08-01-2012 01:43 AM - edited 03-07-2019 08:05 AM
Hello,
I have a problem to expose you.
I have a core switch that is a member of an OSPF area.
The neighbors of this switch are two provider routers in the same area OSPF.
Today after a migration, the provider has set up a route to the core switch in 10.160.0.0/16
The problem I have is that the core switch redistributes these routes own corresponding connected to each VLAN.
Example: 10.160.90.0/24 - 10.160.250.0/24 - etc ...
Do you know if there is a way to not to redistribute the connected routes into OSPF? Because it is useless in the OSPF because the route 10.160.0.0/16 is sufficient for all VLANs
Sincerely,
Benoit PETRY
08-01-2012 02:02 AM
Hi Petry,
You can use the passive interface concept to stop redistribution on specific interfaces.
To stop routers from becoming OSPF neighbors on a particular interface, issue the
passive-interface command at the interface.
In large enterprise networks, many of the distribution routers have more than 200 interfaces. Configuring passive-interface on each of the 200 interfaces can be difficult. The solution in such situations is to configure all the interfaces as passive by default using a single passive-interface default command. Then, configure individual interfaces where adjacencies are desired using the no passive-interface command.
Hope it helps.
Regards
08-01-2012 02:48 AM
Hi,
the passive interface in OSPF will prevent the adjacency but it won't prevent the interface where OSPF is enabled or which
fit a network command to be advertised to other neighbours as far as I know.
Regards.
Alain.
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