Example:
                  

                  
 

                  Example:
                  Router(config-ctrlr-sts1)# cem-group 4 unframed
                  
 
                        		 

                  
Creates a CEM group.
                  


                  • unframed—Specifies that a single CEM channel is being created including all time slots and the framing structure of the line.
                    • 

                  

 
      
                  

                  Step 9end 
                   
                        		 

                  
Exits controller configuration mode and returns to privileged EXEC mode.
                  

 
      
                  

                  
What to Do Next
                  

                  
Example
                  


                  
The below example shows the configuration for a DS3 interface:
                  


                  Router# configure terminal
Router(config)# controller sonet 0/1/0
Router(config-controller)# framing sonet
Router(config-controller)# clock source line
Router(config-controller)# sts-1 1 - 3
Router(config-ctrlr-sts1)# mode t3
Router(config-ctrlr-sts1)# cem-group 0 unframed
Router(config-controller)# end

                  


                  
Configuration Example
                  


                  controller SONET 1/0/0
framing sonet
clock source internal
!
sts-1 1
mode t3
cem-group 0 unframed
!
sts-1 2
mode t3
cem-group 1 unframed
!
sts-1 3
mode t3
cem-group 2 unframed
interface CEM1/0/0
no ip address
cem 0
xconnect 2.2.2.2 501 encapsulation mpls
!
cem 1
xconnect 2.2.2.2 502 encapsulation mpls
!
cem 2
xconnect 2.2.2.2 503 encapsulation mpls
! 

                  


                  

                  

                  Configuring DS3 Clear Channel in SDH Mode
                  

                  

                  
To configure DS3 clear channel in SDH mode:
                  


                  
SUMMARY STEPS
                    1.   
      enable
                    

                    2.   
      configure terminal 
                    

                    3.   
      controller sonet slot/bay/port 
                    

                    4.   
      framing {sonet | sdh}
                    

                    5.   
      clock source {line | internal}
                    

                    6.   
      aug mapping au-4
                    

                    7.   
      au-4 au-4# tug-3 tug-3# 
                    

                    8.   
      mode e3 
                    

                    9.   
      cem-group channel-number {unframed}
                    

                    10.   
      end 
                    


                  DETAILED STEPS
                     Command or ActionPurpose
                    Step 1enable
                     
                          		 

                    
Enables privileged EXEC mode.
                    


                    • 
Enter your password if prompted.
                      • 

                    

 
      
                    

                    Step 2configure terminal 
                     
                          		 

                    
Enters global configuration mode.
                    

 
      
                    

                    Step 3controller sonet slot/bay/port 
                     

                    Example:
                    Router(config)# controller sdh 0/1/0
                    
 
                          		 

                    
Selects the controller to configure and enters controller configuration mode, where:
                    


                    • slot/bay/port—Specifies the location of the interface. 
                      • 

                    


                    Note   
                
              
The slot number is always 1 and the bay number is always 0. 
                    

 
      
                    

                    Step 4framing {sonet | sdh}
                     

                    Example:
                    Router(config-controller)# framing sdh
                    
 
                          		 

                    
Specifies SDH as the framing mode.
                    

 
      
                    

                    Step 5clock source {line | internal} 

                    Example:
                    Router(config-controller)# clock source line
                    
 
                          		 

                    
Specifies the clock source for the POS link, where:
                    


                    • line—The link uses the recovered clock from the line. This is the default setting.
                      • 

                    • internal—The link uses the internal clock source.
                      • 

                    

 
      
                    

                    Step 6aug mapping au-4
                     

                    Example:
                    Router(config-controller)# aug mapping au-4
                    
 
                          		 

                    
Configures AUG mapping for SDH framing. 
                    


                    
If the AUG mapping is configured to be AU-4, then the following muxing, alignment, and mapping will be used: 
                    


                    
TUG-3 <--> VC-4 <--> AU-4 <--> AUG.
                    

 
      
                    

                    Step 7au-4 au-4# tug-3 tug-3# 
                     

                    Example:
                    Router(config-controller)# au-4 1 tug-3 1
                    
 
                          		 

                    
Configures AU-4, and tributary unit groups, type 3 (TUG-3) for AU-4 and enters specific configuration mode. 
                    


                    
In SDH framing mode TUG-3, and AU-4 can be configured with one of these commands. 
                    


                    
Depending on currently configured AUG mapping setting, this command further specifies TUG-3, or AU-4 muxing. The CLI command parser enters into config-ctrlr-tug3 (SDH mode) or config-ctrlr-au3 (SDH mode), which makes only relevant commands visible.
                    


                    • 
au-4#—Range is from 1 to 4. For OC-3 mode, the value is 1. 
                      • 

                    • 
tug-3#—Range is from 1 to 3.
                      • 

                    


                    Note   
                
              
E1 can only be configured in the AU-4 mode.
                    

 
      
                    

                    Step 8mode e3 
                     

                    Example:
                    Router(config-ctrlr-au4)# mode e3
                    
 
                          		 

                    
Specifies the mode of operation.
                    


                    • e3—Specifies a C3 that carries a unchannelized (DS3 clear channel) E3. 
                      • 

                    

 
      
                    

                    Step 9cem-group channel-number {unframed}
                     

                    Example:
                    Router(config-ctrlr-au4)# cem-group 4 unframed
                    
 
                          		 

                    
Creates a CEM group.
                    


                    • unframed—Specifies that a single CEM channel is being created including all time slots and the framing structure of the line.
                      • 

                    

 
      
                    

                    Step 10end 
                     
                          		 

                    
Exits controller configuration mode and returns to privileged EXEC mode.
                    

 
      
                    

                    
What to Do Next
                    

                    
Example
                    


                    Router# configure terminal
Router(config)# controller sonet 0/1/0
Router(config-controller)# framing sdh
Router(config-controller)# clock source line
Router(config-controller)# aug mapping au-4
Router(config-controller)# au-4 1 tug-3 1
Router(config-ctrlr-au4)# mode e3
Router(config-ctrlr-au4)# cem-group 4 unframed
Router(config-ctrlr-au4)# end

                    


                    

                    

                    

                    Optional Configurations
                    

                    
There are several standard, but optional, configurations that might be necessary to complete the configuration of your interface module.
                    

                    

                    Configuring the
	 National Bit
                    

                     When G.751 framing is
		used, bit 11 of the G.751 frame is reserved for national use and is set to 1 by
		default. 
	 
                    


                    Note
                     Configure national
		bit 1 only when required for interoperability with your telephone company. 
	 
                    

                     To set the national
		bit in the G.751 frame, use the following commands:
	 
                    


                    
				  
                     Command
				  
                    

				                    		

				  
                     Purpose
				  
                    

				                    		

                    
                    

                    
				  
                     Router# 
					 configure 
						terminal
				  
                    

				                    		

				  
                     Enters
					 global configuration mode.
				  
                    

				                    		

                    

                    
				  
                    
					 Router(config)# 
					 controller 
						{t1 
						| 
						e1} 
					 slot/subslot/port
				  
                    

				                    		

				  
                     Selects the
					 controller to configure.
				  
                    

				  
                    •  t1—Specifies the T1 controller.
					 
                      • 

                    • 
						e1—Specifies the E1 controller.
					 
                      • 

                    • 
						slot/subslot/port—Specifies the location of the controller.
					 
                      • 

                    

				                    		

                    

                    
				  
                    
					 Router(config-controller)# 
					 national 
						reserve 
						{0 
						| 
						1} 
						{0 
						| 
						1} 
						{0 
						| 
						1} 
						{0 
						| 
						1} 
						{0 
						| 
						1} 
						{0 
						| 
						1}
				  
                    

				                    		

				  
                     Sets the
					 national bit (the first bit):
				  
                    

				  
                    •  0—Sets
						the international bit in the G.704 frame to 0. This is the default. 
					 
                      • 

                    •  1—Sets
						the international bit in the G.704 frame to 1.
					 
                      • 

                    

				  
                    Note   
                
               When
					 CRC4 framing is configured, the first bit is the national bit. When no-CRC4
					 framing is configured, the first bit becomes the international bit and should
					 be set to 1 if crossing international borders and 0 if not crossing
					 international borders.
				  
                    

				  
                     Sets the
					 five national bits:
				  
                    

				  
                    •  0—Set to
						0 when not crossing international borders.
					 
                      • 

                    •  1—Set to
						1 when crossing international bordrs.
					 
                      • 

                    

				                    		

                    
                    

                    

                    

                    

                    Verifying the National Bit
                    

                    
Use the show controllers command to verify the national bits:
                    

                    router# show controllers E1
E1 6/0/0 is up.
Applique type is Channelized E1 - balanced
No alarms detected.
alarm-trigger is not set
Framing is CRC4, Line Code is HDB3, Clock Source is Line.
International Bit: 1, National Bits: 11111
Data in current interval (234 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Total Data (last 5 15 minute intervals):
0 Line Code Violations, 0 Path Code Violations,
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
                    

                    

                    

                    

                    Configuring the CRC Size for T1
                    

                    

                    
CRC is an error-checking technique that uses a calculated numeric value to detect errors in transmitted data. The 1-Port Channelized OC-3/STM-1 SPA and 1-Port Channelized OC-12/STM-4 SPA uses a 16-bit cyclic redundancy check (CRC) by default, but also supports a 32-bit CRC. The designators 16 and 32 indicate the length (in bits) of the frame check sequence (FCS). A CRC of 32 bits provides more powerful error detection, but adds overhead. Both the sender and receiver must use the same setting.
                    


                    
To set the length of the cyclic redundancy check (CRC) on a T1 interface, use these commands:
                    


                    
SUMMARY STEPS
                      1.   
      interface serial slot/subslot/port:channel-group

                      

                      2.   
      crc {16 | 32}
                      


                    DETAILED STEPS
                       Command or ActionPurpose
                      Step 1interface serial slot/subslot/port:channel-group

                       

                      Example:
                      Router(config)# interface serial 0/0/1.1/1/1/1:0
                      
 
                            		 

                      
Selects the interface to configure and enters interface configuration mode. 
                      


                      • 
slot/subslot/port:channel-group
—Specifies the location of the interface.
                        • 

                      

 
      
                      

                      Step 2crc {16 | 32}
                       

                      Example:
                      Router(config-if)# crc 16
                      
 
                            		 

                      
Selects the CRC size in bits, where:
                      


                      • 
16—16-bit CRC. This is the default.
                        • 

                      • 
32—32-bit CRC.
                        • 

                      

 
      
                      

                      

                      

                      

                      Optional Packet over SONET Configurations
                      

                      
The following sections describe how to configure optional settings on a packet over SONET (POS) interface.
                      

                      

                      Encapsulation
                      

                      

                      

                      encapsulation encapsulation-type
                      


                      

                      


                      Router(config-if)# encapsulation hdlc
                      

                      		


                      
Configures encapsulation; you can configure the following options:
                      


                      • 
HDLC
                        • 

                      • 
PPP
                        • 

                      

                      		

                      
                      

                      

                      

                      

                      

                      MTU Value
                      

                      

                      

                      mtu bytes
                      


                      

                      


                      Router(config-if)# mtu 4000

                      

                      		


                      
Configures the maximum packet size for an interface in bytes. The default packet size is 4470 bytes.
                      


                      

                      

                      		

                      
                      

                      

                      

                      

                      

                      CRC Value
                      

                      

                      

                      crc size-in-bits
                      


                      

                      


                      Router(config-if)# crc 32

                      

                      		


                      
CRC size in bits. Valid values are 16 and 32. The default is 16. 
                      

                      		

                      
                      

                      

                      

                      

                      

                      Keepalive Value
                      

                      

                      

                      keepalive [period [retries]]
                      


                      

                      


                      Router(config-if)# keepalive 9 4

                      

                      		


                      
Specifies the frequency at which the Cisco IOS software sends messages to the other end of the line to ensure that a network interface is alive, where:
                      


                      • period—Specifies the time interval in seconds for sending keepalive packets. The default is 10 seconds.
                        • 

                      • retries—Specifies the number of times that the device continues to send keepalive packets without response before bringing the interface down. The default is 3 retries.
                        • 

                      

                      		

                      
                      

                      

                      

                      

                      

                      Bandwidth
                      

                      
Use the following command to configure the bandwidth of a POS interface.
                      


                      

                      bandwidth {kbps | inherit [kbps]} 
                      

                      		


                      
To set and communicate the current bandwidth value for an interface to higher-level protocols, use the bandwidth command in interface configuration mode.Valid values are from 1 to 10000000. You can apply the following keywords:
                      


                      • inherit —Specifies how a subinterface inherits the bandwidth of its main interface. 
                        • 

                      • receive—Specifies the receive-side bandwidth.
                        • 

                      

                      		

                      
                      

                      

                      

                      

                      

                      Scrambling
                      

                      
Use the following command to enable scrambling on a POS interface.
                      


                      

                      pos scramble-atm
                      

                      		


                      
Enables scrambling on the interface.
                      

                      		

                      
                      

                      

                      

                      

                      

                      C2 Flag
                      

                      
Use the following command to configure the C2 flag on a POS interface.
                      


                      

                      pos flag c2 value
                      

                      		


                      
Specifies the C2 byte field for the interface as defined in RFC 2615. Valid values are 0-255.
                      

                      		

                      
                      

                      

                      

                      

                      

                      J1 Flag
                      

                      
Use the following command to configure the J1 flag on a POS interface.
                      


                      

                      pos flag j1 message word
                      

                      		


                      
Specifies the value of the J1 byte in the SONET Path OverHead (POH) column.
                      

                      		

                      
                      

                      

                      

                      
You can use the following commands to verify your configuration:
                      

                      • show interfaces pos
                        • 

                      

                      

                      

                      

                      

                      Managing Interface Naming
                      

                      
The following sections describe how to manage interface naming on the Cisco ASR 900 Series Router optical interface module.
                      

                      

                      Identifying Slots and Subslot
                      

                      
To specify the physical address for controller or interface configuration, use the interface and controller sonet commands, where:
                      

                      • 
slot—Specifies the chassis slot number where the interface module is installed; the slot number is always 0 for interface modules on the Cisco ASR 900 Series Router.
                        • 

                      • 
subslot—Specifies the subslot where the interface module is installed.
                        • 

                      • 
port—Specifies the SONET port number. 
                        • 

                      

                      
For example, if the optical interface module is installed in slot 0 of the chassis, the controller configuration address is specified as controller sonet 0/0/0.
                      

                      
For channelized configuration, the interface address format is: slot/subslot/port:channel-group, where:
                      

                      • 
channel-group—Specifies the logical channel group assigned to the time slots within the T1 link.
                        • 

                      

                      

                      

                      

                      Configuring Multilink Point-to-Point Protocol
                      

                      
Multilink Point-to-Point Protocol (MLPPP) allows you to combine interfaces which correspond to an entire T1 or E1 multilink bundle. You can choose the number of bundles and the number of T1 or E1 lines in each bundle in any combination of E1 and T1 member link interfaces.
                      

                      
This section describes how to configure MLPPP on the optical interface module and includes the following topics:
                      

                      

                      MLPPP Configuration Guidelines
                      

                      
When configuring MLPPP, consider the following guidelines:
                      

                      • 
Only T1 and E1 links are supported in a bundle. 
                        • 

                      • 
Enable PPP encapsulation before configuring multilink-related commands.
                        • 

                      • 
Interfaces can be grouped into the MLPPP bundle if they belong to same interface module. 
                        • 

                      • 
A group can have a maximum of 16 interfaces.
                        • 

                      • 
Maximum MTU for MLPP is 9216. For serial links that are not part of MLPPP configuration, maximum MTU varies for OC-3 and T1/E1 interfaces. The MTU range is as follows
                        • 
OC-3: 64 to 7673
                          • 

                        • 
T1/E1: 64 to 9216
                          • 

                        

                        • 

                      

                      

                      

                      Creating a Multilink Bundle
                      

                      

                      
To create a multilink bundle, use the following commands:
                      


                      
SUMMARY STEPS
                        1.   
      configure terminal
                        

                        2.   
      interface multilink group-number

                        

                        3.   
      ip address address mask
                        


                      DETAILED STEPS
                         Command or ActionPurpose
                        Step 1configure terminal
                         

                        Example:
                        Router# configure terminal
                        
 
                              		 

                        
Enters global configuration mode.
                        

 
      
                        

                        Step 2interface multilink group-number

                         

                        Example:
                        Router(config)# interface multilink 1
                        
 
                              		 

                        
Creates a multilink interface and enters multilink interface mode, where:
                        


                        • 
group-number—The group number for the multilink bundle.
                          • 

                        

 
      
                        

                        Step 3ip address address mask
                         

                        Example:
                        Router(config-if)# ip address 192.168.1.1 255.255.255.0
                        
 
                              		 

                        
Sets the IP address for the multilink group, where:
                        


                        • 
address—The IP address.
                          • 

                        • 
mask—The subnet mask.
                          • 

                        

 
      
                        

                        

                        

                        

                        Assigning an Interface to a Multilink Bundle
                        

                        

                        
To assign an interface to a multilink bundle, use the following commands:
                        


                        
SUMMARY STEPS
                          1.   
      configure terminal
                          

                          2.   
      interface serial slot/subslot/port

                          

                          3.   
      encapsulation ppp
                          

                          4.   
      ppp multilink group group-number
                          

                          5.   
      end
                          


                        DETAILED STEPS
                           Command or ActionPurpose
                          Step 1configure terminal
                           

                          Example:
                          Router# configure terminal
                          
 
                                		 

                          
Enters global configuration mode.
                          

 
      
                          

                          Step 2interface serial slot/subslot/port

                           

                          Example:
                          Router(config)# interface serial 0/0/1.1/1/1/1:0
                          
 
                                		 

                          
Selects the interface to configure and enters interface configuration mode, where:
                          


                          • 
slot/subslot/port
—Specifies the location of the controller.
                            • 

                          

 
      
                          

                          Step 3encapsulation ppp
                           

                          Example:
                          Router(config-if)# encapsulation ppp
                          
 
                                		 

                          
Enables PPP encapsulation.
                          

 
      
                          

                          Step 4ppp multilink group group-number
                           

                          Example:
                          Router(config-if)# ppp multilink group 1
                          
 
                                		 

                          
Assigns the interface to a multilink bundle, where:
                          


                          • 
group-number—The multilink group number for the T1 or E1 bundle.
                            • 

                          

 
      
                          

                          Step 5end
                           
                                		 

                          

                          

 
      
                          

                          
What to Do Next
                          


                          Note
                          
Repeat these commands for each interface you want to assign to the multilink bundle
                          


                          Router# configure terminal
Router(config)# controller SONET 0/0/0
Router(config-controller)# framing sdh
Router(config-controller)# aug mapping au-4
Router(config-controller)# au-4 1 tug-3 1
Router(config-controller)# tug-2 1 e1 1 channel-group 0 timeslots 1-31
Router# configure terminal
Router(config)# interface multilink 1
Router(config-if)# ip address 192.168.1.1 255.255.255.0
Router(config-if)# ppp multilink endpoint string string1
Router(config)# interface serial 
0/0/1.1/1/1/1:0
Router(config-if)# encapsulation ppp
Router(config-if)# ppp multilink group 1
                          


                          

                          

                          Configuring Fragmentation Size and Delay on an MLPPP Bundle
                          

                          

                          
To configure the fragmentation size on a multilink PPP bundle, use the following commands:
                          


                          
SUMMARY STEPS
                            1.   
      configure terminal
                            

                            2.   
      interface multilink group-number
                            

                            3.   
      ppp multilink fragment size fragment-size
                            

                            4.   
      ppp multilink fragment-delay delay
                            


                          DETAILED STEPS
                             Command or ActionPurpose
                            Step 1configure terminal
                             

                            Example:
                            Router# configure terminal
                            
 
                                  		 

                            
Enters global configuration mode.
                            

 
      
                            

                            Step 2interface multilink group-number
                             

                            Example:
                            Router(config)# interface multilink 1
                            
 
                                  		 

                            
Creates a multilink interface and enters multilink interface mode, where:
                            


                            • 
group-number
—The group number for the multilink bundle. Range 1-2147483647
                              • 

                            

 
      
                            

                            Step 3ppp multilink fragment size fragment-size
                             

                            Example:
                            Router(config-if)# ppp multilink fragment size 512
                            
 
                                  		 

                            
Sets the fragmentation size in bytes. Fragmentation is disabled by default. Valid values are 42 to 65535 bytes.
                            

 
      
                            

                            Step 4ppp multilink fragment-delay delay
                             

                            Example:
                            Router(config-if)# ppp multilink fragment-delay 20
                            
 
                                  		 

                            
Sets the configured delay on the multilink bundle that satisfies the fragmentation size, where:
                            


                            • 
delay
—Delay in milliseconds.
                              • 

                            

 
      
                            

                            
What to Do Next
                            

                            
The following example of the show ppp multilink command shows the MLPPP type and the fragmentation size:
                            


                            Router# 
show ppp multilink
 Multilink1, bundle name is test2Bundle up for 00:00:13Bundle is Distributed0 lost fragments, 0 reordered, 0 unassigned0 discarded, 0 lost received, 206/255 load0x0 received sequence, 0x0 sent sequence Member links: 2 active, 0 inactive (max not set, min not set)Se4/2/0/1:0, since 00:00:13, no frags rcvdSe4/2/0/2:0, since 00:00:10, no frags rcvdDistributed fragmentation on. Fragment size 512.  Multilink in Hardware.

                            


                            

                            

                            Changing the Default Endpoint Discriminator
                            

                            
To override or change the default endpoint discriminator, use the following command in interface configuration mode: 
                            


                            

                            
Command
                            

                            		


                            
Purpose
                            

                            		

                            
                            

                            

                            Router(config-if)# ppp multilink endpoint {hostname | ip IP-address
 | mac LAN-interface
 | none | phone telephone-number
 | string char-string
}
                            

                            		


                            
Overrides or changes the default endpoint discriminator the system uses when negotiating the use of MLP with the peer.
                            

                            		

                            
                            

                            

                            

                            

                            

                            Disabling Fragmentation on an MLPPP Bundle
                            

                            

                            
By default, PPP multilink fragmentation is enabled. To disable fragmentation on a multilink bundle, use the following commands:
                            


                            
SUMMARY STEPS
                              1.   
      configure terminal
                              

                              2.   
      interface multilink group-number

                              

                              3.   
      ppp multilink fragment disable
                              


                            DETAILED STEPS
                               Command or ActionPurpose
                              Step 1configure terminal
                               

                              Example:
                              Router# configure terminal
                              
 
                                    		 

                              
Enters global configuration mode.
                              

 
      
                              

                              Step 2interface multilink group-number

                               

                              Example:
                              Router(config)# interface multilink 1
                              
 
                                    		 

                              
Specifies the multilink interface and enters multilink interface mode, where:

                              


                              • group-number—The group number for the multilink bundle. Range 1-2147483647

                                • 

                              

 
      
                              

                              Step 3ppp multilink fragment disable
                               

                              Example:
                              Router(config-if)# ppp multilink fragment disable
                              
 
                                    		 

                              
Disables PPP multilink fragmentation.
                              

 
      
                              

                              

                              

                              

                              

                              Configuring BERT
                              

                              
BERT (Bit-Error Rate Testing) is used for analyzing quality and for problem resolution of digital transmission equipment. BERT tests the quality of an interface by directly comparing a pseudorandom or repetitive test pattern with an identical locally generated test pattern. 
                              

                              
The BERT operation is data-intensive. Regular data cannot flow on the path while the test is in progress. The path is reported to be in alarm state when BERT is in progress and restored to a normal state after BERT has been terminated.
                              

                              
The supported BERT patterns are 2^15, 2^23, all 0s and all 1s.
                              

                              

                              

                              Configuring Automatic Protection Switching
                              

                              
For information on how to configure Automatic Protection Switching (APS) on the optical interface module, see 
www.cisco.com/​c/​en/​us/​td/​docs/​ios-xml/​ios/​atm/​configuration/​xe-3s/​asr903/​tdm-xe-3s-asr903-book/​tdm-aps.html
Configuring Automatic Protection Switching on the Cisco ASR 900 Series Router
.
                              

                              

                              

                              Verifying Interface Configuration
                              

                              
Besides using the show running-configuration command to display your Cisco ASR 900 Series Router configuration settings, you can use the show interface serial and the show controllers sonet commands to get detailed information on a per-port basis.
                              

                              

                              Verifying Per-Port Interface Status
                              

                              
To find detailed interface information on a per-port basis on an optical interface module, use the show interface serial and show controllers sonet commands.
                              

                              
For examples of the show commands here, see the Cisco IOS Interface and Hardware Component Command Reference
.
                              

                              

                              

                              

                              Configuring TU-AIS
	 Alarms
                              

                               TU-AIS alarms are the TU-level AIS
		alarms, which are higher order alarms compared to the AIS alarms. Prior to
		Cisco IOS-XE release 3.18 SP, the PDH AIS alarms were generated when the TDM
		circuits went down. But, the SDH devices are unable to detect the PDH AIS
		alarms. Effective Cisco IOS-XE release 3.18.1 SP, TU-AIS alarms are generated
		and detected when the TDM circuits go down on the access layer of the network
		topology. To meet the standards and requirements the TU-AIS alarm feature is
		enabled on Cisco RSP1 and RSP2 modules according to TU-12 section as defined in
		ITU-G. 707 (8.3.2). TU-AIS means that all TU-12 (i.e. all 144B) carries all "1"
		according to ITU-T G.707 (6.2.4.1.3).
	 
                              

                              

                              Restrictions for
	 TU-AIS Alarms
                              

                              •  
		  
                                This alarm is only
			 applicable for SDH - E1 for unframed (SAToP) type and is not applicable for
			 FRAMED (CESoP) type. 
		  
                                
 
		
                                • 

                              •  
		  
                                The interface
			 modules reset after you enable or disable the TU-AIS alarms. 
		  
                                
 
		
                                • 

                              •  
		  
                                TU-AIS
			 configuration takes effect on all 4 ports. 
		  
                                
 
		
                                • 

                              

                              

                              

                              Configuration of
	 TU-AIS Alarms
                              

                              Use the following commands to
		configure TU-AIS alarms:
	 
                              

                              
		
                              enable
configure terminal
controller sonet 0/1/2
tu-ais
end
                              

	 
                              

                              

                              

                              Verification of
	 TU-AIS Alarm Configuration
                              

                               
		
                              Use the 
		   show run | se command to verify the
		  configuration of TU-AIS alarm:
		
                              

		
                              
		  
                              PE#show run | se SONET 0/1/2
platform enable controller SONET 0/1/2
controller SONET 0/1/2
 no ais-shut
 TU-AIS
 framing sdh
 clock source internal
 aug mapping au-4
 !
 au-4 1 tug-3 1
  mode c-12
  tug-2 1 e1 1 cem-group 555 unframed
  tug-2 1 e1 1 framing unframed
 !
 au-4 1 tug-3 2
  mode c-12
 !
 au-4 1 tug-3 3
  mode c-12
site1-PE#

                              

		
                              
 
	 
                              

                              

                              

                              

                              Troubleshooting
                              

                              
You can use the following commands to verify your configuration:
                              

                              • show cem circuit—shows information about the circuit state, administrative state, the CEM ID of the circuit, and the interface on which it is configured. If xconnect is configured under the circuit, the command output also includes information about the attached circuit.
                                • 

                              • show cem circuit 0-504—Displays the detailed information about that particular circuit.
                                • 

                              • show cem circuit summary—Displays the number of circuits which are up or down per interface basis.
                                • 

                              • show controller sonet x/y/z—Displays the alarm information.
                                • 

                              • show hw-module subslot transceiver—Displays information about the optical transceiver
                                • 

                              • show mpls l2transport vc—Displays the state of local and peer access circuits
                                • 

                              • show running configuration—Shows detail on each CEM group
                                • 

                              • show xconnect all—Displays the state of the pseudowire and local and peer access circuits
                                • 

                              • show interfaces pos—Displays all the current interface processors and their interfaces.
                                • 

                              

                              
The show controllers command output reports the following alarms:
                              

                              • 

                                • 
SLOS
                                  • 

                                • 
SLOF
                                  • 

                                • 
B1-TCA
                                  • 

                                • 
B2-TCA
                                  • 

                                

                                • 

                              

                              
When SLOS is reported, all the other alarms are masked.
                              

                              Router(config-controller)# show controller sonet 0/5/2
SONET 0/5/2 is down.
  Hardware is A900-IMA4OS
 
Applique type is Channelized Sonet/SDH
Clock Source is Line, AUG mapping is AU4.
. 
.
.
Multiplex Section:
  AIS = 6          RDI = 0          REI = 0          BIP(B2) = 0         
Active Defects: None
Detected Alarms: SLOS SLOF LAIS B1-TCA B2-TCA ......<shows all alarms reported>
Asserted/Active Alarms: SLOS B1-TCA B2-TCA..........<shows hierarchy>
Alarm reporting enabled for: SLOS SLOF SF B1-TCA B2-TCA 
BER thresholds:  SF = 10e-3  SD = 10e-6
TCA thresholds:  B1 = 10e-6  B2 = 10e-6
                              

                              
To provide information about system processes, the Cisco IOS software includes an extensive list of EXEC commands that begin with the word show, which, when executed, display detailed tables of system information. Following is a list of some of the common show commands for the APS feature.
                              

                              
To display the information described, use these commands in privileged EXEC mode.
                              


                              

                              
Command or Action
                              

                              		


                              
Purpose
                              

                              		

                              
                              

                              

                              Router# show aps
                              

                              		


                              
Displays information about the automatic protection switching feature.
                              

                              		

                              

                              

                              Router# show controller sonet slot/ port-adapter/ port
                              

                              		


                              
Displays information about the hardware.
                              

                              		

                              

                              

                              Router# show interfaces
                              

                              		


                              
Displays information about the interface.
                              

                              		

                              
                              

                              

                              

                              

                              For examples of the show commands here, see the Cisco IOS Interface and Hardware Component Command Reference.
                              

                              

                              

                              Framing and Encapsulation Configuration Example
                              

                              
The following example sets the framing and encapsulation for the controller and interface:
                              

                              ! Specify the controller and enter controller configuration mode
!
Router(config)# controller sonet 6/0/0
!
! Specify the framing method
!
Router(config-controller)# framing esf
!
! Exit controller configuration mode and return to global configuration mode
!
Router(config-controller)# exit
!
! Specify the interface and enter interface configuration mode
!
Router(config)# interface serial 6/0/0:0
!
! Specify the encapsulation protocol
!
Router(config-if)# encapsulation ppp
!
! Exit interface configuratin mode
!
Router(config-if)# exit
!
! Exit global configuration mode
!
Router(config)# exit
Router#
                              

                              

                              

                              National Bit Configuration Example
                              

                              
The following example sets the Natijonal Bits for the controller:
                              

                              ! Specify the controller and enter controller configuration mode
!
Router(config)# controller t1 6/0/0
!
! Set the national bits
!
Router(config-controller)# 
national reserve 0 1 1 1 1 1
!
! Exit controller configuration mode and return to global configuration mode
!
Router(config-controller)# exit
!
! Exit global configuration mode
!
Router(config)# exit
Router#
                              

                              

                              

                              CRC Configuration Example
                              

                              
The following example sets the CRC size for the interface:
                              

                              ! Specify the interface and enter interface configuration mode
!
Router(config)# interface serial 6/0/0:0
!
! Specify the CRC size
!
Router(config-if)# crc 32
!
! Exit interface configuration mode and return to global configuration mode
!
Router(config-if)# exit
!
! Exit global configuration mode
!
Router(config)# exit
Router#
                              

                              

                              

                              Facility Data Link Configuration Example
                              

                              
The following example configures Facility Data Link:
                              

                              ! Specify the controller and enter controller configuration mode
!
Router(config)# controller sonet 6/0/0
!
! Specify the FDL specification
!
Router(config-controller)# 
fdl ansi
!
! Exit controller configuration mode and return to global configuration mode
!
Router(config-controller)# exit
!
! Exit global configuration mode
!
Router(config)# exit
Router#
                              

                              

                              

                              MLPPP Configuration Example
                              

                              
The following example creates a PPP Multilink bundle:
                              

                              ! Enter global configuration mode
!
Router# configure terminal
!
! Create a multilink bundle and assign a group number to the bundle
!
Router(config)# interface multilink 1
!
! Specify an IP address for the multilink group
!
Router(config-if)# ip address 123.456.789.111 255.255.255.0
!
! Enable Multilink PPP
!
Router(config-if)# ppp multilink
!
! Leave interface multilink configuration mode
!
Router(config-if)# exit
!
! Specify the interface to assign to the multilink bundle
!
Router(config)# interface serial 3/1//0:1
!
! Enable PPP encapsulation on the interface
!
Router(config-if)# encapsulation PPP
!
! Assign the interface to a multilink bundle
!
Router(config-if)# multilink-group 1
!
! Enable Multilink PPP
!
Router(config-if)# ppp multilink
!
! Exit interface configuration mode
!
Router(config-if)# exit
!
! Exit global configuration mode
!
Router(config)# exit
Router#
                              

                              

                              

                              MFR Configuration Example
                              

                              
The following example configures Multilink Frame Relay (MFR):
                              

                              ! Create a MFR interface and enter interface configuration mode
!
Router(config)# interface mfr 49
!
! Assign the bundle identification (BID) name ‘test’ to a multilink bundle.
!
Router(config-if)# frame-relay multilink bid test
!
! Exit interface configuration mode and return to global configuration mode
!
Router(config-if)# exit
!
! Specify the serial interface to assign to a multilink bundle
!
Router(config)# interface serial 5/1/3:0
!
! Creates a multilink Frame Relay bundle link and associates the link with a multilink bundle
!
Router(config-if)# 
encapsulation frame-relay mfr 49
!
! Assigns a bundle link identification (LID) name with a multilink bundle link
!
Router(config-if)# 
frame-relay multilink lid test
!
! Configures the interval at which the interface will send out hello messages
!
Router(config-if)# frame-relay multilink hello 15
!
! Configures the number of seconds the interface will wait for a hello message acknowledgement before resending the hello message
!
Router(config-if)# frame-relay multilink ack 6
!
! Configures the maximum number of times the interface will resend a hello message while waiting for an acknowledgement
!
Router(config-if)# frame-relay multilink retry 5
!
! Exit interface configuration mode and return to global configuration mode
!
Router(config-if)# exit
!
! Exit global configuration mode
!
                              

                              
Router(config)# exit
                              

                              

                              

                              

                              Configuration Examples
                              

                              
This section includes the following configuration examples:
                              

                              

                              Example of Cyclic Redundancy Check Configuration 
                              

                              
The following example configures CRC on a T1 interface:
                              

                              ! Specify the interface to configure and enter interface configuration mode.
!
Router(config)# interface serial 2/0/0.1
!
! Specify the CRC type.
!
Router(config-if)# crc 32

                              

                              

                              

                              Example of Facility Data Link Configuration
                              

                              
The following example configures FDL on a T1 interface:
                              

                              ! Specify the interface to configure and enter interface configuration mode.
!
Router(config)# interface serial 1/0/0.2
!
! Specify the T1 number and select fdl.
!
Router(config-controller)#t1 2 fdl ansi

                              

                              

                              

                              Example of Invert Data on T1/E1 Interface 
                              

                              
The following example inverts the data on the serial interface:
                              

                              ! Specify the interface to configure and enter interface configuration mode.
!
Router(config)# interface serial 3/0/0.1/2/1:0
!
! Configure invert data.
!
Router(config-if)# invert data

                              

                              

                              

                              

                              Additional Resources
                              

                              
For more information about configuring ATM, see
                              


                              
For additional information on configuring optical interfaces, see