OSPF Filtering

From: Gal Petru Cristian (cristian.gal@astral.ro)
Date: Wed May 17 2006 - 09:05:27 ART


Hi,

I have a small issue with OSPF filtering. From what I understand
distribute-list is used for filtering routes that are put in routing table
without affecting the LSDB. My current configuration is like this:

Thunder# sh run | be router ospf
router ospf 6845
 router-id 194.102.255.75
 log-adjacency-changes detail
 redistribute connected subnets
 redistribute static subnets
 network 194.102.255.0 0.0.0.255 area 0

Thunder# show ip access-lists ospf-out | be 123.1.
    630 deny 10.123.1.0, wildcard bits 0.0.0.255 (1 match)
    640 permit any (725 matches)

Thunder#show ip route 10.123.1.0
Routing entry for 10.123.1.0/24
  Known via "connected", distance 0, metric 0 (connected, via interface)
  Redistributing via ospf 6845
  Advertised by ospf 6845 subnets
  Routing Descriptor Blocks:
  * directly connected, via Bundle1
      Route metric is 0, traffic share count is 1

On the neighbor:
Vision#show ip ospf 6845 database | in 10.123.1.0
10.123.1.0 194.102.255.77 104 0x80000001 0x00B4EE 0

After I apply distribute-list ospf-out out on the Thunder machine:

Vision#show ip ospf 6845 database | in 10.123.1.0

Does it really filter outbound LSA Type 5 ? Does this apply only on area 0
or does it work on any area ? I cannot find any references on outbound
filtering, except for type 3 on ABR.

Thanks for any help.

Cristian,



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