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This chapter describes the procedure for configuring a Cisco 10000 OC-12 Packet over SONET (POS) line card. Figure 4-1 shows the OC-12 POS line card.
Table 4-1 lists default values for the OC-12 POS line card. The commands marked with an asterisk (*) are described in the Cisco IOS Command Reference. The other commands are among those described in this chapter.
The table includes the command used for modifying a default value and indicates whether a value needs to be the same (or opposite) on the remote end of the connection.
| Command Name | Default Setting | Command Syntax | Remote Side Setting |
|---|---|---|---|
622000 | bandwidth kilobits | Same. | |
line | clock source [line | internal] | At least one side must be set to internal. | |
32 | crc [16 | 32] | Same. | |
HDLC | encapsulation [hdlc | ppp] | Same. | |
no keepalive | [no] keepalive period | Same. | |
4470 | mtu size | Same. | |
SONET | pos framing [sonet | sdh] | Same. | |
No scrambling | [no] pos scramble-atm | Same. | |
c2—0xcf | pos flag [c2 | j0 | s1s0] value | Same. |
To specify an interface number in a configuration command, use the syntax in Table 4-2 to identify interfaces on the OC-12 POS line card.
| Type of Interface | Slot | Subslot | Port |
|---|---|---|---|
POS interface | 1 to 8/ | 0/ | 0 |
The following example shows the syntax for configuring an OC-12 POS card in slot 1:
Router(config)# interface pos 1/0/0
After you verify that the OC-12 POS line card is installed correctly, use the following procedure to configure the new interface. Be prepared with the information you will need, such as the interface IP address.
The following procedure is for creating a basic configuration—enabling an interface and specifying IP routing.
Router(config)# interface pos 1/0/0
Step 2 Assign an IP address and a subnet mask to the interface with the ip address configuration subcommand, as in the following example:
Router(config-if)# ip address 192.168.255.255 255.255.255.0
Step 3 Specify either HDLC or PPP encapsulation. For example:
Router(config-if)# encapsulation hdlc
Step 4 If necessary, modify the OC-12 POS line card configuration or that of the remote device to ensure that, where appropriate, they use the same settings. For more information, refer to the Remote Side Setting column in Table 4-1.
Step 5 Add any other configuration subcommands required for the enabling of routing protocols and adjust the interface characteristics.
Step 6 Enter the no shutdown command to enable the interface.
Router(config-if)# no shutdown
Step 7 When you have included all of the configuration subcommands to complete the configuration, enter Cntl-Z to exit configuration mode.
Step 8 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 the show interface pos slot/subslot/port.
The following sections present some of the commands that you can use to customize your Cisco 10000 OC-12 POS line card configuration.
At the prompt, set the internal or line clock source by using the clock source command.
clock source {internal | line}
Where:
The default is clock source internal.
In this example, the line card is instructed to use a line clock source.
Router(config)# interface pos 1/0/0 Router(config-if)# clock source line
You can use the pos framing command to set framing to SONET STS-3c or SDH STM-1 framing.
pos framing [sdh | sonet][no]pos framing
The default is SONET.
Make sure your system supports SDH before using this option.
Use the no form of the command to restore the default framing mode.
In the following example, the framing type is set to SONET:
Router(config)# interface pos 5/0/0 Router(config-if)# no pos framing
You can use the pos flag command to assign values for specific elements of the frame header. This command is typically used to meet a standards requirement or to ensure interoperability with another vendor's equipment.
pos flag[c2 value][j0 value] [s1s0 value][no]pos flag[c2 value][j0 value] [s1s0 value]
Where:
The default values are c2—0xCF, j0—0xCC, and s1s0—0.
Use the no form of the command to restore the default values.
In the following example, the c2 bit is set to 0xCF.
Router(config)# interface pos 5/0/0 Router(config-if)# pos flag c2 0xCF
The pos scramble-atm command allows you to scramble the POS synchronous payload envelope (SPE). SONET payload scrambling applies a self-synchronous scrambler to the SPE of the interface to ensure sufficient bit transition density.
pos scramble-atm[no]pos scramble-atm
The default is no POS SPE scrambling.
Use the no form of the command to disable scrambling.
In the following example, scrambling is enabled:
Router(config)# interface pos 5/0/0 Router(config-if)# pos scramble-atm
To enable loopback testing of data transmitted from the Cisco 10000 ESR PRE card to the OC-12 POS card and back, use the loopback command in interface configuration mode.
loopback [line | internal][no]loopback [line | internal]
Where:
Both line and internal do the following:
Use the no form of the command to stop the loopback test.
For more information on loopbacks, refer to the online Cisco 10000 ESR Troubleshooting Guide.
In the following example, a loopback is set for the OC-12 POS line card in slot 5:
Router(config)# interface pos 5/0/0 Router(config-if)# loopback line
Posted: Tue Oct 3 09:46:51 PDT 2000
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