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Configuring Automatic Protection Switching

78 Enterasys Xpedition User Reference Manual

If the working circuit is disrupted or the bit error rates on the working circuit exceed the

configured thresholds, traffic is automatically switched over to the protecting circuit. Any

physical or logical characteristics configured for the working port are applied to the

protecting port. This includes the IP address and netmask configured for the interface,

spanning tree protocol (STP), per-VLAN spanning tree (PVST), etc.

Configuring Working and Protecting Ports

APS on the XP requires configuration of a working port and a corresponding protecting

port. You can configure any number of PoS ports. The limit is the number of PoS ports on

the XP. Any port on any module can be configured for APS. If one module should go

down, the remaining ports on other modules will remain operational.

Note: The working and protecting ports must reside on the same XP. You cannot

configure APS operation for working and protecting ports on two different XPs.

The working port must:

• Be associated with a point-to-point IP interface that is configured with an IP address

and netmask. See Configuring Packet-over-SONET Links on page 76 for the details on

configuring the interface.

The protecting port must:

• Be in the default VLAN. This means that the protecting port must not be configured for

an interface.

• Not have any explicitly configured parameters. The protecting port inherits the

configuration of the working port.

To configure a working and a protecting PoS port, enter the following command in

Configure mode:

To manage the working and protecting PoS interfaces, enter the following commands in

Configure mode:

Configure working and protecting PoS ports.

sonet set <working-port> protection 1+1

protected-by <protecting-port>

Prevent a working interface from switching to a

protecting port. This command can only be applied

to a port configured as a protecting port.

sonet set <port> protection-switch lockoutprot

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Cabletron Systems SSIM-R8-02 Spécifications Page 98