Creating Redistribution Policies And Filters - Alcatel OmniSwitch 6600 Family Configuration Manual

Configuring OSPF

Creating Redistribution Policies and Filters

Redistribution in OSPF controls the way routes are learned and distributed in the OSPF network. Non
OSPF routers can be advertised into the OSPF network as AS-external or NSSA-external routes. NSSA-
external routes are advertised only in OSPF-NSSA areas. Redistribution policies are set on Autonomous
System Boundary Routers (ASBRs) and control how routes from outside the Autonomous System (AS)
are learned and distributed. Redistribution Filters are set on any OSPF router and control how routes on
the router are distributed to other routers in the OSPF network.
To set up redistribution on a router:
1 Specify the router as an ASBR, as described in
on page 1-26. (For redistribution policies only.)
2 Enable redistribution, as described in
3
Create a redistribution policy or filter, as described in
and "Creating a Redistribution Filter" on page
Specifying an Autonomous System Boundary Router
Redistribution policies can only be created on ASBRs. ASBRs are routers that are directly connected to a
network outside of the AS (e.g., the internet). To configure a router to be an ASBR, enter the
command at the CLI prompt, as shown:
-> ip ospf asbr
You can check to see if a router is an ASBR router by using the
Enabling Redistribution
Before using any type of redistribution policy or filter, you must enable redistribution on the router, using
the ip ospf redist status
shown:
-> ip ospf redist status enable
To disable redistribution, enter the command as shown:
-> ip ospf redist status disable
page 1-26
"Enabling Redistribution" on page
1-27.
command. To enable redistribution, enter the command at the CLI prompt as
OmniSwitch 6600 Family Advanced Routing Configuration Guide
"Specifying an Autonomous System Boundary Router"
"Creating A Redistribution Policy" on page 1-27
show ip ospf
Configuring OSPF
1-26.
ip ospf asbr
command.
March 2005