Brocade BigIron RX Series Configuration Guide - Manual (Page 825)

BigIron RX Series Configuration Guide 747
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Configuring RIP parameters
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• Learning and advertising of RIP default routes – The device learns and advertises RIP default
routes by default. You can disable learning and advertising of default routes on a global or
individual interface basis.
• Learning of standard RIP routes – By default, the device can learn RIP routes from all its RIP
neighbors. You can configure RIP neighbor filters to explicitly permit or deny learning from
specific neighbors.
Enabling learning of RIP default routes
By default, the device does not learn default RIP routes. You can enable learning of RIP default
routes on a global or interface basis.
To enable learning of default RIP routes on a global basis, enter the following command.
BigIron RX(config-rip-router)# learn-default
Syntax: [no] learn-default
To enable learning of default RIP routes on an interface, enter commands such as the following.
BigIron RX(config)# router rip
BigIron RX(config)# interface ethernet 1/1
BigIron RX(config-if-e10000-1/1)# ip rip learn-default
Syntax: [no] ip rip learn-default
Configuring a RIP neighbor filter
By default, a device learns RIP routes from all its RIP neighbors. Neighbor filters allow you to specify
the neighbor routers from which the device can receive RIP routes. Neighbor filters apply globally to
all ports.
To configure a RIP neighbor filters, enter a command such as the following.
BigIron RX(config-rip-router)# neighbor 1 deny any
Syntax: [no] neighbor <filter-num> permit | deny <source-ip-address> | any
This command configures the device so that the device does not learn any RIP routes from any RIP
neighbors.
The following commands configure the device to learn routes from all neighbors except
192.168.1.170. Once you define a RIP neighbor filter, the default action changes from learning all
routes from all neighbors to denying all routes from all neighbors except the ones you explicitly
permit. Thus, to deny learning from a specific neighbor but allow all other neighbors, you must add
a filter that allows learning from all neighbors. Make sure you add the filter to permit all neighbors
as the last filter (the one with the highest filter number). Otherwise, the software can match on the
permit all filter before a filter that denies a specific neighbor, and learn routes from that neighbor.
BigIron RX(config-rip-router)# neighbor 2 deny 192.16.1.170
BigIron RX(config-rip-router)# neighbor 24 permit any
Changing the route loop prevention method
RIP uses the following methods to prevent routing loops:
• Split horizon – The device does not advertise a route on the same interface as the one on
which the router learned the route.