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Foundry Configuration Guide for the FESX, FSX, and FWSX
17 - 8
© Foundry Networks, Inc.
December 2005
FESX424 Router(config-rip-router)# update 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
By default, the Layer 3 Switch does not learn RIP default 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:
FESX424 Router(config-rip-router)# learn-default
Syntax:
[no] learn-default
To enable learning of default RIP routes on an interface basis, enter commands such as the following:
FESX424 Router(config)# interface ethernet 1
FESX424 Router(config-if-1)# ip rip learn-default
Syntax:
[no] ip rip learn-default
Configuring a RIP Neighbor Filter
By default, a Foundry Layer 3 Switch learns RIP routes from all its RIP neighbors. Neighbor filters allow you to
specify the neighbor routers from which the Foundry 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:
FESX424 Router(config-rip-router)# neighbor 1 deny any
Syntax:
[no] neighbor <filter-num> permit | deny <source-ip-address> | any
This command configures the Layer 3 Switch so that the device does not learn any RIP routes from any RIP
neighbors.
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. 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.
FESX424 Router(config-rip-router)# neighbor 2 deny 192.16.1.170
FESX424 Router(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.
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. 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 an interface, enter commands such as the following:
FastIron SuperX Router(config)# interface ethernet 1/1
Summary of Contents for FastIron Edge Switch X424
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