Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 - Manual (Page 430)

412 Brocade ICX 6650 Layer 3 Routing Configuration Guide
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VRRP and VRRP-E overview
NOTE
The maximum number of supported VRRP or VRRP-E router instances is 254 for IPv4 environments.
The maximum number of supported VRRP or VRRP-E router instances is 128 for IPv6 environments.
For a summary of how these two router redundancy protocols differ, refer to “Comparison of VRRP
and VRRP-E” on page 420.
VRRP and VRRP-E overview
The following sections describe VRRP and VRRP-E. The protocols both provide redundant paths for
IP addresses. However, the protocols differ in a few important ways. For clarity, each protocol is
described separately.
VRRP overview
Virtual Router Redundancy Protocol (VRRP) provides redundancy to routers within a LAN. VRRP
allows you to provide alternate router paths for a host without changing the IP address or MAC
address by which the host knows its gateway. Consider the situation shown in
Figure 30 .
FIGURE 30 Switch 1 is the Host1 default gateway but is a single point of failure
Switch 1 is the host default gateway out of the subnet. If this interface goes down, Host1 is cut off
from the rest of the network. Switch 1 is thus a single point of failure for Host1’s access to other
networks.
Host1
Default Gateway
192.168.5.1
Internet
or
Enterprise Intranet
Internet
or
Enterprise Intranet
e 1/1/2
e 1/1/6 192.168.5.1
Switch 1 Switch 2
e 1/1/3
e 1/1/5
Switch 2