Cisco Systems 8540 CSR, 8510 CSR Configuring Framing, Configuring Sonet Overhead, Sdh sonet

Chapter 4 Configuring Interfaces

Configuring the POS OC-12c Uplink Interface (Catalyst 8540)

Configuring Framing

The default framing mode for the POS OC-12c uplink interface is SONET STS-12c. You can also configure the interface for SDH STM-4, which is more widely used in Europe. To configure the framing mode on the POS OC-12c uplink interface, perform the following steps, beginning in global configuration mode:

	Command	Purpose
Step 1
	Router(config)# interface pos	Enters interface configuration mode and specifies the POS
	slot/subslot/interface	interface to configure.
	Router(config-if)#
Step 2
	Router(config-if)# pos framing	Configures the framing mode.
	{sdh sonet}	POS framing defaults to SONET. The following default values
		are used for SONET.
		• s1s0 default value is 0.
		• J1 defaults set to host name, interface name, and IP address.
		The following default values are used for SDH framing:
		• s1s0 default value is 2.
		• J1 is the path trace string. Its default setting is empty and is
		not configurable.
Step 3
	Router(config-if)# no shutdown	Enables the interface with the previous configuration.

Configuring SONET Overhead

You can set the SONET overhead bytes in the frame header to meet a specific standards requirement or to ensure interoperability of the POS OC-12c uplink interface with another vendor's equipment. To configure the SONET overhead, perform the following steps, beginning in global configuration mode:

	Command	Purpose
Step 1
	Router(config)# interface pos	Enters interface configuration mode and specifies the POS
	slot/subslot/interface	interface to configure.
	Router(config-if)#
Step 2
	Router(config-if)# pos flag {c2	Configures the SONET overhead bytes. c2 is a path signal
	value j0 value sls0 value}	identifier, j0 is the section trace byte, and sls0 is the bit s1 and s0
		of the H1 payload pointer byte.
Step 3
	Router(config-if)# no shutdown	Enables the interface with the previous configuration.

	Layer 3 Switching Software Feature and Configuration Guide
4-18	78-6235-04, Cisco IOS Release 12.0(10)W5(18)