[c-nsp] BGP Community-MED [7:137451]

[sony.scaria at gmail.com]

Metric will be carried into an AS, but will not pass it to a 3rd AS. When the same update is carried to the 3rd AS, the MED value is set to 0.

Ps: an optional non transitive attribute must be deleted by a router that has not implemented the attribute.

Sony.
------Original Message------
From: R.B. Kumar
Sender: nobody at groupstudy.com
To: cisco at groupstudy.com
ReplyTo: R.B. Kumar
Subject: BGP Community-MED [7:137451]
Sent: Nov 10, 2009 16:56

Hi Friends,

A basic CCNA level query. Hope you experts donot bother to help me on this

I know that BGP MED is having OPTIONAL NON-TRANSITIVE attribute. But I also
know that MED is capable of moving to immediate next neighbour AS.
MED is a hint to external neighbors about the preferred path into an
autonomous system (AS) that has multiple entry points

But since it is passing to next AS, How it is catagorized as NON-TRANSITIVE
? Since it is seen in neighbour AS, I thought it should be TRANSITIVE .  But
to my surprise it is OPTIONAL NON-TRANSITIVE

Please help me where i have understood wrongly

regards & Thanks in advance

RBK




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