Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 692)

662 Multi-Service IronWare Switching Configuration Guide
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MCT for VRRP or VRRP-E
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• The VRRP-E MAC will be learned by the other MCT switch that acts as backup router.
• Both data traffic and VRRP-E control traffic will need to travel through ICL unless the short-path
forwarding feature is enabled.
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 IP 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.
VRRP-E short-path forwarding and revertible option
The track-port command will monitor the status of the outgoing port on the backup. It will revert
back to standard behavior (no short-path forwarding) temporarily even if short-path forwarding is
configured.
Under the VRRP-E VRID configuration level, use the short-path-forwarding command. If the
revertible option is not enabled, the default behavior will remain the same. 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 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 and revertible option
Short-path forwarding enables the short path forwarding on an IPV6 VRRP-E device. It will revert
back to standard behavior (no short-path forwarding) temporarily even if short-path forwarding is
configured.
Configuration considerations
• VRRP-E virtual MAC will be synced and learned on ICL ports on backup routers through the ICL.
• ICL ports must be member ports of VLANs that CCEP ports are members of.
• VRRP or VRRP-E master router will be broadcast hello packets to all VLAN member ports
including ICL ports. Normal VLAN FID will be used for broadcasting.