Re: BGP, TCP server-client

I don't think collision detection happens every time. Section 6.8 of RFC
4271 states:

"Note that a connection collision cannot be detected with connections that
are in Idle, Connect, or Active states."

I think some further debugging and packet captures would be required to
determine if the router is following the RFC or not.

On Tue, Oct 13, 2009 at 3:17 AM, Marcel Lammerse <m.lammerse_at_mac.com> wrote:

> I just labbed this up and, to my surprise, I got the same results.
> According to rfc 4271, the bgp router-id should determine which side becomes
> the server and which becomes the client during a connection collision. This
> should be a deterministic process. But in my lab it made no difference and I
> got random results. Why?
>
> The neighbor transport command seems to lock the client/server role down.
> The passive side is the server, the active side is the client.
>
>
> On 13/10/2009, at 15:57 , Marko Milivojevic wrote:
>
> Have you tried:
>>
>> neighbor X.X.X.X transport connection-mode active
>>
>> Out of curiosity - is this a lab requirement, or are you trying to do
>> something weird in real life? :-)
>>
>> --
>> Marko
>> CCIE #18427 (SP)
>> My network blog: http://cisco.markom.info/
>>
>> On Tue, Oct 13, 2009 at 03:49, ospfv2 <ospfv2_at_gmail.com> wrote:
>>
>>> Hi Experts
>>>
>>> afaik to make bgp router as tcp client, we can set the router-id
>>> higher or put update-source command. is that correct ?
>>>
>>> but i found out if we reload each of the router,sometime the client
>>> become the server.
>>> how to make the assigment permanent ?
>>>
>>> any comments ?
>>>
>>> thx
>>>
>>>
>>>
>>> R1# sh run
>>> interface FastEthernet0/0
>>> B ip address 192.168.1.1 255.255.255.0
>>>
>>> router bgp 100
>>> B no synchronization
>>> B neighbor 192.168.1.2 remote-as 200
>>> B no auto-summary
>>>
>>> R1#sh ip bgp nei | in port
>>> Local host: 192.168.1.1, Local port: 179
>>> Foreign host: 192.168.1.2, Foreign port: 11001
>>>
>>>
>>>
>>>
>>> R2#sh run
>>> interface FastEthernet0/0
>>> B ip address 192.168.1.2 255.255.255.0
>>>
>>> router bgp 200
>>> B no synchronization
>>> B neighbor 192.168.1.1 remote-as 100
>>> B neighbor 192.168.1.1 update-source FastEthernet0/0
>>> B no auto-summary
>>>
>>>
>>> R2# sh ip bgp nei | in port
>>> Local host: 192.168.1.2, Local port: 11001
>>> Foreign host: 192.168.1.1, Foreign port: 179
>>>
>>
>>
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-- 
Bryan Bartik
CCIE #23707 (R&S), CCNP
Sr. Support Engineer - IPexpert, Inc.
URL: http://www.IPexpert.com
Blogs and organic groups at http://www.ccie.net