Can't ping other BGP AS

[kdespiegeleir]

Dear,

I'm trying out a configuration with BGP and OSPF. See below

I can't ping from R5 to R4 and R1 and reverse. Or is it that when I'm in another AS I can't ping? I tried to add a route to subnet 3.3.3.0/24 but it doesn't work either.

### IP ROUTE from R5 ###

      2.0.0.0/24 is subnetted, 1 subnets

B        2.2.2.0 [20/0] via 3.3.3.1, 01:17:55

      3.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C        3.3.3.0/24 is directly connected, FastEthernet1/0

L        3.3.3.2/32 is directly connected, FastEthernet1/0

      4.0.0.0/24 is subnetted, 1 subnets

B        4.4.4.0 [20/2] via 3.3.3.1, 01:14:49

### IP ROUTE from R1 ###

      2.0.0.0/24 is subnetted, 1 subnets

O IA     2.2.2.0 [110/2] via 4.4.4.2, 00:28:37, FastEthernet5/0

      4.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C        4.4.4.0/24 is directly connected, FastEthernet5/0

L        4.4.4.1/32 is directly connected, FastEthernet5/0

The configuration can be found in attachment.

I tried to add the routes/networks in BGP on the R1, R4 and R3 but the ICMP doesn't work either.

This is the show version:

R5#show version

Cisco IOS Software, 7200 Software (C7200-ADVENTERPRISEK9-M), Version 15.2(4)S3, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2013 by Cisco Systems, Inc.

Compiled Fri 19-Apr-13 05:11 by prod_rel_team

ROM: ROMMON Emulation Microcode

BOOTLDR: 7200 Software (C7200-ADVENTERPRISEK9-M), Version 15.2(4)S3, RELEASE SOFTWARE (fc1)

Thanks for the help,

Koen

[cadet alain]

Hi,

R1 and R4 have no route back to 3.3.3.0 network. you can use static routes or redistribute this connected interface into OSPF in your AS.

Regards

Alain

Don't forget to rate helpful posts.

[kdespiegeleir]

The static routes work. Thank you.

But redistribute the connected interface into OSPF doesn't seem to work. I added the bold line.

This on R3:

router ospf 1

network 2.2.2.0 0.0.0.255 area 1

network 4.4.4.0 0.0.0.255 area 0

!

router bgp 100

bgp log-neighbor-changes

redistribute ospf 1

neighbor 3.3.3.2 remote-as 200

neighbor 3.3.3.2 next-hop-self

This on R4:

router ospf 1

network 2.2.2.0 0.0.0.255 area 1

network 4.4.4.0 0.0.0.255 area 0

Probaly I'm doing something wrong.

[cadet alain · Accepted solution]

Hi,

You must get the 3.3.3.0/24 network into OSPF so here are 2 ways to achieve this.

on R3:

route-map REDIS_CONN

match interface f5/0

router os 1

redistribute connected subnets route-map REDIS_CONN

another way:

router os 1

netw 3.3.3.0 0.0.0.255 a 1

passive-interface f5/0

Regards

Alain

Don't forget to rate helpful posts.

[kdespiegeleir]

It works. Thank you very much Alain. I learned a lot. I've been checking this forum and I think your contribution is fantastic.

[cadet alain]

Hi Koen,

Thanks for rating and your kind words.

Regards

Alain