Redistribution into OSPF

[Jeremy Guiles]

Hello Everyone,

I have been experimenting with Multi-Area OSPF and Redistribution in preparation for the CCNP ROUTE test. Redistributing routes into OSPF seems to be easy enough but the external routes only show up in Area 0. Can anybody tell me what I am missing?

Thanks

[KARUPPUCHAMY MALAIYANDI]

Hi,

Can you paste the output of the below commands from Area 0 rotuer as other Area router too

#sh run | sec ospf

#sh ip ospf database

Thanks

Karuppu

[Jeremy Guiles]

Here are the outputs

ABR:

router ospf 27
log-adjacency-changes
network 172.16.0.0 0.0.0.31 area 0
network 3.0.0.0 0.255.255.255 area 0
network 172.16.0.128 0.0.0.127 area 3
network 172.16.1.0 0.0.0.3 area 34

Router Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum Link count
2.2.2.2         2.2.2.2         3552        0x8000000e 0x00feff 1
3.3.3.3         3.3.3.3         1581        0x80000007 0x00feff 2
7.7.7.7         7.7.7.7         1585        0x80000005 0x00feff 1
4.4.4.4         4.4.4.4         1202        0x8000000f 0x0076d2 2

                Net Link States (Area 0)
Link ID         ADV Router      Age         Seq#       Checksum
172.16.0.1      7.7.7.7         1580        0x80000011 0x000dbd

                Summary Net Link States (Area 0)
Link ID         ADV Router      Age         Seq#       Checksum
172.16.1.0      3.3.3.3         223         0x80000007 0x00fc01
172.16.0.32     7.7.7.7         1575        0x80000002 0x00feff
172.16.0.64     4.4.4.4         1188        0x80000003 0x0093fa
172.16.0.128    3.3.3.3         915         0x80000006 0x00a7e7

                Router Link States (Area 3)

Link ID         ADV Router      Age         Seq#       Checksum Link count
3.3.3.3         3.3.3.3         1796        0x80000002 0x00912d 1
172.16.0.130    172.16.0.130    1796        0x80000002 0x004117 1

                Net Link States (Area 3)
Link ID         ADV Router      Age         Seq#       Checksum
172.16.0.129    3.3.3.3         1796        0x80000001 0x00e181

                Summary Net Link States (Area 3)
Link ID         ADV Router      Age         Seq#       Checksum
172.16.0.0      3.3.3.3         1643        0x80000009 0x00f007
3.3.3.3         3.3.3.3         1643        0x8000000a 0x00f007
4.4.4.4         3.3.3.3         1643        0x8000000b 0x00ef08
172.16.0.32     3.3.3.3         1643        0x8000000c 0x00f007
172.16.1.0      3.3.3.3         224         0x8000000e 0x00f405
172.16.0.64     3.3.3.3         1643        0x8000000d 0x00f007

                Router Link States (Area 34)

Link ID         ADV Router      Age         Seq#       Checksum Link count
172.16.1.2      172.16.1.2      2326        0x8000c3f0 0x0065a7 2
3.3.3.3         3.3.3.3         231         0x8000000b 0x00feff 2

                Summary Net Link States (Area 34)
Link ID         ADV Router      Age         Seq#       Checksum
172.16.0.0      3.3.3.3         1645        0x80000007 0x00f405
3.3.3.3         3.3.3.3         1645        0x80000008 0x00f405
4.4.4.4         3.3.3.3         1645        0x80000009 0x00f306
172.16.0.32     3.3.3.3         1645        0x8000000a 0x00f405
172.16.0.128    3.3.3.3         1645        0x8000000c 0x00f405
172.16.0.64     3.3.3.3         1185        0x8000000d 0x002028

                Type-5 AS External Link States
Link ID         ADV Router      Age         Seq#       Checksum Tag
2.2.2.2         2.2.2.2         3552        0x80000009 0x00f007 0
7.7.7.7         2.2.2.2         3552        0x8000000a 0x00f007 0
192.168.27.0    2.2.2.2         3552        0x8000000b 0x00f007 0
192.168.27.4    2.2.2.2         3552        0x8000000c 0x00f007 0
2.2.2.2         7.7.7.7         1058        0x80000011 0x00ec09 0
7.7.7.7         7.7.7.7         1058        0x80000012 0x00ec09 0
8.8.8.8         7.7.7.7         1049        0x80000013 0x00f007 0
9.9.9.9         7.7.7.7         1049        0x80000014 0x00f007 0
10.10.10.10     7.7.7.7         1049        0x80000015 0x00f007 0
11.11.11.11     7.7.7.7         1049        0x80000016 0x00f007 0
192.168.27.0    7.7.7.7         1049        0x8000001a 0x00ea0a 0
192.168.27.4    7.7.7.7         1049        0x8000001c 0x00e80b 0
192.168.27.4    7.7.7.7         3426        0x80000004 0x00da41 0
192.168.27.0    7.7.7.7         1050        0x80000019 0x00ec09 0

Area 34 Router:

router ospf 27
log-adjacency-changes
network 172.16.1.0 0.0.0.3 area 34

            Router Link States (Area 34)

Link ID         ADV Router      Age         Seq#       Checksum Link count
172.16.1.2      172.16.1.2      2768        0x8000c3f0 0x0065a7 2
3.3.3.3         3.3.3.3         675         0x8000000b 0x00feff 2

                Summary Net Link States (Area 34)
Link ID         ADV Router      Age         Seq#       Checksum
172.16.0.64     3.3.3.3         1627        0x8000000d 0x002028
172.16.0.0      3.3.3.3         289         0x8000000e 0x00620c
3.3.3.3         3.3.3.3         289         0x8000000f 0x009da0
4.4.4.4         3.3.3.3         289         0x80000010 0x00f107
172.16.0.32     3.3.3.3         289         0x80000011 0x002525
172.16.0.128    3.3.3.3         289         0x80000012 0x009aee

                Type-5 AS External Link States
Link ID         ADV Router      Age         Seq#       Checksum Tag
2.2.2.2         7.7.7.7         1502        0x80000011 0x00ec09 0
7.7.7.7         7.7.7.7         1502        0x80000012 0x00ec09 0
9.9.9.9         7.7.7.7         1493        0x80000014 0x00f007 0
10.10.10.10     7.7.7.7         1493        0x80000015 0x00f007 0
11.11.11.11     7.7.7.7         1493        0x80000016 0x00f007 0
8.8.8.8         7.7.7.7         1488        0x80000013 0x00f007 0
192.168.27.0    7.7.7.7         1493        0x8000001a 0x00ea0a 0
192.168.27.4    7.7.7.7         1493        0x8000001c 0x00e80b 0

[KARUPPUCHAMY MALAIYANDI]

Hi,

Based on the output , below is my understanding

1.Area 3 and area 34 are connected to Area 0

2.There is one more ABR which is connecting both Area 3 and Area 34

I am able to see all the routes which you were able to see on area 0 the same routes can able to see on area 34 as well.

Area 34 perspective, the external routes can be reachable via 7.7.7.7 with higer metric so that it is installed on the ospf database table.

Also , can you tell me which routes you were able to on area 0 but not in other areas ??

Thanks

Karuppu

[Jeremy Guiles]

I can see the type 5 lsa's for the external routes in Area 34. However, they do not show up in the routing table. If I reconfigure Area 34 as a Stub Area I have no issues which I'm assuming is due to the default route being used so that does not exactly solve the problem.