Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 614)

If the Master subsequently comes back up again, the amount of time specified by the VRRP-E slow
start timer elapses (in the IPv4 example, 30 seconds) before the Master takes over from the Backup.
The VRRP-E slow start timer is effective only if the VRRP-E Backup router detects another VRRP-E
Master (Standby) router. It is not effective during the initial bootup. The slow start timer is effective on
a Backup router if the priority of the Backup router is equal to the configured priority on the Backup
state router.
NOTE
The VRRP-E slow start timer applies only to VRRP-E configurations. It does not apply to VRRP
configurations.
VRRP-E Extension for Server Virtualization
VRRP-E is enhanced with the VRRP-E Extension for Server Virtualization feature so that the Brocade
device attempts to bypass the VRRP-E Master router and directly forward packets to their destinations
through interfaces on the Backup router.
Short-path forwarding configuration notes on page 614 shows an example of VRRP-E Extension for
Server Virtualization. As shown, the virtual servers are dynamically moved between Host Server 1 and
Host Server 2. Each time the virtual server is activated, it can be on a different Host Server, and
sometimes the traffic crosses the WAN two times before it reaches the client. For example, in the
VRRP-E implementation (without VRRP-E Extension for Server Virtualization), traffic from Virtual
server 1 to the client at 10.0.0.X was switched to the VRRP-E Master router, then routed back to the
VRRP-E Backup router, and then routed to the client (the normal forwarding path).
Short-path forwarding limitation
• Short-path forwarding (SPF) applies to IPv4 on Brocade FSX 800 and FSX 1600 platforms only.
SPF is not supported on Brocade FCX or ICX platforms.
Short-path forwarding configuration notes
• The VRRP-E Master router and Backup router must have routes to all destinations. You should
utilize dynamic routing protocols such as Open Shortest Path First (OSPF) on all routers; otherwise,
you must configure the static routes.
• Although it is not required, it is recommended that interfaces on different routers with the same
VRID have the same SPF configuration. This ensures that the SPF behavior is retained after a
failover. Different VRIDs, however, can have different SPF configurations.
VRRP-E Extension for Server Virtualization
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