Backup Interface; Using Prefix Lists And Route Maps As Route Filters - Dell PowerConnect B-RX Configuration Manual

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Configuring RIP parameters
To disable split horizon and enable poison reverse on an interface, enter the command such as the
following.
BigIron RX(config-if-e10000-1/1)# ip rip poison-reverse
You can configure the device to avoid routing loops by advertising local RIP routes with a cost of 16
("infinite" or "unreachable") when these routes go down.
BigIron RX(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 device for Virtual Router Redundancy Protocol (VRRP)
or VRRP Extended (VRRPE). Refer to
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.
Router2(config)# router rip
Router2(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.
666
Chapter 17, "Configuring VRRP and VRRPE".
BigIron RX Series Configuration Guide
53-1001986-01