From: Herbert Maosa (asawilunda@googlemail.com)
Date: Wed Aug 15 2007 - 07:00:03 ART
Distribute List in OSPF does not stop LSA from coming into the OSPF
Database. Distribute List in OSPF only filters routes that are already in
the database from being installed in the routing table. You can not filter
routes this way because LSAs do not advertise routes ( OSPF is link states
). LSAs describe link states.
So your filter is saying do not install the OSPF routes matched by
access-list 111 in the routing table from the OSPF database if those routes
arrived from Fa0/1.
Herbert.
On 8/15/07, NITIN NITIN <ccie_study_123@yahoo.com> wrote:
>
> Hi Group,
>
>
> I'm again struck ,,, :)
>
> I'm doing filtering on a router R5
> Flteing some routes via R5 ----
> i see routes filted but they dont come in routing table via R2 altought
> in
> OSPF database table??????
>
> all router OSPF AREA 0 configured
>
> R5 Fa1/0 --------SW2------R2
> | |
> SE2/0.1 p-2-p Ser 2/0
> | |
> ======================
>
>
> Rack1R5
> FastEthernet0/0 204.12.1.5
> FastEthernet1/0 137.1.58.5
> Serial2/0 unassigned
> Serial2/0.1 137.1.15.5
> Serial2/0.2 137.1.25.5
> Serial2/0.4 137.1.45.5
> Loopback0 150.1.5.5
>
> R5----
>
> router ospf 1
> router-id 150.1.5.5
> log-adjacency-changes
> network 137.1.25.5 0.0.0.0 area 0
> network 137.1.58.5 0.0.0.0 area 0
> network 150.1.5.5 0.0.0.0 area 0
> distribute-list 111 in FastEthernet1/0
> !
> ip classless
> no ip http server
> !
> !
> access-list 111 deny ip host 137.1.58.8 137.1.28.0 0.0.0.255
> access-list 111 deny ip host 137.1.58.8 150.1.2.0 0.0.0.255
> access-list 111 permit ip any any
> Rack1R5# sh ip route ospf
> 150.1.0.0/16 is variably subnetted, 2 subnets, 2 masks
> O 150.1.8.8/32 [110/2] via 137.1.58.8, 00:02:37, FastEthernet1/0
> Rack1R5#sh ip ospf database
> OSPF Router with ID (150.1.5.5) (Process ID 1)
> Router Link States (Area 0)
> Link ID ADV Router Age Seq# Checksum Link count
> 150.1.2.2 150.1.2.2 949 0x80000005 0x00E28D 4<<
> 150.1.5.5 150.1.5.5 170 0x80000008 0x0025F3 4
> 150.1.8.8 150.1.8.8 171 0x80000008 0x00B66C 3
> Net Link States (Area 0)
> Link ID ADV Router Age Seq# Checksum
> 137.1.28.2 150.1.2.2 949 0x80000001 0x008A28<<<
> 137.1.58.8 150.1.8.8 171 0x80000001 0x00D5A6<<<<
> Rack1R5#
>
> Rack1R2#sh ip ospf interface brief
> Interface PID Area IP Address/Mask Cost State Nbrs F/C
> Lo0 1 0 150.1.2.2/24 1 LOOP 0/0
> Fa0/0 1 0 137.1.28.2/24 1 DR 1/1
> Se2/0 1 0 137.1.25.2/24 64 P2P 1/1
> Rack1SW2#sh ip ospf interface brief
> Interface PID Area IP Address/Mask Cost State Nbrs F/C
> Fa1/5 1 0 137.1.58.8/24 1 DR 1/1
> Vl28 1 0 137.1.28.8/24 1 BDR 1/1
> Lo0 1 0 150.1.8.8/24 1 LOOP 0/0
> Rack1R5#sh ip ospf interface brief
> Interface PID Area IP Address/Mask Cost State Nbrs F/C
> Fa1/0 1 0 137.1.58.5/24 1 BDR 1/1
> Lo0 1 0 150.1.5.5/24 1 LOOP 0/0
> Se2/0.2 1 0 137.1.25.5/24 64 P2P 1/1
>
> WHEN I SHUT THE INTERFACE TO SW2 ------
> I get routes
> Rack1R5#sh ip route ospf
> 150.1.0.0/16 is variably subnetted, 2 subnets, 2 masks
> O 150.1.8.8/32 [110/2] via 137.1.58.8, 00:08:08, FastEthernet1/0
> Rack1R5#conf t
> Rack1R5(config)#int fa 1/0
> Rack1R5(config-if)#shutdown
> Rack1R5(config-if)#^Z
> Rack1R5#sh ip route ospf
> 137.1.0.0/16 is variably subnetted, 7 subnets, 2 masks
> O 137.1.28.0/24 [110/65] via 137.1.25.2, 00:00:00, Serial2/0.2
> O 137.1.58.0/24 [110/66] via 137.1.25.2, 00:00:00, Serial2/0.2
> 150.1.0.0/16 is variably subnetted, 3 subnets, 2 masks
> O 150.1.8.8/32 [110/66] via 137.1.25.2, 00:00:00, Serial2/0.2
> O 150.1.2.2/32 [110/65] via 137.1.25.2, 00:00:00, Serial2/0.2
>
>
> PLEASE ADVISE AND HELP AS YOU U ALL ALWAYS DO ????
>
>
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-- Kindest regards, hm
This archive was generated by hypermail 2.1.4 : Sat Sep 01 2007 - 11:32:11 ART