HP ProCurve 1600M Supplemento al manuale - Pagina 5

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HP ProCurve 1600M Supplemento al manuale

Configuring VRRP

Configuring VRRP
This section describes how to configure HP 9300M routers to use Virtual Router Redundancy Protocol (VRRP), a
standard protocol described in RFC 2338.
Details for configuring VRRP with the CLI and the Web management interface are shown. For complete syntax
information for CLI commands, see appendix B, "Command Line Interface Commands" in the HP ProCurve
9304M and 9308M Routing Switches Installation and Configuration Guide.
For information about the differences between VRRP and the Standby Router Protocol (SRP), see "Differences
Between VRRP and SRP" on page 9.

Overview of Virtual Router Redundancy Protocol (VRRP)

VRRP is a protocol that 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 1.
Figure 1
Router1 is Host1's default gateway but is a single point of failure
As shown in this example, Host1 uses 192.53.5.1 on Router1 as the host's default gateway out of the sub-net.
If this interface goes down, Host1 is cut off from the rest of the network. Router1 is thus a single point of failure for
Host1's access to other networks.
If Router1 fails, you could configure Host1 to use Router2. Configuring one host with a different default gateway
might not require too much extra administration. However, consider a more realistic network with dozens or even
hundreds of hosts per sub-net; reconfiguring the default gateways for all those hosts is impractical. It is much
simpler to configure a VRRP virtual router on Router1 and Router2 to provide a redundant path for the host(s).
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