Enabling learning of RIP default routes
By default, the Brocade 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.
device(config-rip-router)# learn-default
Syntax:
[no] learn-default
To enable learning of default RIP routes on an interface, enter the ip rip learn-default command.
device(config)# interface ethernet 1/1/1
device(config-if-e10000-1/1/1)# ip rip learn-default
Syntax:
[no] ip rip learn-default
Configuring a RIP neighbor filter
By default, a Brocade device learns RIP routes from all its RIP neighbors. Neighbor filters allow you to specify the neighbor routers from
which the Brocade device can receive RIP routes. Neighbor filters apply globally to all ports.
To configure a RIP neighbor filters, enter the
neighbor
command.
device(config-rip-router)# neighbor 1 deny any
This command configures the Brocade device so that the device does not learn any RIP routes from any RIP neighbors.
Syntax:
[no] neighbor
filter-num
{
permit
|
deny
} {
source-ip-address
|
any
}
The following commands configure the Brocade device to learn routes from all neighbors except 10.70.12.104. 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.
device(config-rip-router)# neighbor 2 deny 10.70.12.104
device(config-rip-router)# neighbor 64 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 Brocade device learned the
route. This is the default.
•
Poison reverse - The device assigns a cost of 16 ("infinite" or "unreachable") to a route before advertising it on the same
interface as the one on which the Brocade device learned the route.
These loop prevention methods are configurable on a global basis as well as on an individual interface basis. One of the methods is
always in effect on an interface enabled for RIP. Thus, if you disable one method, the other method is enabled.
NOTE
These methods are in addition to RIP’s maximum valid route cost of 15.
To disable poison reverse and enable split horizon on a global basis, enter the following command.
device(config-rip-router)# no poison-reverse
Configuring RIP parameters
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