Enable IPv6 Alternative Routes

Use this procedure to enable IPv6 alternative routes and view the configuration on the switch.

Procedure

Enter either Global Configuration mode or VRF Router Configuration mode for a specific VRF context:

enable

configure terminal

Optional: router vrf WORD<1-16>
Enable IPv6 alternative routes:

ipv6 alternative-route

Note

IPv6 alternative routes are enabled by default.
Verify the configuration of the IPv6 alternative route:

show ipv6 global [vrf WORD<1–16> | vrfids WORD<0–512>]

show ipv6 route alternative [vrf WORD<1–16> | vrfids WORD<0–512>]

Example:

Switch:1>enable
Switch:1#configure terminal
Switch:1(config)#router vrf globalRouter
Switch:1(router-vrf)#ipv6 alternative-route

Switch:1#show ipv6 global
================================================================================
                     IPv6 Global Information - GlobalRouter
================================================================================
        forwarding                     : enable
        default-hop-cnt                : 64
        number-of-interfaces           : 0
        icmp-error-interval            : 1000
        icmp-error-quota               : 50
        icmp-unreach-msg               : disable
        icmp-addr-unreach-msg          : enable
        icmp-port-unreach-msg          : enable
        icmp-echo-multicast-request    : enable
        static-route-admin-status      : enable
        alternative-route              : enable
        ecmp                           : disable
        ecmp-max-path                  : 1
        source-route                   : disable
        host-autoconfig                : disable

Switch:1#show ipv6 route alternative

========================================================================================================
                             IPv6 Routing Table Information - GlobalRouter
========================================================================================================
Destination Address/PrefixLen  NEXT HOP                        VID/BID/TID  PROTO   COST  AGE   TYPE PREF
--------------------------------------------------------------------------------------------------------
2910:0:0:1:0:0:0:0/64          fe80:0:0:0:b2ad:aaff:fe42:dd00  V-3          OSPF    2     0     B    20
2912:0:0:1:0:0:0:0/64          0:0:0:0:0:0:0:0                 V-1001       LOCAL   1     0     B    0
2912:0:0:1:0:0:0:0/64          0:0:0:0:0:0:0:0                 T-10         BGP     1     0     A    45
3000:0:0:1:0:0:0:0/64          0:0:0:0:0:0:0:0                 V-3          LOCAL   1     0     B    0
4001:0:0:1:0:0:0:0/64          0:0:0:0:0:0:0:0                 T-10         LOCAL   1     0     B    0
5910:0:0:1:0:0:0:0/64          0:0:0:0:0:0:0:0                 T-10         BGP     1     0     B    45
5910:0:0:1:0:0:0:0/64          fe80:0:0:0:b2ad:aaff:fe42:dd00  V-3          OSPF    2     0     A    120
5910:0:0:2:0:0:0:0/64          0:0:0:0:0:0:0:0                 T-10         BGP     1     0     B    45
5910:0:0:2:0:0:0:0/64          fe80:0:0:0:b2ad:aaff:fe42:dd00  V-3          OSPF    2     0     A    120
-------------------------------------------------------------------------------------------------------

13 out of 13 Total Num of Route Entries displayed.
-------------------------------------------------------------------------------------------------------

TYPE Legend:
A=Alternative Route, B=Best Route, E=Ecmp Route