RE: Re: BGP local-as posted 12/10/2006
I did test these too, it did not work for me as well.
Somehow the far end's mis-configured AS number is not in any of the messages
I am receiving.
I can not catch what is the AS number he is expecting from me. I assume my
BGP process is happy because my config and the far end AS number is correct.
The far end BGP is not happy, and it know the local config and what is
receiving from me, and compares the data, and outputs the expected keyword.
But from my end, I can not see the expected info from me.
Thanks for the emails.
From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx]On Behalf Of
Sent: Sunday, December 10, 2006 10:40 AM
To: Nick Griffin
Cc: Ivan; ccielab@xxxxxxxxxxxxxx; CharlesB
Subject: Re: BGP local-as
it is not work in my test :(
r1(AS 111) ----- r2(AS 115)
R1 --- initiate bgp session
router bgp 111
neighbor 220.127.116.11 remote-as 215 -- try establish session with AS 215
neighbor 18.104.22.168 ebgp-multihop 255
neighbor 22.214.171.124 update-source Loopback0
router bgp 115
neighbor 126.96.36.199 remote-as 111
neighbor 188.8.131.52 transport connection-mode passive
neighbor 184.108.40.206 ebgp-multihop 255
neighbor 220.127.116.11 update-source Loopback0
So I SEE on R2 next log:
*Nov 9 00:38:28.228: tcp0: I ESTAB 18.104.22.168:34382 22.214.171.124:179 seq
DATA 45 ACK 4131500569 PSH WIN 16384
*Nov 9 00:38:28.240: tcp0: O ESTAB 126.96.36.199:34382 188.8.131.52:179 seq
DATA 64 ACK 2022725038 PSH WIN 16339
*Nov 9 00:38:28.248: tcp0: I ESTAB 184.108.40.206:34382 220.127.116.11:179 seq
DATA 23 ACK 4131500633 PSH WIN 16320
*Nov 9 00:38:28.248: %BGP-3-NOTIFICATION: received from neighbor 18.104.22.168
2/2 (peer in wrong AS) 2 bytes 0073
0073 = 115
BUT I need see D7 === 215
Do you have any ideas ?
Sunday, December 10, 2006, 6:08:11 PM, you wrote:
> Perhaps an easier way to force the opposite peer to become the tcp server
> regards to the bgp, less margin for error this way:
> router bgp 300
> no synchronization
> bgp log-neighbor-changes
> neighbor 192.168.12.2 remote-as 200
> neighbor 192.168.12.2 transport connection-mode passive <---------
> no auto-summary
> This can also be done in a peer session template versus per neighbor.
> On 12/10/06, Ivan <ivan@xxxxxxx> wrote:
>> You must force the remote peer to initiate BGP-session. Then in error
>> you see AS-number wich expect from you.
>> To achieve this try to apply outbound access-list to interface directed
>> remote peer
>> access-list 150 deny ip host BGP_IP_ORIGIN host BGP_IP_PEER eq bgp
>> access-list 150 permit ip any any
>> On Sunday 10 December 2006 11:53, CharlesB wrote:
>> > I am doing a task in IE labs.
>> > The task says, far end router admin mis-configured BGP AS number, and
>> > can not correct it now. Find a solution to peer with their router.
>> > And they indicate the far end configured AS, so we can put the local-as
>> > to match with their config.
>> > Now, what if, we do not know what they put there.
>> > I keep using debug ip bgp on my end, but I can not see the info. I put
>> > my router wrong target AS number, wrong local-as etc. The result is
>> > is hard to figure out what AS they are expecting from me.
>> > If I go to far end and do the same debug I can see what was expected AS
>> > from me in that router, but this does not help the case I am trying to
>> > figure out.
>> > Am I missing something here?
>> > May be there is no solution to this? We must know their mistake, is
>> > correct?
>> > Any thoughts?
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