Configuring Bypass LSP Exclude Interface

At least one excluded interface is mandatory to enable the bypass LSP. Configure static bypass LSPs with at least one exclude-interface or protected interface.

The user must decide on which interface to be protected when that interface is being used by the facility protected FRR LSPs. When an exclude interface goes down, all the facility protected LSP backup paths on the bypass become active and start passing traffic on the bypass LSP.

The user can configure more than one exclude-interface in a bypass LSP. In such a case, the bypass LSP can protect backup sessions from all facility protected FRR LSPs on all the exclude interfaces, provided that their MP and bypass egress match.

An MPLS interface which is configured as an exclude interface for a static bypass LSP is not allowed to be manually unconfigured.

To configure a bypass LSP with an excluded interface, complete the following steps.

1. Enable the device for configuration.
   

   device>configure

2. Enable the MPLS router.
   

   device(config)# router mpls

3. Configure the bypass LSP with the unique static bypass LSP name of my-bypass-lsp.
   

   device(config-router-mpls)# bypass-lsp my-bypass-lsp

4. Configure the static bypass to exclude selected interfaces.
   

   device(config-router-mpls-my-bypass-lsp)# exclude-interface Ethernet 0/8
   device(config-router-mpls-my-bypass-lsp)# exclude-interface ve 203
   device(config-router-mpls-my-bypass-lsp)# exclude-interface Ethernet 0/6  
   

Example

The following example combines the steps above to configure a static bypass LSP to exclude selected interfaces with a unique bypass LSP name of my-bypass-lsp .

device>configure
device(config)# router mpls
device(config-router-mpls)# bypass-lsp my-bypass-lsp
device(config-router-mpls-my-bypass-lsp)# exclude-interface Ethernet 0/8
device(config-router-mpls-my-bypass-lsp)# exclude-interface ve 203
device(config-router-mpls-my-bypass-lsp)# exclude-interface Ethernet 0/6