Alcatel-Lucent 6850-48 Network Guide

Quick Steps for Configuring MPLS

Configuring MPLS

page 10-10

OmniSwitch AOS Release 6 Network Configuration Guide

2 Configure the label-map pop operation using the 

command:

-> configure router mpls interface vlan-10 label-map 888 pop

The above command pops (removes) label 888 off of the label stack and then forwards the packet on to the 
customer site. This action marks the end of MPLS label switching and the static LSP tunnel.

3 Optional. By default, the MPLS label-map is administratively enabled. To disable the administrative 
status of the label-map, use the 

 command. For 

example:

-> configure router mpls interface vlan-10 label-map 888 shutdown

Static Fast ReRoute (FRR) provides a mechanism for rerouting traffic to an alternate path in the event a 
primary path goes down. This mechanism is implicitly invoked when the following occurs:

• A backup static LSP tunnel is created on the same ingress router as the primary tunnel.

• A protect-swap label-map is created on a transit router to protect the next-hop segment in the LSP.

The following steps provide a quick tutorial for configuring a backup static LSP tunnel:

1 On the ingress router for the primary (protected) static LSP tunnel, configure another static LSP (with a 
different name) using the 

 command. For example:

-> configure router mpls static-lsp to-R3-backup

2 Configure the destination of the “to-R3-backup” static LSP using the 

 command. Specify the same destination system IP (Loopback0) address that is used by the protected 

static LSP. For example, the following command configures 10.10.10.2 as the destination for “to-R3-
backup”. The protected LSP is also configured with the 10.10.10.2 destination address.

-> configure router mpls static-lsp to-R3-backup to 10.10.10.2

When the above command is used, “to-R3-backup” automatically becomes a backup tunnel for the pro-
tected static LSP. In other words, there are now redundant static LSP tunnels. FRR will redirect traffic to the 
backup tunnel if the protected tunnel is down.

3 Configure the MPLS push operation and next-hop value for “to-R3-backup” using the 

 command. Specify the system IP address for the next router in the 

backup tunnel, not the next router in the protected tunnel. For example: 

-> configure router mpls static-lsp to-R3-backup push 777 next-hop 192.168.11.1

The above command pushes label 777 onto the top of the label stack and then forwards the packet to the to 
192.168.11.1, which is the next-hop router in the “to-R3-backup” path.

4 By default, a static LSP is disabled when it is created. To enable the static LSP use the 

 command with the no shutdown option. For example, the following 

command enables the “to-R3-backup” static LSP:

-> configure router mpls static-lsp to-R3-backup no shutdown