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New Member

bgp with ttl

Dear all,

I have configured 5 routers in same AS using IBGP in my branch. whenever i trace the last one, it directly shows the router without showing the remaining hops. How can i get the solution for viewing each hops in same IBGP routers. is there any option in BGP for the matter?

Any help will be highly appreciated.

8 REPLIES

bgp with ttl

Hi Hari,

Your question is not clear.

Can you please attach the topology and reframe your concern for better understanding.

Also, as far as I have understood (correct me, if I'm wrong); you have 5 routers at one branch, which are fully meshed with iBGP.

Regards,

Smitesh

New Member

Re: bgp with ttl

Hi smitesh!

thank you for your quick reply.

Yes, I have 5 routers in same branch using IBGP in fully mesh. I tried to

trace the last router from HO, but it showed me up the last router directly

without showing the rest routers (hops). If it doesn't make any sense

please let me know, i will try to make a design according the scenario.

Regards,

Hari

On Thu, Dec 22, 2011 at 11:45 AM, smitesh.kharecha <

bgp with ttl

Hi Hari,

Can you please attach topology.

Regards,

Smitesh

New Member

Re: bgp with ttl

Dear Smitesh

Thank you for your further interest towards my question.

I have attached the topology here,

In this topology i have included 4 routers in branch... if you provided me

the solution for those routers 5th router is not the issue.

Actually i'm tracing R4 from HO which you can see in the topology, in this

type of topology my HO router shows the ISP as the first hop then it shows

directly R4 , it is reachable but trace is hiding 3 routers R1,R2, and R3.

So, i want to see these hops as well.

For your information ,

OSPF and IBGP full mesh is running between R1,R2,R3 and R4, likewise eBGP

is running between HO-SP-R1.

I hope this scenario does make sense.

Regards,

Hari

On Thu, Dec 22, 2011 at 11:53 AM, smitesh.kharecha <

bgp with ttl

Hi Hari,

Sorry, but i still have couple of more doubts on the setup.

1. The attached topology is physical or logical ?

2. Just to confirm is iBGP fully meshed. i.e. R1 has got R2, R3, R4 as neigbours

also R2 has got R1, R3, R4 as neighbours

also R3 has got R1, R2, R4 as neigbours

also R4 has got R1, R2, R3 as neighbours

3. Have you deployed any route-reflector ?

4. Is R1 the only point of entrance in the AS ?

5. Is BGP syncronization enabled or diabled ?

6. The route which you are trying to reach, whether or R4 or R5; are you seeing that route on R1 as BGP learn route or OSPF ? (Which I believe should be OSPF)

7. Are you doing redistribution between OSPF and BGP ?

Regards,

Smitesh

New Member

Re: bgp with ttl

Dear Smitesh,

Its ok , Please check my answer and consider these informations are true.

1. The attached topology is physical or logical ?

Its physical topology

2. Just to confirm is iBGP fully meshed. i.e. R1 has got R2, R3, R4 as

neigbours

also R2 has got R1, R3, R4 as neighbours

also R3 has got R1, R2, R4 as neigbours

also R4 has got R1, R2, R3 as neighbours

Yes you are right.

3. Have you deployed any route-reflector ?

No

4. Is R1 the only point of entrance in the AS ?

Yes

5. Is BGP syncronization enabled or diabled ?

It has been disabled

6. The route which you are trying to reach, whether or R4 or R5; are you

seeing that route on R1 as BGP learn route or OSPF ? (Which I believe

should be OSPF)

Both BGP and OSPF learning the route. But internally ospf works for the

reachability what i believe. routes learned by BGP are seen as rib failure.

that means router 1 is using ospf to reach r4 even it has that route in bgp

table also.

7. Are you doing redistribution between OSPF and BGP ?

no i'm advertising the specific routes in the bgp.

Kind Regards,

Hari

New Member

Re: bgp with ttl

Dear Smitesh

No response received yet, please help me out as soon as possible.

On Thu, Dec 22, 2011 at 3:03 PM, Hari bamsha Sapkota <

bgp with ttl

Hi Hari,

I was out on project for couple of days and I wonder no other community member had ventured on this thread so fa r .

Anyways, can you share the  sanitised configs of all the routers involved, so that I can try to simulate the issue in GNS3.

Regards,

Smitesh

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