From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Wed Sep 27 2006 - 13:13:32 ART
From the DocCD:
Origin Attribute
The origin attribute indicates how BGP learned about a particular route.
The origin attribute can have one of three possible values:
* IGP-The route is interior to the originating AS. This value is set
when the network router configuration command is used to inject the
route into BGP.
* EGP-The route is learned via the Exterior Border Gateway Protocol
(EBGP).
* Incomplete-The origin of the route is unknown or learned in some
other way. An origin of incomplete occurs when a route is redistributed
into BGP.
http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/bgp.htm#1020595
HTH,
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
msaeed@uaeu.ac.ae
Sent: Wednesday, September 27, 2006 9:25 AM
To: ccielab@groupstudy.com
Subject: BGP Question
Hi all,
I advertised 174.1.1.0/24 network in BGP on R1, when I see sh ip bgp
174.1.1.0 on R4 it mentions Origin IGP, can any one tell me why origin
is IGP when route is advertised and learned via BGP? Both R1 and R4 are
in same AS of BGP.
Rack1R4#sh ip bgp 174.1.1.0
BGP routing table entry for 174.1.1.0/24, version 17
Paths: (1 available, best #1, table Default-IP-Routing-Table) Not
advertised to any peer Local
174.1.145.1 from 174.1.145.1 (150.1.1.1) Origin IGP, metric 0, localpref
100, valid, confed-internal, best
Regards,
Mohammad Zahid Saeed
This archive was generated by hypermail 2.1.4 : Sun Oct 01 2006 - 16:55:41 ART