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PowerConnect B-Series FCX Configuration Guide 915
53-1002266-01
Configuring RIP parameters
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PowerConnect(config-rip-router)#update-time 120
This command configures the Layer 3 Switch to send RIP updates every 120 seconds.
Syntax: update-time <1-1000>
Enabling learning of RIP default routes
You can enable learning of RIP default routes on a global or individual interface basis.
To enable learning of default RIP routes on a global basis, enter the following command.
PowerConnect(config-rip-router)#learn-default
Syntax: [no] learn-default
To enable learning of default RIP routes on an individual interface basis, enter commands such as
the following.
PowerConnect(config)#interface ethernet 0/1/1
PowerConnect(config-if-0/1/1)#ip rip learn-default
Syntax: [no] ip rip learn-default
Configuring a RIP neighbor filter
By default, a Layer 3 Switch learns RIP routes from all its RIP neighbors. Neighbor filters allow you
to specify the neighbor routers from which the Dell PowerConnect device can receive RIP routes.
Neighbor filters apply globally to all ports.
To configure a RIP neighbor filter, enter a command such as the following.
PowerConnect(config-rip-router)#neighbor 1 deny any
This command configures the Layer 3 Switch 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 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.
PowerConnect(config-rip-router)#neighbor 2 deny 192.16.1.170
PowerConnect(config-rip-router)#neighbor 1024 permit any
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.