Overview Of Xrrp Operation - HP ProCurve 5300xl Series Management Manual

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Router Redundancy Using XRRP

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.

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).

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