From: NITIN NITIN (ccie_study_123@yahoo.com)
Date: Wed Aug 15 2007 - 07:16:35 ART
Hey Thanks,
This is really helpful... just help me with 2 small further querries-----
1 more clarification why these routes get installed from SErial as next hop when I change serial cost to 1?
2. my requirement is --- not to install routes ( x, y ) from ospf database to routing table coming from Fa1/0.........so that they come from ser2/0.1 ( WITHOUT CHANGING COST )??
Regards
Herbert Maosa <asawilunda@googlemail.com> wrote: 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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