Technical data

10 Brocade MLX Series and NetIron Family Documentation Updates

53-1002805-03

IPv6 VRRP-E short path forwarding for MCT

When both MCT devices act as the VRRP or VRRP-E backup routers, the following behavior will be

seen:

• Packets sent to VRRP-E virtual IPv6 address will be L2 switched to the VRRP-E master router

for forwarding.

• VRRP-E MAC will be learned by both MCT switches acting as backup routers.

• Both data traffic and VRRP-E control traffic will need to travel through ICL unless the short-path

forwarding feature is enabled.

Under the IPv6 VRRP-E VRID configuration level, use the short-path-forwarding command. If the

revertible option is not enabled, short path forwarding will be disabled if the VRRP-E router priority

is below the revert-priority configured value.Use the following command to enable short path

forwarding.

Brocade(config-if-e1000-vrid-2)# short-path-forwarding revert-priority 60

Syntax: [no] short-path-forwarding [revert-priority value]

Use the supplied priority value as a threshold to determine if the short-path-forwarding behavior

should be effective or not. If one or more ports tracked by the track-port command go down, the

current priority of IPv6 VRRP-E will be lowered by a specific amount configured in the track-port

command for each port that goes down.

Once the current-priority is lower than the threshold, the short-path-forwarding will be temporally

suspended and revert back to the regular VRRP-E forwarding behavior without

short-path-forwarding enabled.

The reverting behavior is only temporary. If one or more of the already down ports tracked by the

track-port command come back, it is possible that the current priority of VRRP-E will be higher than

the threshold again and the short-path-forwarding behavior will be resumed.

IPv6 VRRP-E short-path forwarding delay

Use IPv6 VRRP-e short-path forwarding delay to configure the time delay required to enable short

path forwarding after reloading the backup router. When configured, short path forwarding will be

enabled only after the configured delay time after the MP initialization is completed (from the time

all modules in the system are UP). Default value is set to 0 seconds.

This is global IPv6 VRRP-E configuration will effect all IPv6 VRRP-E instances.

Brocade(config)# [no] short-path-forwarding-delay 100

Syntax: short-path-forwarding-delay seconds

Sample configurations

Brocade(config)#short-path-forwarding-delay 100

Brocade(config)#ipv6 router vrrp-extended

Brocade(config-ipv6-vrrpe-router)#interface ve 10

Brocade(config-vif-10)# ipv6 address 2003::10:11/64

Brocade(config-vif-10)#ipv6 vrrp-extended vrid 10

Brocade(config-vif-10-ipv6-vrid-10)#backup priority 50

Brocade(config-vif-10-ipv6-vrid-10)#ipv6-address 2003::11:50

Brocade(config-vif-10-ipv6-vrid-10)#short-path-forwarding revert-priority 120