BGP - updates back to the originator?

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Nov 20th, 2007
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I am a little bit confused regarding when BGP peers send a routing update back to the originator. I tried different scenarios and noticed that in some of them the eBGP neighbor sends back a routing update back to the local router and in some cases it does not. Could you please clarify when this should happen and why?

When I debugged bgp updates (debug ip bgp updates), I noticed the following (this is an update sent back to the originator):

*Mar 1 00:04:07.959: BGP(0): rcv UPDATE w/ attr: nexthop, origin i, originator, path 2 1, community , extended community

*Mar 1 00:04:07.971: BGP(0): rcv UPDATE about -- DENIED due to: AS-PATH contains our own AS;

The results from the sniffed packets do not show any community or extended community attribute in the path attributes.

Could you please clarify the cause for this result?

Thank you.



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