Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 804)

776 Multi-Service IronWare Routing Configuration Guide
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Overview of VRRP
FIGURE 40 Router1 and Router2 configured as VRRP virtual routers for redundant network
access for Host1
With VRRP, you configure virtual routers that span across the physical routers. A virtual router acts
as a default router for hosts on a shared LAN. For example,
Figure 40 has one virtual router
configured (identified as VRID1).This virtual router ID (VRID) is associated with Router1 and
Router2.
Because there is more than one IP address configured on Router1 and Router2, one of the physical
addresses is assigned to the virtual router. For example, in
Figure 40 , IP address 192.53.5.1, the IP
address assigned to Router1’s interface 1/6, is assigned as the IP address of virtual router VRID1.
Router1 becomes the “Owner” of the virtual router VRID1 and is the router that responds to
packets addressed to any of the IP addresses in virtual router VRID1.
One router in the virtual router is elected as the Master router. Other routers act as backups. The
Master router is the one that forwards packets sent to the IP addresses in the virtual router and
answers ARP requests for these IP addresses. The Backup router takes over for the Master router if
the Master router fails.
NOTE
You can provide more redundancy by also configuring a second VRID with Router2 as the Owner and
Router1 as the Backup. This type of configuration is sometimes called Multigroup VRRP.