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Cisco 7600 Series Router SIP, SSC, and SPA Software Configuration Guide

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Updated:
May 7, 2015

Chapter: Configuring the 2-Port and 4-Port Channelized T3 SPAs

Configuring the 2-Port and 4-Port Channelized T3 SPAs

This chapter provides information about configuring the 2-Port and 4-Port Channelized T3 Shared Port Adapters (SPAs) on the Cisco 7600 series router. It includes the following sections:

For information about managing your system images and configuration files, refer to the Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 and Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 publications.

For more information about the commands used in this chapter, refer to the Cisco IOS Software Releases 15.0SR Command References and to the Cisco IOS Software Releases 12.2SX Command References. Also refer to the related Cisco IOS Release 12.2 software command reference and master index publications. For more information, see the “$paratext>” section.

Configuration Tasks

This section describes how to configure the serial SPAs for the Cisco 7600 series router and includes information about verifying the configuration.

It includes the following topics:

Required Configuration Tasks

This section lists the required configuration steps to configure the 2-Port and 4-Port Channelized T3 SPA. Some of the required configuration commands implement default values that might be appropriate for your network.

Note To better understand the address format used to specify the physical location of the SPA Interface Processor (SIP), SPA, and interfaces, see the section Specifying the Interface Address on a SPA.

Configuring the T3 Controller

To configure the T3 controller for the 2-Port and 4-Port Channelized T3 SPA, complete these steps:

 

Command
Purpose

Step 1

Router# configure terminal

Enters global configuration mode.

Step 2

Router(config)# controller t3 slot/subslot/port

Selects the controller to configure and enters controller configuration mode.

Step 3

Router(config-controller)# [no] channelized

(Optional) Specifies the channelization mode.

  • channelized—In channelized mode, the T3 link can be channelized into 28 T1s, and each T1 can be further channelized into 24 DS0s. This is the default.
  • no channelized—In the unchannelized mode the T3 link provides a single high-speed data channel of 44210 kbps.

Step 4

Router(config-controller)# framing {auto-detect | c-bit | m23}

(Optional) Specifies the framing type in channelized mode.

  • auto-detect—Detects the framing type at the device at the end of the line and switches to that framing type. If both devices are set to auto-detect, c-bit framing is used.
  • c-bit—Specifies C-bit parity framing. This is the default.
  • m23—Specifies M23 framing.

Note To set the framing type for an un-channelized T3, see: “Configuring T3 Framing” section.

Step 5

Router(config-controller)# clock source {internal | line}

(Optional) Specifies the clock source.

  • internal—Specifies that the internal clock source is used. Default for channelized mode.
  • line—Specifies that the network clock source is used. Default for un-channelized mode.

Step 6

Router(config-controller)# cablelength {0 - 450}

(Optional) Specifies the cable length. The default is 224 ft.

  • 0-450—Cable length in feet.

Configuring the Logical T1 Interfaces

If channelized mode is configured for the T3 controller, use the following procedure to configure the logical T1 interfaces.

 

Command
Purpose

Step 1

Router# configure terminal

Enters global configuration mode.

Step 2

Router(config)# controller t3 slot/subslot/port

Selects the controller to configure and enters controller configuration mode.

Step 3

Router(config-controller)# t1 t1-number channel-group channel-number timeslots range [speed {56 | 64}]

Specifies the T1 channel and timeslots to be mapped to each channel.

  • t1-number—T1 number from 1–28.
  • channel-number—Specifies a channel-group mapping(0–23) under the designated T1.
  • range—List of timeslots under the channel-group. Timeslots assigned to this T1 can be 1–24 or a combination of subranges within 1– 24. You can indicate a range using a hyphen, commas, or a combination of both. One timeslot equals one DS0.
  • speed 56 or 64— Specifies the speed of a timeslot as either 56 or 64 kbps. The default speed of 64 kbps is not mentioned in the config.

Step 4

Router(config-controller)# t1 t1-number framing {esf | sf [hdlc-idle {0x7e | 0xff}] [mode {j1}]}

(Optional) Specifies the T1 framing type using the framing command.

  • sf—Specifies Super Frame as the T1 frame type.

Note If you select sf framing, you should consider disabling yellow alarm detection because the yellow alarm can be incorrectly detected with sf framing.

  • esf—Specifies Extended Super Frame as the T1 frame type. This is the default.
  • hdlc-idle— The hdlc-idle option allows you to set the idle pattern for the T1 interface to either 0x7e (the default) or 0xff.

Step 5

Router(config-controller)# t1 channel-number clock source {internal | line}

(Optional) Specifies the T1 clock source.

  • internal—Specifies that the internal clock source is used. This is the default.
  • line—Specifies that the network clock source is used.

Step 6

Configure the serial interfaces.

Note After a T1 channel is configured, it appears to the Cisco IOS software as a serial interface; therefore, all the configuration commands for a serial interface are available. However, not all commands are applicable to the T1 interface. All the encapsulation formats, such as PPP, HDLC, and Frame Relay are applicable to the configured T1. Encapsulation can be set via the serial interface configuration commands.

For detailed interface configuration information, see the Cisco IOS Interface Configuration Guide, Release 12.2 at: http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_configuration_guide_book09186a0080087098.html

Verifying T3 Controller Configuration

Use the show controllers command to verify the controller configuration:

Router# show controllers t3
T3 3/1/0 is administratively down.
T3 3/1/1 is administratively down.
T3 3/1/2 is up. Hardware is 4 ports CT3 SPA
ATLAS FPGA version: 0, FREEDM336 version: 0
TEMUX84(1) version: 0, TEMUX84(1) version: 0
SUBRATE FPGA version: 0
Applique type is Channelized T3
No alarms detected.
Framing is M23, Line Code is B3ZS, Clock Source is Internal
Equipment customer loopback
Data in current interval (746 seconds elapsed):
0 Line Code Violations, 0 P-bit Coding Violation
0 C-bit Coding Violation, 0 P-bit Err Secs
0 P-bit Severely Err Secs, 0 Severely Err Framing Secs
0 Unavailable Secs, 0 Line Errored Secs
0 C-bit Errored Secs, 0 C-bit Severely Errored Secs
0 Severely Errored Line Secs
0 Far-End Errored Secs, 0 Far-End Severely Errored Secs
0 CP-bit Far-end Unavailable Secs
0 Near-end path failures, 0 Far-end path failures
0 Far-end code violations, 0 FERF Defect Secs
0 AIS Defect Secs, 0 LOS Defect Secs
 
T1 1 is up
timeslots: 1-24
FDL per AT&T 54016 spec.
No alarms detected.
Framing is ESF, Clock Source is Internal
Data in current interval (177 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, 0 Stuffed Secs
0 Near-end path failures, 0 Far-end path failures, 0 SEF/AIS Secs
Total Data (last 2 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, 0 Stuffed Secs
0 Near-end path failures, 0 Far-end path failures, 0 SEF/AIS Secs
 
T1 2
Not configured.
 
T1 3
Not configured.
.
.
.
T3 3/1/3 is up. Hardware is 4 ports CT3 SPA
ATLAS FPGA version: 0, FREEDM336 version: 0
TEMUX84(1) version: 0, TEMUX84(1) version: 0
SUBRATE FPGA version: 0
Applique type is Subrate T3
No alarms detected.
MDL transmission is disabled
FEAC code received: No code is being received
Framing is C-BIT Parity, Line Code is B3ZS, Clock Source is Line
Equipment customer loopback
Data in current interval (657 seconds elapsed):
0 Line Code Violations, 0 P-bit Coding Violation
0 C-bit Coding Violation, 0 P-bit Err Secs
0 P-bit Severely Err Secs, 0 Severely Err Framing Secs
0 Unavailable Secs, 0 Line Errored Secs
0 C-bit Errored Secs, 0 C-bit Severely Errored Secs
0 Severely Errored Line Secs
0 Far-End Errored Secs, 0 Far-End Severely Errored Secs
0 CP-bit Far-end Unavailable Secs
0 Near-end path failures, 0 Far-end path failures
0 Far-end code violations, 0 FERF Defect Secs
0 AIS Defect Secs, 0 LOS Defect Secs

Verifying Interface Configuration

Use the show interface serial command to verify the interface configuration. The following example shows the ouput for the serial interface for an un-channelized T3:

Router# show interface serial3/0/0
Serial3/0/0 is down, line protocol is down
Hardware is Channelized/ClearChannel CT3 SPA
MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, loopback not set
Keepalive set (10 sec)
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicast)
0 runts, 0 giants, 0 throttles
0 parity
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 applique, 2 interface resets
0 output buffer failures, 0 output buffers swapped out
1 carrier transitions alarm present
DSU mode 0, bandwidth 44210 Kbit, scramble 0, VC 0
 

The following example shows the output for a serial interface for the first T1 on a channelized T3:

Router# show interface serial3/0/1/1:0
Serial3/0/1/1:0 is administratively down, line protocol is down
Hardware is Channelized/ClearChannel CT3 SPA
MTU 1500 bytes, BW 832 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, loopback not set
Keepalive set (10 sec)
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicast)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions alarm present
VC 1: timeslot(s): 2-14, Transmitter delay 0, non-inverted data

Specifying the Interface Address on a SPA

SPA interface ports begin numbering with “0” from left to right. Single-port SPAs use only the port number 0. To configure or monitor SPA interfaces, you need to specify the physical location of the SIP, SPA, and interface in the CLI. The interface address format is slot / subslot / port, where:

  • slot —Specifies the chassis slot number in the Cisco 7600 series router where the SIP is installed.
  • subslot —Specifies the secondary slot of the SIP where the SPA is installed.
  • port —Specifies the number of the individual interface port on a SPA.

The following example shows how to specify the first interface (0) on a SPA installed in the first subslot of a SIP (0) installed in chassis slot 3:

Router(config)# interface serial 3/0/0
 

This command shows a serial SPA as a representative example, however the same slot / subslot / port format is similarly used for other SPAs (such as ATM and POS) and other non-channelized SPAs.

For the 4-Port Channelized T3 SPA, the interface address format is slot/subslot/port/t1-number : channel-group, where:

  • t1-number—Specifies the logical T1 number in channelized mode.
  • channel-group—Specifies the logical channel group assigned to the timeslots within the T1 link.

For more information about identifying slots and subslots, see the “Identifying Slots and Subslots for SIPs, SSCs, and SPAs” section.

Optional Configurations

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

Configuring the Data Service Unit Mode

Configure the SPA to connect with customer premise Data Service Units (DSUs) by setting the DSU mode. Subrating a T3 or E3 interface reduces the peak access rate by limiting the data transfer rate. To configure the Data Service Unit (DSU) mode, use the following commands.

z

Command
Purpose

Step 1

Router# configure terminal

Enters global configuration mode.

Step 2

Router(config)# interface serial slot/subslot/port

Selects the controller to configure and enters controller configuration mode.

Step 3

Router(config-if)# dsu mode {0 | 1 | 2 | 3 | 4}

Specifies the interoperability mode used by the T3 controller.

  • 0—Connects a T3 controller to another T3 controller or to a Digital Link DSU. Bandwidth range is from 300 to 44210 kbps. This is the default.
  • 1—Connects a T3 controller to a Kentrox DSU. Bandwidth range is from 1500 to 35000, or 44210 kbps.

Note If the bandwidth is set between 35000–44210 kbps, an error message is displayed.

  • 2—Connects a T3 controller to a Larscom DSU. Bandwidth range is from 3100 to 44210 kbps.
  • 3—Connects a T3 controller to an Adtran T3SU 300. Bandwidth range is from 75 to 44210 kbps.
  • 4—Connects a T3 controller to a Verilink HDM 2182. Bandwidth range is from 1500 to 44210 kbps.

Step 4

Router(config-if)# dsu bandwidth kbps

Specifies the maximum allowable bandwidth.

  • kbps—Bandwidth range is from 1 to 44210 kbps.

Verifying DSU Mode

Use the show controllers serial command to display the DSU mode of the controller:

Router# show controllers serial
Serial3/1/0 -
Framing is c-bit, Clock Source is Internal
Bandwidth limit is 44210, DSU mode 0, Cable length is 10
rx FEBE since last clear counter 0, since reset 0
Data in current interval (0 seconds elapsed):
0 Line Code Violations, 0 P-bit Coding Violation
0 C-bit Coding Violation
0 P-bit Err Secs, 0 P-bit Sev Err Secs
0 Sev Err Framing Secs, 0 Unavailable Secs
0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
0 Severely Errored Line Secs
0 Far-End Errored Secs, 0 Far-End Severely Errored Secs
0 CP-bit Far-end Unavailable Secs
0 Near-end path failures, 0 Far-end path failures
0 Far-end code violations, 0 FERF Defect Secs
0 AIS Defect Secs, 0 LOS Defect Secs
 
Transmitter is sending AIS.
.
.
.

Configuring Maintenance Data Link

MDL messages are used to communicate identification information between local and remote ports. The type of information included in MDL messages includes the equipment identification code (EIC), location identification code (LIC), frame identification code (FIC), unit, Path Facility Identification (PFI), port number, and Generator Identification numbers. To configure Maintenance Data Link (MDL), use the following commands:

 

Command
Purpose

Router# configure terminal

Enters global configuration mode.

Router(config)# controller t3 slot/subslot/port

Selects the controller to configure and enters controller configuration mode.

Router(config-controller)# mdl [string {eic | fic | generator | lic | pfi | port | unit} string}] | [transmit {idle-signal | path | test-signal}]

Configures the MDL message.

  • string eic—Specifies the Equipment Identification Code; can be up to 10 characters.
  • string fic—Specifies the Frame Identification Code; can be up to 10 characters.
  • string generator—Specifies the Generator number string sent in the MDL Test Signal message; can be up to 38 characters.
  • string lic— Specifies the Location Identification Code; can be up to 11 characters.
  • string pfi—Specifies the Path Facility Identification Code sent in the MDL Path message; can be up to 38 characters.
  • string port—Specifies the Port number string sent in the MDL Idle Signal message; can be up to 38 characters.
  • string unit—Specifies the Unit Identification Code; can be up to 6 characters.
  • transmit idle-signal—Enable MDL Idle-Signal message transmission
  • transmit path—Enable MDL Path message transmission.
  • transmit test-signal—Enable MDL Test-Signal message transmission.

Verifying MDL

Use the show controller command to display the MDL settings:

Router# show controller t3 3/0/0
T3 3/0/0 is down. Hardware is 2 ports CT3 SPA
ATLAS FPGA version: 0, FREEDM336 version: 0
TEMUX84(1) version: 0, TEMUX84(1) version: 0
SUBRATE FPGA version: 0
Applique type is Subrate T3
Receiver has loss of signal.
MDL transmission is enabled
EIC: new, LIC: US, FIC: 23, UNIT: myunit
Path FI: test pfi
Idle Signal PORT_NO: New-port
Test Signal GEN_NO: test-message
FEAC code received: No code is being received
Framing is C-BIT Parity, Line Code is B3ZS, Clock Source is Line
Equipment customer loopback
Data in current interval (869 seconds elapsed):
0 Line Code Violations, 0 P-bit Coding Violation
0 C-bit Coding Violation, 0 P-bit Err Secs
0 P-bit Severely Err Secs, 0 Severely Err Framing Secs
869 Unavailable Secs, 0 Line Errored Secs
0 C-bit Errored Secs, 0 C-bit Severely Errored Secs
0 Severely Errored Line Secs
0 Far-End Errored Secs, 0 Far-End Severely Errored Secs
869 CP-bit Far-end Unavailable Secs
0 Near-end path failures, 0 Far-end path failures
0 Far-end code violations, 0 FERF Defect Secs
0 AIS Defect Secs, 870 LOS Defect Secs

Configuring Encapsulation

When traffic crosses a WAN link, the connection needs a Layer 2 protocol to encapsulate traffic. To set the encapsulation method, use the following commands:

 

Command
Purpose

Router# configure terminal

Enters global configuration mode.

Channelized

Router(config)# interface serial slot/subslot/port/t1-number:channel-group

Un-channelized

Router(config)# interface serial slot/subslot/port

Selects the interface to configure and enters interface configuration mode.

  • Channelized:

slot/subslot/port/t1-number:channel-group—Specifies the location of the interface. See: Specifying the Interface Address on a SPA

  • Un-channelized:

slot/subslot/port—Specifies the location of the interface. See: Specifying the Interface Address on a SPA

Router(config-if)# encapsulation {hdlc | ppp | frame-relay}

Set the encapsulation method on the interface.

  • hdlc—High-Level Data Link Control (HDLC) protocol for serial interface. This is the default.
  • ppp—Point-to-Point Protocol (PPP) (for serial interface).
  • frame-relay—Frame Relay (for serial interface).

Verifying Encapsulation

Use the show interface serial command to display the encapsulation method:

Router# show interface serial3/0/0
Serial3/0/0 is down, line protocol is down
Hardware is Channelized/ClearChannel CT3 SPA
MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, loopback not set
Keepalive set (10 sec)
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicast)
0 runts, 0 giants, 0 throttles
0 parity
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 applique, 2 interface resets
0 output buffer failures, 0 output buffers swapped out
1 carrier transitions alarm present
DSU mode 0, bandwidth 44210 Kbit, scramble 0, VC 0

Configuring T3 Framing

To set the T3 framing type, use the following commands:

 

Command
Purpose

Router# configure terminal

Enters global configuration mode.

Router(config)# interface serial slot/subslot/port

Selects the interface to configure and enters interface configuration mode.

Router(config-if)# framing {c-bit | m13}

Specifies the framing type in unchannelized mode.

  • c-bit—Specifies C-bit parity framing. This is the default.
  • m13—Specifies DS3 Framing M13 (same as M23).

Verifying Framing

Use the show controller command to display the framing type:

Router# show controller t3 3/0/0
T3 3/0/0 is down. Hardware is 2 ports CT3 SPA
ATLAS FPGA version: 0, FREEDM336 version: 0
TEMUX84(1) version: 0, TEMUX84(1) version: 0
SUBRATE FPGA version: 0
Applique type is Subrate T3
Receiver has loss of signal.
Framing is M13, Line Code is B3ZS, Clock Source is Line
Equipment customer loopback
Data in current interval (656 seconds elapsed):
0 Line Code Violations, 0 P-bit Coding Violation
0 C-bit Coding Violation, 0 P-bit Err Secs
0 P-bit Severely Err Secs, 0 Severely Err Framing Secs
666 Unavailable Secs, 0 Line Errored Secs
0 C-bit Errored Secs, 0 C-bit Severely Errored Secs
0 Severely Errored Line Secs
0 Far-End Errored Secs, 0 Far-End Severely Errored Secs
0 CP-bit Far-end Unavailable Secs
0 Near-end path failures, 0 Far-end path failures
0 Far-end code violations, 0 FERF Defect Secs
0 AIS Defect Secs, 666 LOS Defect Secs

Configuring FDL

Facility Data Link (FDL) is a far-end performance reporting tool. In ansi mode, you can enable 1-second transmissions of performance reports on both ends of the T1 connection. To configure FDL, use the following commands:

 

Command
Purpose

Router# configure terminal

Enters global configuration mode.

Router(config)# controller t3 slot/subslot/port

Selects the controller to configure and enters controller configuration mode.

Router(config-controller)# t1 number fdl {ansi}

(Optional) Enables FDL.

  • number—Specifies the T1 channel number.
  • ansi—Specifies the FDL bit per the ANSI T1.403 specification.

Verifying FDL

Use the show controller command to display the FDL setting:

Router# show controller t3 3/0/1/1
T3 3/0/1 is down. Hardware is 2 ports CT3 SPA
ATLAS FPGA version: 0, FREEDM336 version: 0
TEMUX84(1) version: 0, TEMUX84(1) version: 0
SUBRATE FPGA version: 0
Applique type is Channelized T3
Receiver has loss of signal.
Framing is M23, Line Code is B3ZS, Clock Source is Internal
Equipment customer loopback
Data in current interval (456 seconds elapsed):
0 Line Code Violations, 0 P-bit Coding Violation
0 C-bit Coding Violation, 0 P-bit Err Secs
0 P-bit Severely Err Secs, 0 Severely Err Framing Secs
456 Unavailable Secs, 0 Line Errored Secs
0 C-bit Errored Secs, 0 C-bit Severely Errored Secs
0 Severely Errored Line Secs
0 Far-End Errored Secs, 0 Far-End Severely Errored Secs
0 CP-bit Far-end Unavailable Secs
0 Near-end path failures, 0 Far-end path failures
0 Far-end code violations, 0 FERF Defect Secs
0 AIS Defect Secs, 456 LOS Defect Secs
 
T1 1 is down
timeslots: 2-14
FDL per ANSI T1.403 and AT&T 54016 spec.
Configured for FDL remotely line looped (bell)
Transmitter is sending LOF Indication.
Receiver is getting AIS.
Framing is ESF, Clock Source is Line
BERT running on timeslots 2,3,4,5,6,7,8,9,10,11,12,13,14,
BERT test result (running)
Test Pattern : All 1's, Status : Not Sync, Sync Detected : 0
Interval : 2 minute(s), Time Remain : 2 minute(s)
Bit Errors (since BERT started): 0 bits,
Bits Received (since BERT started): 0 Kbits
Bit Errors (since last sync): 0 bits
Bits Received (since last sync): 0 Kbits
Data in current interval (703 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
713 Unavail Secs, 0 Stuffed Secs
357 Near-end path failures, 0 Far-end path failures, 0 SEF/AIS Secs

Configuring Scramble

T3 scrambling is used to assist clock recovery on the receiving end. Scrambling is designed to randomize the pattern of 1s and 0s carried in the physical layer frame. Randomizing the digital bits can prevent continuous, nonvariable bit patterns—in other words, long strings of all 1s or all 0s. Several physical layer protocols rely on transitions between 1s and 0s to maintain clocking.

Scrambling can prevent some bit patterns from being mistakenly interpreted as alarms by switches placed between the Data Service Units (DSUs).

To configure scrambling, use the following commands:

 

Command
Purpose

Router# configure terminal

Enters global configuration mode.

Router(config)# interface serial slot/subslot/port

Selects the interface to configure and enters interface configuration mode.

Router(config-if)# scramble [0 | 1]

Enables scrambling. Scrambling is disabled by default.

  • Scramble settings:

1—enabled
0—disabled

Verifying Scrambling

Use the show interface serial command to display the scramble setting:

Router# show interface serial3/0/0
Serial3/0/0 is down, line protocol is down
Hardware is Channelized/ClearChannel CT3 SPA
MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, loopback not set
Keepalive set (10 sec)
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicast)
0 runts, 0 giants, 0 throttles
0 parity
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 applique, 4 interface resets
0 output buffer failures, 0 output buffers swapped out
1 carrier transitions alarm present
DSU mode 0, bandwidth 44210 Kbit, scramble 1, VC 0

Configuring Multilink Point-to-Point Protocol (Hardware-based)

Multilink Point to Point Protocol (MLPPP) allows you to combine T1 or E1 lines into a bundle that has the combined bandwidth of multiple T1/E1 lines. You choose the number of bundles and the number of T1 or E1 lines in each bundle.

MLPPP for T1/E1 Configuration Guidelines

The required conditions are:

  • Only T1 or E1 links in a bundle
  • All links on the same SPA
  • Maximum of 12 links in a bundle.

Note Some notes about hardware-based MLPPP:

Only 3 fragmentation sizes are possible 128, 256 and 512 bytes

Fragmentation is enabled by default, default size is 512 bytes

Fragmentation size is configured using the ppp multilink fragment-delay command after using the interface multilink command. The least of the fragmentation sizes (among the 3 sizes possible) satisfying the delay criteria is configured. (e.g., a 192 byte packet causes a delay of 1 millisecond on a T1 link, so the nearest fragmentation size is 128 bytes.

The show ppp multilink command will indicate the mlppp type and the fragmentation size:

Router# show ppp multilink
Multilink1, bundle name is Patriot2
Bundle up for 00:00:13
Bundle is Distributed
0 lost fragments, 0 reordered, 0 unassigned
0 discarded, 0 lost received, 206/255 load
0x0 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 rcvd
Se4/2/0/2:0, since 00:00:10, no frags rcvd
Distributed fragmentation on. Fragment size 512. Multilink in Hardware.

Fragmentation is disabled explicitly by using the no ppp multilink fragmentation command after using the interface multilink command.

Create a Multilink Bundle

To create a multilink bundle, use the following commands:

 

Command
Purpose

Router# configure terminal

Enters global configuration mode.

Router(config)# interface multilink group-number

Creates a multilink interface and enter multilink interface mode.

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

Router(config-if)# ip address address mask

Sets the IP address for the multilink group.

  • address—The IP address.
  • mask—The IP netmask.

Assign an interface to a Multilink Bundle

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

 

Command
Purpose

Router# configure terminal

Enters global configuration mode.

Router(config)# interface serial slot/ subslot/port/t1-number:channel-group

Selects the interface to configure and enters interface configuration mode. See: “Specifying the Interface Address on a SPA” section

  • slot/ subslot/port/t1-number:channel-group—Select the interface to configure.

Router(config-if)# encapsulation ppp

Enables PPP encapsulation.

Router(config-if)# multilink-group group-number

Assigns the interface to a multilink bundle.

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

Router(config-if)# ppp m ultilink

Enables multilink PPP on the interface.

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

 

Configuring fragmentation size on an MLPPP Bundle (optional)

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

 

Command
Purpose

Router# configure terminal

Enters global configuration mode.

Router(config)# interface multilink slot/ subslot/port/t1-number:channel-group

Creates a multilink interface and enters multilink interface mode.

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

Router(config-if)# ppp multilink fragment-delay delay

Sets the fragmentation size satisfying the configured delay on the multilink bundle.

  • delay—delay in milliseconds

Disabling the fragmentation on an MLPPP Bundle (optional)

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

 

Command
Purpose

Router# configure terminal

Enters global configuration mode.

Router(config)# interface multilink group-number

Creates a multilink interface and enters multilink interface mode.

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

Router(config-if)# no ppp multilink fragmentation

Disables the fragmentation on the multilink bundle.

Verifying Multilink PPP

Use the show ppp multilink command to verify the PPP multilinks:

router# show ppp multilink
Multilink1, bundle name is mybundle
Bundle up for 01:40:50
Bundle is Distributed
0 lost fragments, 0 reordered, 0 unassigned
0 discarded, 0 lost received, 1/255 load
0x0 received sequence, 0x0 sent sequence
Member links: 5 active, 0 inactive (max not set, min not set)
Se6/0/0/1:0, since 01:40:50, no frags rcvd
Se6/0/1/1:0, since 01:40:09, no frags rcvd
Se6/0/3/1:0, since 01:15:44, no frags rcvd
Se6/0/4/1:0, since 01:03:17, no frags rcvd
Se6/0/6/1:0, since 01:01:06, no frags rcvd
Se6/0/6:0, since 01:01:06, no frags rcvd

.Configuring MLFR for T1/E1

Multilink Frame Relay (MLFR) allows you to combine T1/E1 lines into a bundle that has the combined bandwidth of multiple T1/E1 lines. You choose the number of bundles and the number of T1/E1 lines in each bundle. This allows you to increase the bandwidth of your network links beyond that of a single T1/E1 line.

MLFR for T1/E1 Configuration Guidelines

MLFR will function in hardware if all of the following conditions are met:

  • Only T1 or E1 member links
  • All links are on the same SPA
  • Maximum of 12 links in a bundle

Create a Multilink Bundle

To create a multilink bundle, use the following commands:

 

Command
Purpose

Router# configure terminal

Enters global configuration mode.

Router(config)# interface mfr number

Configures a multilink Frame Relay bundle interface.

  • number—The number for the Frame Relay bundle.

Router(config-if)# frame-relay multilink bid name

(Optional) Assigns a bundle identification name to a multilink Frame Relay bundle.

  • name—The name for the Frame Relay bundle.

Note The bundle identification (BID) will not go into effect until the interface has gone from the down state to the up state. One way to bring the interface down and back up again is by using the shut and no shut commands in interface configuration mode.

Assign an Interface to a Multilink Bundle

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

 

Command
Purpose

Router# configure terminal

Enters global configuration mode.

Router(config)# interface serial slot/ subslot/port:channel-group

Selects the interface to assign.

Router(config-if)# encapsulation frame-relay mfr number [name]

Creates a multilink Frame Relay bundle link and associates the link with a bundle.

  • number—The number for the Frame Relay bundle.
  • name—The name for the Frame Relay bundle.

Router(config-if)# frame-relay multilink lid name

(Optional) Assigns a bundle link identification name with a multilink Frame Relay bundle link.

  • name—The name for the Frame Relay bundle.

Note The bundle link identification (LID) will not go into effect until the interface has gone from the down state to the up state. One way to bring the interface down and back up again is by using the shut and no shut commands in interface configuration mode.

Router(config-if)# frame-relay multilink hello seconds

(Optional) Configures the interval at which a bundle link will send out hello messages. The default value is 10 seconds.

  • seconds—Number of seconds between hello messages sent out over the multilink bundle.

Router(config-if)# frame-relay multilink ack seconds

(Optional) Configures the number of seconds that a bundle link will wait for a hello message acknowledgment before resending the hello message. The default value is 4 seconds.

  • seconds—Number of seconds a bundle link will wait for a hello message acknowledgment before resending the hello message.

Router(config-if)# frame-relay multilink retry number

(Optional) Configures the maximum number of times a bundle link will resend a hello message while waiting for an acknowledgment. The default value is 2 tries.

  • number—Maximum number of times a bundle link will resend a hello message while waiting for an acknowledgment.

Verifying Multilink Frame Relay

Use the show frame-relay multilink detailed command to verify the Frame Relay multilinks:

Router# show frame-relay multilink detailed
Bundle: MFR49, State = down, class = A, fragmentation disabled
BID = MFR49
No. of bundle links = 1, Peer's bundle-id =
Bundle links:
 
Serial6/0/0:0, HW state = up, link state = Add_sent, LID = test
Cause code = none, Ack timer = 4, Hello timer = 10,
Max retry count = 2, Current count = 0,
Peer LID =, RTT = 0 ms
Statistics:
Add_link sent = 21, Add_link rcv'd = 0,
Add_link ack sent = 0, Add_link ack rcv'd = 0,
Add_link rej sent = 0, Add_link rej rcv'd = 0,
Remove_link sent = 0, Remove_link rcv'd = 0,
Remove_link_ack sent = 0, Remove_link_ack rcv'd = 0,
Hello sent = 0, Hello rcv'd = 0,
Hello_ack sent = 0, Hello_ack rcv'd = 0,
outgoing pak dropped = 0, incoming pak dropped = 0

Configuring Multipoint Bridging

Multipoint bridging (MPB) enables the connection of multiple ATM PVCs, Frame Relay PVCs, BCP ports, and WAN Gigabit Ethernet subinterfaces into a single broadcast domain (virtual LAN), together with the LAN ports on that VLAN. This enables service providers to add support for Ethernet-based Layer 2 services to the proven technology of their existing ATM and Frame Relay legacy networks. Customers can then use their current VLAN-based networks over the ATM or Frame Relay cloud. This also allows service providers to gradually update their core networks to the latest Gigabit Ethernet optical technologies, while still supporting their existing customer base.

For MPB configuration guidelines and restrictions and feature compatibility tables, see the “Configuring Multipoint Bridging” section of Chapter5, “Configuring the SIPs and SSC”

Configuring Bridging Control Protocol Support

The Bridging Control Protocol (BCP) enables forwarding of Ethernet frames over SONET networks and provides a high-speed extension of enterprise LAN backbone traffic through a metropolitan area. The implementation of BCP on the SPAs includes support for IEEE 802.1D, IEEE 802.1Q Virtual LAN (VLAN), and high-speed switched LANs.

For BCP configuration guidelines and restrictions and feature compatibility tables, see the “BCP Feature Compatibility” section of Chapter5, “Configuring the SIPs and SSC”

Configuring BCP on MLPPP

BCP on MLPPP Configuration Guidelines

  • Only Distributed MLPPP is supported
  • Only channelized interfaces allowed, and member links must be from the same controller card
  • Only trunk port BCP is supported on MLPPP
  • Bridging can be configured only on the bundle interface

Note BCP on MLPPP operates only in trunk mode.

Note When you manually configure the MTU and MRRU values on the bundle interface with BCP on dMLPPP, you should set the MRRU value to atleast 20 bytes more than the MTU value. This configuration ensures that the packets wth size up to the configured MTU value on the multilink interface are not dropped because of the MRRU restrictions.

Configuring BCP on MLPPP Trunk Mode

To configure BCP on MLPPP trunk mode, perform these steps:

 

Command
Purpose

Step 1

Router(config)# interface multilink

Selects the multilink interface.

Step 2

Router(config-if)# switchport

Puts an interface that is in Layer 3 mode into Layer 2 mode for Layer 2 configuration.

Step 3

Router(config-if)# switchport trunk allowed vlan 100

By default, no VLANs are allowed. Use this command to explicitly allow VLANs; valid values for vlan-list are from 1 to 4094.

Step 4

Router(config-if)# switchport mode trunk

Configures the router port connected to the switch as a VLAN trunk port.

Step 5

Router(config-if)# switchport nonegotiate

Puts the LAN port into permanent trunking mode but prevents the port from generating DTP frames

Step 6

Router(config-if)# no ip address

 

Step 7

Router(config-if)# ppp multilink

Enables this interface to support MLP.

Step 8

Router(config-if)# multilink-group 1

Assigns this interface to the multilink group.

Step 9

Router(config-if)# interface Serial1/0/0.1/1/1/1:0

Designates a serial interface as a multilink bundle.

Step 10

Router(config-if)# no ip address

Unassigns the IP address.

Step 11

Router(config-if)# encapsulation ppp

Enables PPP encapsulation.

Step 12

Router(config-if)# ppp multilink

Enables this interface to support MLP.

Step 13

Router(config-if)# multilink-group 1

Assigns this interface to the multilink group 1.

Step 14

Router(config-if)# interface Serial1/0/0.1/1/1/2:0

Designates a serial interface as a multilink bundle.

Step 15

Router(config-if)# no ip address

Unassigns the IP address.

Step 16

Router(config-if)# encapsulation ppp

Enables PPP encapsulation.

Step 17

Router(config-if)# ppp multilink

Enables this interface to support MLP.

Step 18

Router(config-if)# multilink-group 1

Assigns this interface to the multilink group 2.

Step 19

Router(config-if)# shutdown

Shuts down an interface.

Step 20

Router(config-if)# no shutdown

Reopens an interface.

Step 21

Router(config-if)# switchport trunk allowed vlan vlan-list

By default, no VLANs are allowed. Use this command to explicitly allow VLANs; valid values for vlan-list are from 1 to 4094.

Verifying BCP on MLPPP Trunk Mode

To display information about Multilink PPP, use the show ppp multilink command in EXEC mode.

 

Command
Purpose

Router(config-if)# show ppp multilink

Displays information on a multilink group.

The following shows an example of show ppp multilink :

 
Router# show ppp multilink
 
Multilink1, bundle name is group 1
Bundle is Distributed
0 lost fragments, 0 reordered, 0 unassigned, sequence 0x0/0x0 rcvd/sent
0 discarded, 0 lost received, 1/255 load
Member links: 4 active, 0 inactive (max no set, min not set)
Serial1/0/0/:1
Serial1/0/0/:2
Serial1/0/0/:3
Serial1/0/0/:4

FRF.12 Guidelines

FRF.12 functions in hardware. Note the following:

  • Only 3 fragmentation sizes are available - 128 bytes, 256 bytes, and 512 bytes.
    The supported fragment sizes - 128, 256 and 512 - include the FRF and NLPID headers in addition to the payload.
  • If you have a configuration where a C7600 router acts as a Provider Edge(PE) router between Customer Edge(CE) routers, you can configure C7600 in plain Frame Relay or Frame Relay Fragmentation mode. If you enable Frame Relay Fragmentation only at the CE routers and C7600 acts as a plain Frame Relay interface, the configuration works fine. In a configuration of C7600 with any of the three SPAs(8-Port Channelized T1/E1 SPA,1-Port Channelized OC-3/STM-1 SPA or 2 or 4-Port CT3 SPA), where Frame Relay is configured on the serial interface and Frame Relay Fragmentation is enabled in any of the sub interfaces, the fragmented packets may be dropped in the transparant DLCIs. If you want such a configuration to work, you should set the fragment size value on the main interface larger than any CE router fragmentation size usingthe command frame-relay fragment x end-to-end, where x is the fragmentation size on the main interface.

LFI Guidelines

LFI can function two ways - using FRF.12 or MLPPP. MLPPP LFI can be done in both hardware and software while FRF.12 LFI is done only in hardware.

Hardware MLPPP LFI Guidelines

LFI using MLPPP will function only in hardware if there is just one member link in the MLPPP bundle. The link can be a fractional T1 or full T1. Note the following:

  • The ppp multilink interleave command needs to be configured to enable interleaving.
  • Only three fragmentation sizes are supported - 128 bytes, 256 bytes, and 512 bytes.
  • Fragmentation is enabled by default, the default size being 512 bytes.
  • A policy-map having a priority class needs to applied to main interface.
  • When hardware-based LFI is enabled, fragmentation counters are not displayed.

FRF.12 LFI Guidelines

LFI using FRF.12 is always done is hardware. Note the following:

  • The fragmentation is configured at the main interface
  • Only 3 fragmentation sizes are available - 128 bytes, 256 bytes, and 512 bytes.
  • A policy-map having a priority class needs to applied to main interface.

Configuring QoS Features on Serial SPAs

The SIPs and SPAs support many QoS features using modular QoS CLI (MQC) configuration. For information about the QoS features supported by the serial SPAs, see the “Configuring QoS Features on a SIP” section of Chapter5, “Configuring the SIPs and SSC”

Saving the Configuration

Caution When you swap a SPA-2XCT3/DS0-V2 (Pb-free) SPA or SPA-4XCT3/DS0-V2 (Pb-free) SPA with a SPA-2XCT3/DS0 (Pb) SPA or SPA-4XCT3/DS0 (Pb) SPA or vice-versa, configuration is not retained.

To save your running configuration to nonvolatile random-access memory (NVRAM), use the following command in privileged EXEC configuration mode:

 

Command
Purpose

Router# copy running-config startup-config

Writes the new configuration to NVRAM.

For more information about managing configuration files, refer to the Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 and Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 publications.

Verifying the Interface Configuration

Besides using the show running-configuration command to display your Cisco 7600 series router configuration settings, you can use the show interfaces serial and the show controllers serial commands to get detailed information on a per-port basis for your 2-Port and 4-Port Clear Channel T3/E3 SPA.

Verifying Per-Port Interface Status

To find detailed interface information on a per-port basis for the 2-Port and 4-Port Channelized T3 SPA, use the show interfaces serial command.

The following example provides sample output for the serial interface on an un-channelized T3:

Router# show interface serial3/0/0
Serial3/0/0 is down, line protocol is down
Hardware is Channelized/ClearChannel CT3 SPA
MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, loopback not set
Keepalive set (10 sec)
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicast)
0 runts, 0 giants, 0 throttles
0 parity
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 applique, 4 interface resets
0 output buffer failures, 0 output buffers swapped out
1 carrier transitions alarm present
DSU mode 0, bandwidth 44210 Kbit, scramble 1, VC 0
 

The following example provides sample output for the serial interface on a channelized T3:

Router# show interface serial3/0/1/1:0
Serial3/0/1/1:0 is down, line protocol is down
Hardware is Channelized/ClearChannel CT3 SPA
MTU 1500 bytes, BW 832 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, loopback not set
Keepalive set (10 sec)
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicast)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions alarm present
VC 1: timeslot(s): 2-14, Transmitter delay 0, non-inverted data
 

To find detailed status and statistical information on a per-port basis for the 2-Port and 4-Port Clear Channel T3/E3 SPA, use the show controllers serial command.

The following example provides sample controller statistics for the third port on the SPA located in the first subslot of the SIP-200 that is installed in slot 5 of a Cisco 7609 router:

show controller serial 5/0/2
Serial5/0/2 -
Framing is c-bit, Clock Source is Line
Bandwidth limit is 44210, DSU mode 0, Cable length is 10
rx FEBE since last clear counter 0, since reset 0
Data in current interval (807 seconds elapsed):
0 Line Code Violations, 0 P-bit Coding Violation
0 C-bit Coding Violation
0 P-bit Err Secs, 0 P-bit Sev Err Secs
0 Sev Err Framing Secs, 306 Unavailable Secs
500 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
Data in Interval 1:
0 Line Code Violations, 0 P-bit Coding Violation
0 C-bit Coding Violation
0 P-bit Err Secs, 0 P-bit Sev Err Secs
0 Sev Err Framing Secs, 0 Unavailable Secs
564 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
Data in Interval 2:
0 Line Code Violations, 0 P-bit Coding Violation
0 C-bit Coding Violation
0 P-bit Err Secs, 0 P-bit Sev Err Secs
0 Sev Err Framing Secs, 0 Unavailable Secs
564 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
Data in Interval 3:
0 Line Code Violations, 0 P-bit Coding Violation
0 C-bit Coding Violation
0 P-bit Err Secs, 0 P-bit Sev Err Secs
0 Sev Err Framing Secs, 0 Unavailable Secs
562 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
Data in Interval 4:
0 Line Code Violations, 0 P-bit Coding Violation
0 C-bit Coding Violation
0 P-bit Err Secs, 0 P-bit Sev Err Secs
0 Sev Err Framing Secs, 0 Unavailable Secs
560 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
.
.
.
Total Data (last 44 15 minute intervals):
0 Line Code Violations, 0 P-bit Coding Violation,
0 C-bit Coding Violation,
0 P-bit Err Secs, 0 P-bit Sev Err Secs,
0 Sev Err Framing Secs, 0 Unavailable Secs,
24750 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
 
Transmitter is sending AIS.
 
Receiver has loss of signal.
 
40434 Sev Err Line Secs, 0 Far-End Err Secs, 0 Far-End Sev Err Secs
0 P-bit Unavailable Secs, 0 CP-bit Unavailable Secs
0 CP-bit Far-end Unavailable Secs
0 Near-end path failures, 0 Far-end path failures
 
No FEAC code is being received
MDL transmission is disabled

Configuration Examples

This section includes the following configuration examples:

DSU Configuration Example

The following example sets the DSU mode on interface port 0 on slot 4, subslot 1.

! Specify the interface and enter interface configuration mode.
!
Router(config-int)# interface t3 4/1/0
!
!Specifies the interoperability mode used by the T3 interface.
!
Router(config-int)# dsu mode 2
!
!Specifies the maximum allowable bandwidth.
 
Router(config-int)# dsu bandwidth 23000

MDL Configuration Example

The following example configures the MDL strings on controller port 0 on slot 4, subslot 1.

! Enter controller configuration mode.
!
Router(config)# controller t3 4/1/0
!
! Specify the mdl strings.
!
Router(config-controller)# mdl string eic beic
Router(config-controller)# mdl string lic beic
Router(config-controller)# mdl string fic bfix
Router(config-controller)# mdl string unit bunit
Router(config-controller)# mdl string pfi bpfi
Router(config-controller)# mdl string port bport
Router(config-controller)# mdl string generator bgen
Router(config-controller)# mdl transmit path
Router(config-controller)# mdl transmit idle-signal
Router(config-controller)# mdl transmit test-signal

Encapsulation Configuration Example

The following example configures encapsulation on a channelized T1 interface.

! Specify the interface to configure and enter interface configuration mode.
!
Router(config)# interface serial 4/1/1/1:0
!
! Specify the encapsulation method.
!
Router(config-if)# encapsulation ppp
 

The following example configures encapsulation and framing on a un-channelized T3 interface.

! Specify the interface to configure and enter interface configuration mode.
!
Router(config)# interface serial 4/1/1
!
! Specify the encapsulation method.
!
Router(config-if)# encapsulation ppp

Framing—Unchannelized Mode Configuration Example

The following example configures framing on an un-channelized T3 interface.

! Specify the interface to configure and enter interface configuration mode.
!
Router(config)# interface serial 4/1/1
!
! Specify the framing type.
!
Router(config-if)# framing m13

Facility Data Link Configuration Example

The following example configures FDL on a channelized T1 interface.

! Specify the controller to configure and enter controller configuration mode.
!
Router(config)# controller t3 3/1/0
!
! Specify the T1 controller and set the FDL bit.
!
Router(config-controller)# t1 1 fdl ansi

Scrambling Configuration Example

The following example configures scrambling on the T3 interface:

! Enter global configuration mode.
!
Router# configure terminal
!
! Specify the interface to configure and enter interface configuration mode.
!
Router(config)# interface serial 4/1/3
!
! Enable scrambling.
!

Router(config-if)# scrambling

Creating a Multilink Bundle Configuration Example

! ! Enter global configuration mode.
!
Router# configure terminal
!
! Create a multilink interface and enter interface configuration mode.
!
Router(config)# interface multilink 1
!
! Specify the IP address for the interface.
!
Router(config-if)# ip address 123.345.678.21 255.255.255.0
!

Assigning a T1 Interface to a Multilink Bundle Configuration Example

! ! Enter global configuration mode.
!
Router# configure terminal
!
! Specify the T1 interface and enter interface configuration mode.
!
Router(config)# interface serial 1/0/1/1:0
!
! Specify PPP encapsulation.
!
Router(config-if)# encapsulation ppp
!
! Specify the multilink bundle the T1 will belong to.
!
Router(config-if)# multilink-group 1
!

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