Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 - Manual (Page 460)

442 Brocade ICX 6650 Layer 3 Routing Configuration Guide
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Additional VRRP and VRRP-E parameter configuration
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.
Figure 33 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 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.