OC-12 Dynamic Packet Transport (DPT) Port Adapter
Configuring the OC-12c DPT Port Adapter
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Configuring the DPT Port Adapter

Table Of Contents

Configuring the DPT Port Adapter

Using the EXEC Command Interpreter

Configuring the DPT Interface

Shutting Down the Interface

Performing a Basic Configuration

Configuring the Intelligent Protection Switch Feature

Configuring the DPT Topology Feature

Changing the Default Values of Configuration Parameters

Using show Commands to Check System Status

Creating a DPT Ring

Adding or Removing Nodes in a DPT Ring

Adding a Node to a DPT Ring

Removing a Node from a DPT Ring

Checking the Configuration

Using show Commands to Verify the New Interface Status

Using the show version or show hardware Commands

Using the show diag Command

Using the show interfaces Command

Using the ping Command to Verify Network Connectivity


Configuring the DPT Port Adapter


To continue your DPT port adapter installation, you must configure the DPT port adapter. The instructions that follow apply to all supported platforms. Minor differences between the platforms—with Cisco IOS software commands—are noted.

This chapter contains the following sections:

Using the EXEC Command Interpreter

Configuring the DPT Interface

Creating a DPT Ring

Adding or Removing Nodes in a DPT Ring

Checking the Configuration

Using the EXEC Command Interpreter

You modify the configuration of your router through the software command interpreter called the EXEC (also called enable mode). You must enter the privileged level of the EXEC command interpreter with the enable command before you can use the configure command to configure a new interface or change the existing configuration of an interface. The system prompts you for a password if one has been set.

The system prompt for the privileged level ends with a pound sign (#) instead of an angle bracket (>). At the console terminal, use the following procedure to enter the privileged level:


Step 1 At the user-level EXEC prompt, enter the enable command. The EXEC prompts you for a privileged-level password as follows:

Router> enable 

Password: 

Step 2 Enter the password (the password is case sensitive). For security purposes, the password is not displayed.

When you enter the correct password, the system displays the privileged-level system prompt (#):

Router#


To configure the new interface, proceed to the "Configuring the DPT Interface" section.

Configuring the DPT Interface

After you verify that the new DPT port adapter is installed correctly (the enabled LED goes on), use the privileged-level configure command to configure the new interface. Have the following information available:

IP addresses, if you plan to configure the interface for IP routing

Bridging protocols you plan to use

If you installed a new DPT port adapter or if you want to change the configuration of the existing interface, you must enter configuration mode to configure the new interface. If you replaced a DPT port adapter that was previously configured, the system recognizes the new interfaces and brings each of them up in their existing configuration.

For a summary of the configuration options available and instructions for configuring a DPT port adapter, refer to the appropriate configuration publications listed in the "Related Documentation" section.

You execute configuration commands from the privileged level of the EXEC command interpreter, which usually requires password access. Contact your system administrator, if necessary, to obtain password access. (See the "Using the EXEC Command Interpreter" section for an explanation of the privileged level of the EXEC.)

This section contains the following subsections:

Shutting Down the Interface

Performing a Basic Configuration

Configuring the Intelligent Protection Switch Feature

Configuring the DPT Topology Feature

Changing the Default Values of Configuration Parameters

Using show Commands to Check System Status

Shutting Down the Interface

Before you remove an interface that you will not replace, use the shutdown command to shut down (disable) the interface to prevent anomalies when you reinstall the new or reconfigured interface. When you shut down an interface, it is designated administratively down in the show command displays.

Follow these steps to shut down an interface:


Step 1 Enter the privileged level of the EXEC command interpreter (also called enable mode). (See the "Using the EXEC Command Interpreter" section for instructions.)

Step 2 At the privileged-level prompt, enter configuration mode and specify that the console terminal is the source of the configuration subcommands, as follows:

Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#

Step 3 Shut down the interface by entering the interface srp subcommand (followed by the interface address of the interface), and then enter the shutdown command. Table 4-1 shows the command syntax.


Note The interface type of the DPT port adapter is srp.


When you have finished, press Ctrl-Z—hold down the Control key while you press Z—or enter end or exit to exit configuration mode and return to the EXEC command interpreter.

Table 4-1 Syntax of the shutdown Command 

Platform
Command
Example

Cisco 7200 series and Cisco 7200 VXR routers

interface, followed by the type (srp) and slot/port (port-adapter-slot-number/
interface-port-number)

The example shows the DPT interface in port adapter slot 1 being shut down.

Router(config-if)# interface srp 1/0
Router(config-if)# shutdown
Ctrl-Z
Router#

Cisco uBR7246 router

interface, followed by the type (srp) and slot/port (port-adapter-slot-number/
interface-port-number)

The example shows the DPT interface in port adapter slot 1 being shut down.

Router(config-if)# interface srp 1/0
Router(config-if)# shutdown
Ctrl-Z
Router#

Cisco 7500 series router with VIP

interface, followed by the type (srp) and slot/bay/port (port-adapter-slot-number/
VIP-bay-number/interface-port-
number)

The example shows the DPT interface in port adapter slot 1 being shut down.

Router(config-if)# interface srp 1/0/0
Router(config-if)# shutdown
Ctrl-Z
Router#

Step 4 Write the new configuration to NVRAM as follows:

Router# copy running-config startup-config
[OK]
Router#

The system displays an OK message when the configuration has been stored in NVRAM.

Step 5 Verify that new interfaces are now in the correct state (shut down) using the
show interfaces
command (followed by the interface type and interface address of the interface) to display the specific interface. Table 4-2 provides examples.

Table 4-2 Example of the show interfaces Command 

Platform
Command
Example

Cisco 7200 series and Cisco 7200 VXR routers

show interfaces srp, followed by slot/port (port-adapter-slot-number/
interface-port-number)

The example is for interface 0 on a port adapter in port adapter slot 1.

Router# show interfaces srp 1/0

srp 1/0 is administratively down, line 
protocol is down

[Additional display text omitted from this 
example]

Cisco uBR7246 router

show interfaces srp, followed by slot/port (port-adapter-slot-number/
interface-port-number)

The example is for interface 0 on a port adapter in port adapter slot 1.

Router# show interfaces srp 1/0

srp 1/0 is administratively down, line 
protocol is down

[Additional display text omitted from this 
example]

Cisco 7500 series router with VIP

show interfaces srp, followed by slot/bay/port (port-adapter-slot-number/
VIP-bay-number/interface-port-
number)

The example is for interface 0 on a port adapter in port adapter slot 1.

Router# show interfaces srp 1/0/0

srp 1/0 is administratively down, line 
protocol is down

[Additional display text omitted from this 
example]

Step 6 Reenable interfaces by doing the following:

a. Repeat Step 3 to reenable an interface. Substitute the no shutdown command for the shutdown command.

b. Repeat Step 4 to write the new configuration to memory.
Use the copy running-config startup-config command.

c. Repeat Step 5 to verify that the interfaces are in the correct state. Use the
show interfaces command followed by the interface type and interface address of the interface.


For complete descriptions of software configuration commands, refer to the publications listed in the "Related Documentation" section.

Performing a Basic Configuration

This section describes guidelines for performing a basic configuration: enabling the DPT port adapter and specifying IP routing. You might also need to enter other configuration subcommands, depending on the requirements for your system configuration and the protocols you plan to route on the interface. After configuring the DPT port adapter in a Cisco 7200 series, Cisco 7200 VXR, Cisco uBR7246, or Cisco 7500 series router with VIP, see the "Adding a Node to a DPT Ring" section for adding the router to a DPT ring.

Before using the configure command, you must enter the privileged level of the EXEC command interpreter with the enable command. The system prompts you for a password if one has been set.

Use the following procedure to configure the DPT port adapter. Press the Return key after each configuration step, unless otherwise noted.


Step 1 Confirm that the system recognizes the DPT port adapter by entering the show running-config command:

Router# show running-config

For an example of output from the show running-config command, see the "Using show Commands to Check System Status" section.

Step 2 Enter configuration mode and specify that the console terminal is the source of the configuration subcommands:

Router# configure terminal 

Step 3 Enable IP routing by entering the ip routing command:

Router(config)# ip routing

Step 4 At the prompt, specify the new interface to configure by entering the interface command, followed by the type (srp) and slot/port. The example that follows is for a DPT port adapter in slot 1:

Router(config)# interface srp 1/0


Note The interface type of the DPT port adapter is srp.


Step 5 Assign an IP address and subnet mask to the interface with the ip address configuration subcommand, as in the following example:

Router(config)# interface srp 1/0
Router(config-if)# ip address 192.168.2.3 255.0.0.0 

Step 6 Use the srp framing command to verify that the framing is set to SONET for both
side A and side B. The example below shows framing being set to SONET on side B of the DPT port adapter in slot 1:

Router(config)# interface srp 1/0
Router(config-if)# srp framing sonet side b

Step 7 Use the srp internal clock command to set the clock source to internal for both sides of the DPT port adapter. The example below shows side A being set to internal:

Router(config)# interface srp 1/0
Router(config-if)# srp internal clock side a

Step 8 Change the shutdown state to up and enable the interface:

Router(config)# interface srp 1/0
Router(config-if)# no shutdown

The no shutdown command passes an enable command to the DPT port adapter. It also causes the DPT port adapter to configure itself based on the previous configuration commands sent.

Step 9 Add any other configuration subcommands required to enable routing protocols and adjust the interface characteristics.

Step 10 When you have included all of the configuration subcommands to complete the configuration, enter ^Z (press the Control key while you press Z) to exit configuration mode.

Step 11 Write the new configuration to memory:

Router# copy running-config startup-config

The system displays an OK message when the configuration has been stored.


After you have completed your configuration, you can check it using show commands. For an explanation of show commands, see the "Using show Commands to Check System Status" section.

Configuring the Intelligent Protection Switch Feature

Intelligent Protection Switch (IPS) ensures that ring traffic flow continues uninterrupted even if device or ring failures occur. IPS protects the DPT ring by initiating ring wraps that route traffic in the opposite direction over the alternate ring. The system software creates ring wraps by issuing an IPS request when failures are detected. The five types of IPS requests are hierarchical, with higher-priority requests taking precedence over lower-priority requests. For example, if a signal failure was detected at the same time that an operator entered a manual switch request, the system would create the ring wrap at the point of signal failure and the manual switch would be ignored. Table 4-2 lists the types of IPS requests in order of priority.

Table 4-3 IPS Request Hierarchy

Request Type
Originator

1 Forced switch

Operator

2 Signal fail

Software

3 Signal degrade

Software

4 Manual switch

Operator

5 Wait to restore

Software


When you add a node to a DPT ring, you must create a break in the ring. You can create the break by initiating a forced switch request using the srp ips request command. See the "Adding a Node to a DPT Ring" section. The following example shows a forced switch request on side A of the DPT port adapter:

Router(config)# interface srp 2/0
Router(config-if)# srp ips request fs side A

If you need more detailed information about IPS commands, refer to publications listed in the
"Related Documentation" section.

Configuring the DPT Topology Feature

Every node on a DPT ring maintains a topology map of the ring so that it knows where to route traffic. It updates the topology map by periodically sending out a query, called a topology discovery packet, out onto the ring. Each node on the ring adds its own MAC address to the packet. When the discovery packet returns to the originating node, the contents of the packet are used to update the node topology map. You use the srp topology-timer command to set the frequency with which the node sends out topology discovery packets.

The show srp topology command is used to display the MAC addresses of each node on a DPT ring. See the "Using show Commands to Check System Status" section.

If you need more detailed information about DPT topology commands, see the "Related Documentation" section.

Changing the Default Values of Configuration Parameters

The default values of the DPT port adapter configuration parameters can be changed to match your network requirements. Table 4-4 lists the configuration parameter, the command used to alter it, and the default value of the parameter. If you need more detailed configuration information, refer to the publications listed in the "Related Documentation" section.

Table 4-4 DPT Port Adapter Configuration Default Values 

Parameter
Configuration Command
Default Value

Maximum transmission unit (MTU)

mtu bytes

9000 bytes

Buffer size

srp buffer-size bytes

h = 4096 kbytes, m = 4096 kbytes, l = 8192 kbytes

Count

srp count 48-bit source address in hexadecimal format H.H.H.

Deficit round robin

srp deficit-round-robin

quantum = 9216, deficit = 16384

Flag

srp flag [c2 value] [j0 value] [s1s0 value]

c2 set to 0x16; j0 set to 0xcc; s1s0 set to 0

Framing

srp framing [sdh | sonet]

SONET OC-12c

Internal-clock

srp clock-source [internal | line] [a | b]

Internal

IPS

srp ips [request | timer | wtr-timer]

timer = 1 sec, wtr-timer = 60 sec

Loopback

srp loopback [internal | line] [a | b]

Priority map

srp priority-map [receive | transmit]

receive high = 5, receive
med = 3, transmit = 7

Random detect

srp random-detect [compute-interval | input | precedence]

compute interval = 128 sec

Reject

srp reject 48-bit source address in hexadecimal format H.H.H.

Shutdown

srp shutdown [a | b]

Topology timer

srp topology-timer value in seconds

5 sec

TX traffic rate

srp tx-traffic-rate rate in kbps

10,000 kbps


Using show Commands to Check System Status

The system maintains different kinds of information about its configuration and system status. This information can be accessed by using the show commands. This section contains show command information relevant to the installation and configuration of the DPT port adapter. See the "Related Documentation" section to locate more detailed information on show commands.

This section contains examples of the following commands:

show running-config

show version

show protocols

show diag

show controllers srp

show interfaces srp

show srp ips

show srp topology

show srp source-counters

Use the show running-config command to display the currently running configuration. The example below shows that the current software version is Cisco IOS Release 12.0(6)S, a DPT port adapter is installed (the DPT port adapter is shown as interface SRP1/0), and the IP address of the DPT port adapter is 192.168.0.20 255.255.255.0:

Router# show running-config 
Building configuration...
Current configuration:
version 12.0(6)S
service timestamps debug uptime
service timestamps log datetime
no service password-encryption
service udp-small-servers
service tcp-small-servers
!
hostname uut2
!
ip subnet-zero
ip host abrick 192.168.254.254
ip host curly 192.168.1.20
ip host sink 192.168.1.30
ip host sneha 192.168.1.40
ip name-server 192.168.2.132
!
!
!
interface SRP1/0
 mac-address 0010.5555.6666
 ip address 192.168.0.20 255.255.255.0
 no ip directed-broadcast
 no ip route-cache cef
 no ip route-cache distributed
 no keepalive
 no srp random-detect input high
 no srp random-detect input medium
 no srp random-detect input low

Use the show version command to display the configuration of the system hardware, and Cisco IOS software information. The following example shows that the Cisco IOS Release 12.0(6)S is used, and that a DPT port adapter is installed:

Router# show version
Cisco Internetwork Operating System Software 
IOS (tm) 7200 Software (C7200-JS-M), Version 12.0(6)S(19990617:032053)]
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Thu 17-Jun-99 09:32 by iks
Image text-base: 0x600088F8, data-base: 0x611F2000

ROM: System Bootstrap, Version 11.1(13)CA,(f)
BOOTFLASH: 7200 Software (C7200-BOOT-M), Version 11.3(2)AA, R)

router uptime is 4 days, 16 minutes
System returned to ROM by reload
System image file is "tftp://223.255.254.254/c7200-js-mz.Jun17"

cisco 7206 (NPE200) processor with 122880K/8192K bytes of memory.
R5000 CPU at 200Mhz, Implementation 35, Rev 2.1, 512KB L2 Cache
6 slot midplane, Version 1.3

Last reset from power-on
Bridging software.
X.25 software, Version 3.0.0.
SuperLAT software (copyright 1990 by Meridian Technology Corp).
TN3270 Emulation software.
8 Ethernet/IEEE 802.3 interface(s)
1 FastEthernet/IEEE 802.3 interface(s)
1 FDDI network interface(s)
1 SRP network interface(s)
125K bytes of non-volatile configuration memory.
4096K bytes of packet SRAM memory.

20480K bytes of Flash PCMCIA card at slot 0 (Sector size 128K).
4096K bytes of Flash internal SIMM (Sector size 256K).
Configuration register is 0x0

Use the show protocols command to show whether a DPT port adapter is up, as shown in the following example:

Router# show protocols
Global values:
  Internet Protocol routing is enabled
FastEthernet0/0 is up, line protocol is up
Ethernet1/0 is up, line protocol is up
  Internet address is 10.1.1.41/24
Ethernet1/1 is up, line protocol is down
  Internet address is 10.9.9.7/24
Ethernet1/2 is administratively down, line protocol is down
Ethernet1/3 is up, line protocol is down
Ethernet1/4 is up, line protocol is up
Ethernet1/5 is administratively down, line protocol is down
Ethernet1/6 is administratively down, line protocol is down
Ethernet1/7 is administratively down, line protocol is down
Fddi2/0 is down, line protocol is down
  Internet address is 10.4.4.3/24
SRP5/0 is up, line protocol is up
  Internet address is 10.2.2.3/24

Use the show diag command to view system hardware information. The following example shows a DPT port adapter installed in slot 5 and slot 6:

Router# show diag 5
Slot 5/6:
        SRP Double Width, Multi Mode port adapter, 1 port
        Port adapter is analyzed 
        Port adapter insertion time 1w3d ago
        EEPROM contents at hardware discovery:
        Hardware revision 1.0           Board revision UNKNOWN
        Serial number     0             Part number    73-3250-02
        Test history      0x0           RMA number     00-00-00
        EEPROM format version 1
        EEPROM contents (hex):
          0x20: 01 A7 01 00 00 00 00 00 49 0C B2 02 00 00 00 00
          0x30: 03 00 00 00 00 00 00 00 FF FF FF FF FF FF FF FF


Note If you do not designate the slot number with the show diag command, hardware information for all slots is displayed.


Use the show controllers srp command to display the location of the DPT port adapter and other configuration information specific to the DPT port adapter, as shown in the following example:


Router# show controllers srp  
SRP5/0

SRP5/0 - Side A (Outer RX, Inner TX)
SECTION
  LOF = 0          LOS = 0                            BIP(B1) = 0
LINE
  AIS = 0          RDI = 0          FEBE = 0          BIP(B2) = 0
PATH
  AIS = 0          RDI = 0          FEBE = 0          BIP(B3) = 0
  LOP = 0          NEWPTR = 0          PSE = 0           NSE = 0

Active Defects: None
Active Alarms:  None
Alarm reporting enabled for: SF SLOS SLOF B1-TCA B2-TCA PLOP B3-TCA 

IPS
Rx(K1/K2) = 00/00  Rx(S1S0) = 02, Rx(C2) = CF
CLOCK SOURCE
  Internal
PATH TRACE BUFFER: STABLE
  Remote hostname : stingray
  Remote interface: srp1/0/0
  Remote IP addr  : 10.2.2.5
  Remote Ring id  : Outer Ring

BER thresholds:  SF = 10e-3  SD = 10e-6
TCA thresholds:  B1 = 10e-6  B2 = 10e-6  B3 = 10e-6


SRP5/0 - Side B (Inner RX, Outer TX)
SECTION
  LOF = 0          LOS = 0                            BIP(B1) = 0
LINE
  AIS = 0          RDI = 0          FEBE = 0          BIP(B2) = 0
PATH
  AIS = 0          RDI = 0          FEBE = 0          BIP(B3) = 0
  LOP = 0          NEWPTR = 0          PSE = 0           NSE = 0

Active Defects: None
Active Alarms:  None
Alarm reporting enabled for: SF SLOS SLOF B1-TCA B2-TCA PLOP B3-TCA 

IPS
Rx(K1/K2) = 00/00  Rx(S1S0) = 02, Rx(C2) = 06
CLOCK SOURCE
  Internal
PATH TRACE BUFFER: STABLE
  Remote hostname : manofwar
  Remote interface: srp3/0/0
  Remote IP addr  : 10.2.2.6
  Remote Ring id  : Inner Ring

BER thresholds:  SF = 10e-3  SD = 10e-6
TCA thresholds:  B1 = 10e-6  B2 = 10e-6  B3 = 10e-6


Note The DPT port adapter interface type and controller type are srp.


Use the show interfaces srp command to show statistics for the DPT port adapter interfaces, as shown in the following example:

Router# show interfaces srp 5/0
SRP5/0 is up, line protocol is up 
  Hardware is SRP, address is 0010.0ba6.408c (bia 0010.0ba6.408c)
  Internet address is 10.2.2.3/24
  MTU 4470 bytes, BW 622000 Kbit, DLY 100 usec, rely 255/255, load 1/255
  Encapsulation SRP, loopback not set
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters 1w3d
  Queueing strategy: fifo
  Output queue 0/40, 0 drops; input queue 0/75, 0 drops
  5 minute input rate 0 bits/sec, 2 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     2369845 packets input, 158630960 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     2369516 packets output, 158542697 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 output buffer failures, 0 output buffers swapped out
     Side A received errors:
     0 input errors, 0 CRC, 0 runts, 0 giants, 0 ignored, 0 abort
     Side B received errors:
     0 input errors, 0 CRC, 0 runts, 0 giants, 0 ignored, 0 abort

Use the show srp ips command to show IPS information for a specific interface. The following example shows the MAC addresses of the two nodes that are connected to the interface, and information about the state of the connections:

router# show srp ips 2/0

 IPS Information for Interface SRP2/0
MAC Addresses
   Side A (Outer ring RX) neighbour 0000.0000.0002
   Side B (Inner ring RX) neighbour 0000.0000.0001
   Node MAC address 0000.0000.0003
 IPS State
   Side A not wrapped
   Side B wrapped
   Side A (Inner ring TX) IPS pkt. sent every 10 sec. (next pkt. after 6 sec.)
   Side B (Outer ring TX) IPS pkt. sent every 10 sec. (next pkt. after 6 sec.)
   IPS WTR period is 60 sec. (timer is inactive)
   Node IPS State WRAPPED
 IPS Self Detected Requests
   Side A IDLE
   Side B SF  
 IPS messages received
   Side A (Outer ring RX) {0000.0000.0002,SF  ,L,1024}
   Side B (Inner ring RX) {0000.0000.0001,IDLE,S,1024}
 IPS messages transmitted
   Side A (Inner ring TX) {0000.0000.0003,SF  ,L,1024}
   Side B (Outer ring TX) {0000.0000.0003,SF  ,S,1024}

 Source Address Information for Interface SRP2/0
    000a.1234.bcde, reject
    000b.1234.bcde, pkt. count 0

 Topology Map for Interface SRP2/0
  Topology pkt. sent every 20 sec. (next pkt. after 1 sec.)
  Last received topology pkt. 00:00:18
  Nodes on the ring:2
  Hops (outer ring)    Address
        0          0000.0000.0003  Wrapped
        1          0000.0000.0002  Wrapped

Use the show srp topology command to show the identity of the nodes on the DPT ring according to their MAC addresses. The following examples show a three-node DPT ring. In the second example, nodes 0 and 2 are wrapped:

Router# show srp topology
 
Topology Map for Interface SRP5/0
  Topology pkt. sent every 61 sec. (next pkt. after 16 sec.)
  Last received topology pkt. 00:00:45
  Nodes on the ring:3
  Hops (outer ring)    Address
        0          0000.0000.0001  
        1          0000.0000.0002  
        2          0000.0000.0003  

Router# show srp topology

Topology Map for Interface SRP5/0
  Topology pkt. sent every 61 sec. (next pkt. after 54 sec.)
  Last received topology pkt. 00:00:07
  Nodes on the ring:3
  Hops (Outer ring)    Address
        0          0000.0000.0001 Wrapped
        1          0000.0000.0002
        2          0000.0000.0003 Wrapped

Use the show srp source-counters command to show the number of packets received or rejected when SRP count and reject have been configured. The following example shows 1201 packets have come from another node, and 400 have been rejected:

Router# show srp source-counters 
 
 Source Address Information for Interface SRP5/0
    000a.1234.5678, index 1, pkt. count 1201
    000b.1234.5678, reject, pkt. count 400

Creating a DPT Ring

A DPT ring may contain as many as 32 nodes, or as few as 2 nodes. This section documents the layout and configuration of a three-node DPT ring. It is assumed that the actual physical installation of the Cisco 7200 series, Cisco 7200 VXR, Cisco uBR7246, or Cisco 7500 series router with VIP has already been accomplished.

Before the DPT ring can be created, each router (node) must have a DPT port adapter installed and configured. See the "Port Adapter Removal and Installation" section on page 3-7, and the "Configuring the DPT Interface" section. Once the individual nodes are configured, the inner and outer rings of the DPT ring must be connected as shown in Figure 4-1, and the DPT port adapters must be enabled. The following procedure describes the internodal connections of the DPT ring and the configuration commands used to create the ring.

Figure 4-1 Three-Node DPT Ring


Step 1 While in configuration mode, use the shutdown command to disable the DPT port adapter on each node, as shown below:

Router(config)# interface srp 1/0
Router(config-if)# shutdown

Step 2 Connect the nodes as shown in Figure 4-2, being careful to observe the receive (RX) and transmit (TX) cable relationship. Table 4-5 lists the internodal cable connections for a three-node DPT ring.


Note Side A (RX outer/TX inner) of the DPT port adapter must be connected to side B (TX outer/RX inner) of the DPT port adapter in the next node in the ring. See Figure 4-2 for the correct orientation of side A and side B.


Figure 4-2 Internodal Connections of a Three-Node DPT Ring

Step 3 Use the no shutdown command to enable the DPT port adapter of each node, as shown below:

Router(config)# interface srp 1/0
Router(config-if)# no shutdown

Step 4 Use the show srp topology command to verify that the all three nodes are recognized as part of the DPT ring. The output shows the number of nodes on the ring and their MAC addresses. See the "Using show Commands to Check System Status" section.


Table 4-5 Three-Node DPT Ring Cable Connections

Internodal Cable Connections
From Node/Connector
To Node/Connector

Node A/RX outer

Node C/TX outer

Node A/TX inner

Node C/RX inner

Node A/TX outer

Node B/RX outer

Node A/RX inner

Node B/TX inner

Node B/RX outer

Node A/TX outer

Node B/TX inner

Node A/RX inner

Node B/TX outer

Node C/RX outer

Node B/RX inner

Node C/TX inner

Node C/RX outer

Node B/TX outer

Node C/TX inner

Node B/RX inner

Node C/TX outer

Node A/RX outer

Node C/RX inner

Node A/TX inner


Adding or Removing Nodes in a DPT Ring

The following sections describe the procedures for adding or removing a node in a DPT ring:

Adding a Node to a DPT Ring

Removing a Node from a DPT Ring

Adding a Node to a DPT Ring

When you want to install a new node in a DPT ring, you must first install and configure a DPT port adapter in the Cisco 7200 series, Cisco 7200 VXR, Cisco uBR7246, or Cisco 7500 series router with VIP, and then install and configure the router as a node in the DPT ring. This section describes the procedure for adding a node to a DPT ring.

To add a node to a DPT ring, you must first reroute the traffic flow over the ring through an alternate path by creating a ring wrap where the new node is to be installed. Figure 4-3 shows a four-node DPT ring. Use the following procedure to add a node between nodes A and D on the ring:


Step 1 While in global configuration mode, stop data traffic between nodes A and D on the DPT ring by entering the forced-switch command srp ips request forced-switch a on the node A router. See the "Configuring the Intelligent Protection Switch Feature" section. This creates two ring wraps between the two nodes. (See Figure 4-4.)

Figure 4-3 DPT Ring Topology with Four Nodes

Figure 4-4 DPT Ring with Ring Wraps Created by a Forced Switch

Step 2 From the configuration mode, enter the command show srp topology to verify that the ring wraps are in place. See the "Using show Commands to Check System Status" section.

Step 3 Disconnect the fiber-optic cables connecting side A of node A to side B of node D. (See Figure 4-4).

Step 4 Connect side A of node A to side B of the new node (node E), using two simplex or one duplex fiber-optic cable. See the "Cables, Connectors, and Pinouts" section on page 1-6. Connect side A of the new node to side B of node D. (See Figure 4-5).


Note Be careful to observe the proper cable orientation. When using duplex cables, you must reverse one of the cable ends for correct orientation.


Step 5 If the DPT port adapter in the new router (node E) has not been configured, do so at this time. See the "Configuring the DPT Interface" section.

Step 6 Enter the no shutdown command to bring up the node E router.

Step 7 Confirm that the system recognizes the new node by entering the show srp topology command. The output shows the number of nodes on the ring, their MAC addresses, and the state of the nodes (wrapped or not).

Step 8 Remove the two ring wraps created by the forced switch on nodes A and D by entering the no srp ips request forced-switch a command on the node A router.

Step 9 Confirm that the ring wraps are no longer in place by entering the show srp topology command. The output shows the number of nodes on the ring, their MAC addresses, and the state of the nodes (wrapped or not).


Figure 4-5 DPT Ring Topology with an Added Node


Note You can add a node to a DPT ring without entering the srp ips forced-switch command, but you then cannot control when the traffic is rerouted and restored; the system determines the time instead.


Removing a Node from a DPT Ring

This section describes the procedure for removing a node from a DPT ring. The following steps describe how to remove node D from a four-node DPT ring, similar to that shown in Figure 4-3.


Step 1 Isolate node D by entering the forced-switch command srp ips request forced-switch a on the node A router, and srp ips request forced-switch b on the node C router.

Step 2 Enter the show srp topology command on either router to verify that the ring wraps are in place and that node D no longer exists on the ring.

Step 3 Disconnect both ends of the cable connecting side A of node D to side B of node C.

Step 4 Disconnect the cable connected to side B of node D and connect it to side B of node C.

Step 5 Remove the two ring wraps created by the forced switch on nodes A and C by entering the no srp ips request forced-switch a command on node A, and no srp ips request forced-switch b command on node C.

Step 6 Enable IP routing by entering the ip routing command to restart data traffic.


This completes the procedure for removing a node from a DPT ring.

Checking the Configuration

After configuring the new interface, use the show commands to display the status of the new interface or all interfaces, and use the ping and loopback commands to check connectivity. This section includes the following subsections:

Using show Commands to Verify the New Interface Status

Using the ping Command to Verify Network Connectivity

Using show Commands to Verify the New Interface Status

Table 4-6 demonstrates how you can use the show commands to verify that new interfaces are configured and operating correctly and that the DPT port adapter appears in them correctly. Sample displays of the output of selected show commands appear in the sections that follow. For complete command descriptions and examples, refer to the publications listed in the "Related Documentation" section.


Note The outputs that appear in this document may not match the output you receive when running these commands. The outputs in this document are examples only.


Table 4-6 Using show Commands 

Command 1
Function
Example

show version or
show hardware

Displays system hardware configuration, the number of each interface type installed, Cisco IOS software version, names and sources of configuration files, and boot images

Router# show version

show controllers

Displays all the current interface processors and their interfaces

Router# show controllers

show diag slot

Displays types of port adapters installed in your system and information about a specific port adapter slot, interface processor slot, or chassis slot

Router# show diag 2

show interfaces type port-adapter-slot-number/
interface-port-number

Displays status information about a specific type of interface (for example, srp) in a Cisco 7200 series router

Router# show interfaces srp 1/0

show interfaces type 1 /interface-port-number

Displays status information about a specific type of interface (for example, srp) in a Cisco uBR7246 router

Router# show interfaces srp 1/0

show protocols

Displays protocols configured for the entire system and for specific interfaces

Router# show protocols

show running-config

Displays the running configuration file

Router# show running-config

show startup-config

Displays the configuration stored in NVRAM

Router# show startup-config

1 Refer to "Identifying Interface Addresses" section on page 1-10 for interface addresses on the Cisco 7500 series routers with VIP.



If an interface is shut down and you configured it as up, or if the displays indicate that the hardware is not functioning properly, ensure that the interface is properly connected and terminated. If you still have problems bringing up the interface, contact a service representative for assistance. This section includes the following subsections:

Using the show version or show hardware Commands

Using the show diag Command

Using the show interfaces Command

Choose the subsection appropriate for your system. Proceed to the "Using the ping Command to Verify Network Connectivity" section when you have finished using the show commands.

Using the show version or show hardware Commands

Display the configuration of the system hardware, the number of each interface type installed, the Cisco IOS software version, the names and sources of configuration files, and the boot images, using the show version (or show hardware) command.


Note The outputs that appear in this document may not match the output you receive when running these commands. The outputs in this document are examples only.


Cisco 7200 Series and Cisco uBR7200 Series Routers

Following is an example of the show version command from a Cisco 7200 series router with the DPT port adapter:

Router# show version

Cisco Internetwork Operating System Software
IOS (tm) 7200 Software (C7200-J-M), Version 11.1(7)CA [biff 105]
Copyright (c) 1986-1996 by cisco Systems, Inc.
Compiled Sun 04-Aug-96 06:00 by biff
Image text-base: 0x600088A0, data-base: 0x605A4000

ROM: System Bootstrap, Version 11.1(7)CA RELEASED SOFTWARE

Router uptime is 4 hours, 22 minutes
System restarted by reload
System image file is "c7200-j-mz", booted via slot0

cisco 7206 (NPE150) processor with 12288K/4096K bytes of memory.
R4700 processor, Implementation 33, Revision 1.0 (Level 2 Cache)
Last reset from power-on
Bridging software.
SuperLAT software (copyright 1990 by Meridian Technology Corp).
X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.
TN3270 Emulation software (copyright 1994 by TGV INC).
Chassis Interface.
4 Ethernet/IEEE 802.3 interfaces.
2 FastEthernet/IEEE 802.3 interfaces.
4 Token Ring /IEEE802.5 interfaces.
12 Serial network interfaces.
1 Compression port adapter.
125K bytes of non-volatile configuration memory.
1024K bytes of packet SRAM memory.

20480K bytes of Flash PCMCIA card at slot 0 (Sector size 128K).
8192K bytes of Flash internal SIMM (Sector size 256K).
Configuration register is 0x2

Using the show diag Command

Display the types of port adapters installed in your system (and specific information about each) using the show diag slot command, where slot is the port adapter slot in a Cisco 7200 series, Cisco uBR7200, and Cisco 7500 series routers with VIP.


Note The outputs that appear in this document may not match the output you receive when running these commands. The outputs in this document are examples only.


Cisco 7200 Series and Cisco uBR7200 Series Routers

Following is an example of the show diag slot command that shows a DPT port adapter in port adapter slot 1 of a Cisco 7200 series router:

Router# show diag 1
Slot 1:
Mueslix serial (RS232) port adapter, 8 ports
Port adapter is analyzed
Port adapter insertion time 2d09h ago
Hardware revision 255.255               Board revision UNKNOWN
Serial number     4294967295    Part number    255-65535-255
Test history      0xFF          RMA number     255-255-255
EEPROM format version 1
EEPROM contents (hex):
0x20: 01 0D FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0x30: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

Note Port adapters used with Cisco 7200 VXR routers require the correct base hardware revision in order to function. The following error message occurs on bootup if the incorrect hardware revision is used:

> PA-3-REVNOTSUPPORTED:PA in slot 1 (Ethernet) requires base h/w revision of (1.14) for this chassis

Use the show diag command to display the hardware revision.


Using the show interfaces Command

The show interfaces command displays status information (including the physical slot and interface address) for the interfaces you specify. All of the examples that follow specify srp interfaces.

For complete descriptions of interface subcommands and the configuration options available for Cisco 7200, Cisco uBR7200, and Cisco 7500 series routers, refer to the publications listed in the "Related Documentation" section.


Note The outputs that appear in this document may not match the output you receive when running these commands. The outputs in this document are examples only.


Cisco 7200 Series and Cisco uBR7200 Series Routers

Following is an example of the show interfaces command for Cisco 7200 series and Cisco uBR7200 series routers. Following is an example of the show interfaces srp command, which shows all of the information specific to interface port 0 on a DPT port adapter installed in port adapter slot 1:

Router# show interfaces srp 1/0
SRP1/0 is up, line protocol is up 
  Hardware is SRP, address is 0010.0ba6.408c (bia 0010.0ba6.408c)
  Internet address is 10.2.2.3/24
  MTU 4470 bytes, BW 622000 Kbit, DLY 100 usec, rely 255/255, load 1/255
  Encapsulation SRP, loopback not set
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters 1w3d
  Queueing strategy: fifo
  Output queue 0/40, 0 drops; input queue 0/75, 0 drops
  5 minute input rate 0 bits/sec, 2 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     2369845 packets input, 158630960 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     2369516 packets output, 158542697 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 output buffer failures, 0 output buffers swapped out
     Side A received errors:
     0 input errors, 0 CRC, 0 runts, 0 giants, 0 ignored, 0 abort
     Side B received errors:
     0 input errors, 0 CRC, 0 runts, 0 giants, 0 ignored, 0 abort

Using the ping Command to Verify Network Connectivity

Using the ping command, you can verify that an interface port is functioning properly. This section provides a brief description of this command. Refer to the publications listed in the "Related Documentation" section for detailed command descriptions and examples.

The ping command sends echo request packets out to a remote device at an IP address that you specify. After sending an echo request, the system waits a specified time for the remote device to reply. Each echo reply is displayed as an exclamation point (!) on the console terminal; each request that is not returned before the specified timeout is displayed as a period (.). A series of exclamation points (!!!!!) indicates a good connection; a series of periods (.....) or the messages [timed out] or [failed] indicate a bad connection.

Following is an example of a successful ping command to a remote server with the address 10.0.0.10:

Router# ping 10.0.0.10 <Return>
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echoes to 10.0.0.10, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/15/64 ms
Router#

If the connection fails, verify that you have the correct IP address for the destination and that the device is active (powered on), and repeat the ping command.