Re: BGP Question

From: Fahad Khan (fahad.khan@gmail.com)
Date: Fri Aug 22 2008 - 10:18:17 ART

Hi Roger,

Cisco IOS implementation of route reflector functionality supports the bgp
cluster-id parameter, which is used in the Cluster list attribute instead of
the Router ID. The cluster-id parameter is useful in redundant route
reflector scenarios where multiple route reflectors serve the same set of
clients, but can lead to partial connectivity when multiple IBGP sessions
are disrupted.

The revised BGP route selection rules ensure that a route reflector in a
cluster always prefers route from a client (with shorter Cluster list) over
a reflected route, thus making the bgp cluster-id parameter obsolete. You
should not use the bgp cluster-id in new designs to increase the resilience
of your network.

regards,

On 8/22/08, Roger RPF <rpf@bluemail.ch> wrote:
>
> Hi Marvin,
>
> Thanks for your answer!
> Good to know that in the lab-exam, something in the question will point out
> to use local-as or confed. In the workbooks which I'm currently using, most
> of the time it is assumed that if there are private AS-number, they have to
> be "translated" (confed, local-as).
>
> regards
>
> Roger
>
> -----Urspr|ngliche Nachricht-----
> Von: Marvin Greenlee [mailto:mgreenlee@ipexpert.com]
> Gesendet: Freitag, 22. August 2008 13:39
> An: 'Roger RPF'; 'Cisco certification'
> Betreff: RE: BGP Question
>
> 1. Unless there is something in the question that specifically makes you
> think you need to manually set the cluster ID, you can just let the router
> choose.
>
> 2. Do not assume confed or local-as only based on the particular AS
> numbers
> given. There will be some guidance in the question if you need to
> configure
> one or both of those features.
>
> Marvin Greenlee, CCIE #12237 (R&S, SP, Sec)
> Senior Technical Instructor - IPexpert, Inc.
> Telephone: +1.810.326.1444
> Fax: +1.810.454.0130
> Mailto: mgreenlee@ipexpert.com
>
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Roger RPF
> Sent: Friday, August 22, 2008 6:52 AM
> To: 'Cisco certification'
> Subject: BGP Question
>
> Hi Group,
>
> I have two generic BGP questions, related to the lab-exam.
>
> 1: When you configure a RR-Cluster, do you configure the bgp cluster-id
> manually or do you let the router choose by itself, using his own
> router-id?
>
> 2: If you find in a scenario private and public AS numbers, do you
> automatically setup confederation or local as for the private AS number, to
> "convert" it to a public AS in order to peer with the other public AS?
>
> How is that in the LAB-test? Should we automatically do these two steps?
>
> Thanks in advance
>
> Roger
>
>
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>
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>
>
> 

-- 
*FAHAD KHAN

BE Computer Systems NED,

CCNA,CCDA,CCNP,FOUNDFE,CLSE,QOS,JNCIA,JNCIS,MCP,CCIE  (Written)

Systems Support Engineer, Premier Systems (Pvt) limited,

Karachi, Pakistan

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