Define Redistribution Filters - Foundry Networks Switch and Router Installation And Configuration Manual

Foundry Switch and Router Installation and Configuration Guide

Define Redistribution Filters

Route redistribution imports and translates different protocol routes into a specified protocol type. On Foundry
routers, redistribution is supported for static routes, OSPF, RIP, and BGP4. When you configure redistribution for
RIP, you can specify that static, OSPF, or BGP4 routes are imported into RIP routes. Likewise, OSPF
redistribution supports the import of static, RIP, and BGP4 routes into OSPF routes. BGP4 supports redistribution
of static, RIP, and OSPF routes into BGP4.
NOTE: The Layer 3 Switch advertises the default route into OSPF even if redistribution is not enabled, and even
if the default route is learned through an IBGP neighbor. IBGP routes (including the default route) are not
redistributed into OSPF by OSPF redistribution (for example, by the OSPF redistribute command).
In Figure 17.7 on page 17-27, an administrator wants to configure the BigIron Layer 3 Switch acting as the ASBR
(Autonomous System Boundary Router) between the RIP domain and the OSPF domain to redistribute routes
between the two domains.
NOTE: The ASBR must be running both RIP and OSPF protocols to support this activity.
To configure for redistribution, define the redistribution tables with deny and permit redistribution filters.
• If you are using the CLI, use the deny and permit redistribute commands for OSPF at the OSPF router level.
• If you are using the Web management interface, click on the plus sign next to Configure in the tree view, click
on the plus sign next to OSPF, then select the Redistribution Filter link from the OSPF configuration sheet.
NOTE: Do not enable redistribution until you have configured the redistribution filters. If you enable
redistribution before you configure the redistribution filters, the filters will not take affect and all routes will be
distributed.
17 - 26 December 2000