Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 351)

Multi-Service IronWare Routing Configuration Guide 323
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Configuring RIP parameters
You can configure the Brocade device to avoid routing loops by advertising local RIP routes with a
cost of 16 (“infinite” or “unreachable”) when these routes go down.
Brocade(config-rip-router)# poison-local-routes
Syntax: [no] poison-local-routes
Suppressing RIP route advertisement on a VRRP
or VRRPE backup interface
NOTE
This section applies only if you configure the Brocade device for Virtual Router Redundancy Protocol
(VRRP) or VRRP Extended (VRRPE).
Normally, a VRRP or VRRPE Backup includes route information for the virtual IP address (the
backed up interface) in RIP advertisements. As a result, other routers receive multiple paths for the
backed up interface and might sometimes unsuccessfully use the path to the Backup rather than
the path to the Master.
You can prevent the Backups from advertising route information for the backed up interface by
enabling suppression of the advertisements.
To suppress RIP advertisements for the backed up interface in Router2, enter the following
commands.
Brocade(config)# router rip
Brocade(config-rip-router)# use-vrrp-path
Syntax: [no] use-vrrp-path
The syntax is the same for VRRP and VRRPE.
Using prefix lists and route maps as route filters
You can configure prefix lists to permit or deny specific routes, then apply them globally or to
individual interfaces and specify whether the lists apply to learned routes (in) or advertised routes
(out).
You can configure route maps to permit or deny specific routes, then apply a route map to an
interface, and specify whether the map applies to learned routes (in) or advertised routes (out).
NOTE
A route is defined by the destination’s IP address and network mask.
NOTE
By default, routes that do not match a prefix list are learned or advertised. To prevent a route from
being learned or advertised, you must configure a prefix list to deny the route.
To configure a prefix list, enter commands such as the following.
Brocade(config)# ip prefix-list list1 permit 10.53.4.1 255.255.255.0
Brocade(config)# ip prefix-list list2 permit 10.53.5.1 255.255.255.0
Brocade(config)# ip prefix-list list3 permit 10.53.6.1 255.255.255.0
Brocade(config)# ip prefix-list list4 deny 10.53.7.1 255.255.255.0