INE WB I: 6.38 OSPF Filtering with Distribute-Lists

I don't have any problem with 150.1.1.1 when ping from SW2 and SW4.
However, with 150.1.2.2, packets were sent back and forth between R4 and R5.
It is caused by default route on R5 toward 2 interfaces on R4 (main Frame-relay and point-to-point serial i/f).

At this moment, I have no idea how to fix this. One of these might be a solution.
- break point-to-multipoint desing among R1 through R5 frame-relay backbone
- create direct neighbor relationship between R2 and R4, which means that R4 directly send R2 the packet coming from R5.
- simply just take out the filter on R5 which blocks to install 150.1.2.2/32 network from OSPF database. But it cannot be, because the question of 6.37 requires no change to previously configured distribute-list filter.


Traceroute from SW2
Rack1SW2#traceroute 150.1.1.1 ttl 1 4 ti 1

Type escape sequence to abort.
Tracing the route to 150.1.1.1

  1 155.1.58.5 4 msec 8 msec 4 msec
  2 155.1.0.4 12 msec 8 msec 8 msec
  3 155.1.146.1 8 msec *  28 msec
Rack1SW2#traceroute 150.1.2.2 ttl 1 4 ti 1

Type escape sequence to abort.
Tracing the route to 150.1.2.2

  1 155.1.58.5 4 msec 4 msec 8 msec
  2 155.1.0.4 4 msec 4 msec 4 msec
  3 155.1.0.5 8 msec 4 msec 8 msec
  4 155.1.0.4 8 msec 8 msec 8 mse

Routing Table on SW2
Rack1SW2#sh ip route 150.1.1.1
Routing entry for 150.1.0.0/22
  Known via "ospf 1", distance 110, metric 66, type inter area
  Last update from 155.1.58.5 on Vlan58, 01:09:10 ago
  Routing Descriptor Blocks:
  * 155.1.58.5, from 150.1.5.5, 01:09:10 ago, via Vlan58
      Route metric is 66, traffic share count is 1

Rack1SW2#sh ip route 150.1.2.2
Routing entry for 150.1.0.0/22
  Known via "ospf 1", distance 110, metric 66, type inter area
  Last update from 155.1.58.5 on Vlan58, 01:09:14 ago
  Routing Descriptor Blocks:
  * 155.1.58.5, from 150.1.5.5, 01:09:14 ago, via Vlan58
      Route metric is 66, traffic share count is 1

Routing Table on R5 and R4

 Rack1R5#sh ip route 150.1.1.1
% Subnet not in table
Rack1R5#sh ip route 0.0.0.0
Routing entry for 0.0.0.0/0, supernet
  Known via "ospf 1", distance 110, metric 1, candidate default path
  Tag 1, type extern 2, forward metric 64
  Last update from 155.1.45.4 on Serial0/1, 00:11:17 ago
  Routing Descriptor Blocks:
    155.1.45.4, from 150.1.4.4, 00:11:17 ago, via Serial0/1
      Route metric is 1, traffic share count is 1
      Route tag 1
  * 155.1.0.4, from 150.1.4.4, 00:11:17 ago, via Serial0/0
      Route metric is 1, traffic share count is 1
      Route tag 1


Rack1R4#sh ip route 150.1.2.2
Routing entry for 150.1.2.2/32
  Known via "ospf 1", distance 110, metric 129, type intra area
  Redistributing via rip
  Advertised by rip metric 1
  Last update from 155.1.0.5 on Serial0/0, 20:57:31 ago
  Routing Descriptor Blocks:
  * 155.1.45.5, from 150.1.2.2, 20:57:31 ago, via Serial0/1
      Route metric is 129, traffic share count is 1
    155.1.0.5, from 150.1.2.2, 20:57:31 ago, via Serial0/0
      Route metric is 129, traffic share count is 1

R5's configuration

router ospf 1
 router-id 150.1.5.5
 log-adjacency-changes
 no discard-route internal
 area 0 range 150.1.0.0 255.255.252.0
 distribute-list 12 in
!
access-list 12 deny   150.1.1.1
access-list 12 deny   150.1.2.2
access-list 12 permit any