Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 - Manual (Page 168)

150 Brocade ICX 6650 Layer 3 Routing Configuration Guide
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RIP parameter configuration
The following commands configure the Layer 3 Switch 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. To deny learning from a specific neighbor but allow all other neighbors, you must add a
filter that allows learning from all neighbors. Be sure to add the filter to permit all neighbors last
(the one with the highest filter number). Otherwise, the software can match on the permit all filter
instead of a filter that denies a specific neighbor, and learn routes from that neighbor.
Brocade(config-rip-router)#neighbor 2 deny 192.168.1.170
Brocade(config-rip-router)#neighbor 1024 permit any
Denying route advertisements for connected routes
By default, RIP advertises all connected routes to neighboring routers except for the management
route. To configure the router to not advertise connected routes, use the dont-advertise-connected
command. When the dont-advertise-connected command is configured, the router only sends RIP
enabled interface routes.
To configure the dont-advertise-connected command under the router RIP configuration level, enter
the router rip command.
Brocade(config)#router rip
Brocade(config-rip-router)#dont-advertise-connected
Syntax: [no] dont-advertise-connected
To disable the configuration, use the no form of the command.
Changing the route loop prevention method
RIP can use the following methods to prevent routing loops:
• Split horizon – The Layer 3 Switch does not advertise a route on the same interface as the one
on which the router learned the route.
• Poison reverse – The Layer 3 Switch assigns a cost of 16 (“infinite” or “unreachable”) to a
route before advertising it on the same interface as the one on which the router learned the
route. This is the default.
These loop prevention methods are configurable on an individual interface basis. One of the
methods is always in effect on an interface enabled for RIP. If you disable one method, the other
method is enabled.
NOTE
These methods may be used in addition to the RIP maximum valid route cost of 15.
Disabling poison reverse
To disable poison reverse and enable split horizon on an interface, enter commands such as the
following.
Brocade(config)#interface ethernet 1/1/1
Brocade(config-if-e10000-1/1/1)#no ip rip poison-reverse
Syntax: [no] ip rip poison-reverse