Router Redundancy Using XRRP
Overview of XRRP Operation
Overview of XRRP Operation
XRRP allows you to configure pairs of switches to behave as backup routers
for each other. Each pair of routers configured to operate this way is defined
as a Protection Domain. (You can use the switches covered in this manual in
any combination to create a Protection Domain.) If either router in the
Protection Domain fails for whatever reason, the other router automatically
takes over the routing function of the failed router. This transfer of the routing
function is transparent to the host computers that are using the routers.
Note To accomplish this transfer, both routers in the Protection Domain must have
identical network access so that each can get to all the same subnets and the
same end nodes without going through each other.
Figure 12-1 shows an example of a Protection Domain being used to provide
redundant connectivity between some clients and the network servers that
the hosts need to access. As part of the XRRP configuration, you define the
identity of the Protection Domain. In figure 1, it is Domain 2. See “Configuring
XRRP” on
page 12-11 for information on how to configure XRRP.
Figure 12-1. XRRP Protection Domain
The clients are connected to the routers through a Layer 2 switch (in this case
an HP Procurve Switch 4108gl).
12-3
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