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Layer 3 Switching Software Feature and Configuration Guide
78-6235-04, Cisco IOS Release 12.0(10)W5(18)
Chapter 4 Configuring Interfaces
Configuring the ATM Uplink Interface (Catalyst 8540)
To configure the SONET overhead, perform the following steps, beginning in global configuration
mode:
Note On the ATM OC-3c interface, you can configure the c2 byte and the s1s0 bits. On the ATM
OC-12c interface, you can configure the c2 byte, j0 byte, j1 byte, and the s1s0 bits.
The value of the c2 byte is determined as follows:
• If the value of the c2 byte has not been explicitly configured with the sonet overhead command,
the SONET framer sends the ATM payload value of 0x13.
• If the value of the c2 byte has been explicitly configured with the sonet overhead command, the
configured value is sent regardless of the encapsulation method.
The value of the s1s0 byte is determined as follows:
• If the value s1s0 bytes has not been explicitly configured with the sonet overhead command, the
SONET framer sends the following values:
–
For SONET framing, the default value is 0.
–
For SDH framing, the default value is 2.
• If the value of the s1s0 bits have been explicitly configured with the sonet overhead command, the
configured value is used regardless of the framing.
The value of the j0 and the j1 bytes are determined as follows:
• If the value of the j0 and the j1 bytes have not been explicitly configured with the sonet overhead
command, the SONET framer sets default values of 0x0 for both.
• If the user has specified a value using the sonet overhead command, the configured value is used
regardless of the framing.
Command Purpose
Step 1
Router(config)# interface atm
slot/subslot/interface
Router(config-if)#
Enters interface configuration mode and specifies the ATM
interface to configure.
Step 2
Router(config-if)# sonet
overhead [c2 byte] [j0 {bytes |
msg | line}] [j1 {16byte {exp-msg
line| msg line}| 64byte {exp-msg
line | msg line}] [sls0 bits]
Configures the SONET overhead bytes. c2 is a path signal label
identifier, j0 is the section trace bytes, j1 is the path trace bytes,
and sls0 is part of the payload pointer byte.
Step 3
Router(config-if)# no shutdown Enables the interface with the previous configuration.