IP Routing Features
Configuring RIP
Changing the Route Loop Prevention Method
RIP can use the following methods to prevent routing loops:
■ Split horizon - the routing switch does not advertise a route on the same
interface as the one on which the routing switch learned the route.
■ Poison reverse - the routing switch assigns a cost of 16 (“infinity” or
“unreachable”) to a route before advertising it on the same interface as
the one on which the routing switch learned the route. This is the default.
These loop prevention methods are configurable on an individual VLAN
interface basis.
Note These methods are in addition to RIP's maximum valid route cost of 15.
Poison reverse is enabled by default. Disabling poison reverse causes the
routing switch to revert to Split horizon. (Poison reverse is an extension of
Split horizon.) To disable Poison reverse on an interface, and thereby enable
Split horizon, enter the following:
HPswitch(config)# vlan 1
HPswitch(vlan-1)# no ip rip poison-reverse
Syntax: [no] ip rip poison-reverse
Entering the command without the “no” option will re-enable Poison reverse.
Displaying RIP Information
All RIP configuration and status information is shown by the CLI command
show ip rip and options off that command. The following RIP information can
be displayed:
RIP Information Type Page
General Information
11-28
Interface Information
11-30
Peer Information
11-31
Redistribute Information
11-33
Restrict Information
11-33
11-27
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