June 30, 2006 Chapter 7: Second Level Commands
SG1-UM-8500-03 7-67
Using mpls ip default-route command
It enables the distribution of labels associated with the IP default route.
Usage
mpls ip default-route
Example
Using no mpls ip default-route command
It disables the distribution of labels associated with the IP default route.
Usage
no mpls ip default-route
Example
Using the vrrp command
The SCC redundancy mechanism is based on the Virtual Router2 Redundancy Protocol (VRRP RFC-2338), which
is designed to eliminate the single point of failure inherent in the static default routed environment. VRRP specifies
an election protocol that dynamically assigns responsibility for a virtual router to one of the VRRP routers on a LAN.
The VRRP router controlling the IP address(es) associated with a virtual router is called the Master, and forwards
packets sent to these IP addresses. The election process provides dynamic fail-over in the forwarding responsibility
should the Master become unavailable. Any of the virtual router's IP addresses on a LAN can then be used as the
default first hop router by end-hosts.
This is beneficial because VRRP is a higher availability default path without requiring configuration of dynamic
routing or router discovery protocols on every end-host.
Usage
vrrp interface <Ethernet | VLAN> <slot number>\<port number>[\VLAN ID>] <number> ip
<IP address> priority <priority value> [preempt-mode <on | off>]
Host(config)# mpls ip default-route
Host(config)# mpls ip default-route
Host(config)# no mpls ip default-route
Host(config)# no mpls ip default-route
Host(config)# vrrp interface
Note: The virtual router IP should belong to the same subnet as the protected interface. The VRRP preempt
mode default value is off. The write terminal command should not present the preempt-mode when set to
its default value.
