From: Ilya Mazhara (willy@xxxxxxxxxxxxxxxx)
Date: Thu Apr 19 2001 - 07:53:36 GMT-3
Hi!
I fond that is true. And its very strange.
This config is sligtly modified BGP Example3 from Slattery&Burton book.
Router Moscow is in subAS 65200, and London & NewYork in 65000 and both
connected to Moscow.
AS100 is external domain, connected to 65200 router. They advertize
10.x.x.x into confederation.
>From London point of view:
London-R3#sh ip bgp 10.1.1.0/24
BGP routing table entry for 10.1.1.0/24, version 90
Paths: (2 available, best #2, table Default-IP-Routing-Table)
Advertised to non peer-group peers:
172.31.101.1
(65200) 100
172.31.101.1 from 172.31.101.1 (172.31.3.1)
Origin IGP, metric 0, localpref 100, valid, confed-external
<---Got directly from Moscow(65200)
(65200) 100
172.16.4.2 from 172.16.4.2 (170.10.6.1)
Origin IGP, metric 0, localpref 100, valid, internal, best <---
Yea, its seems no optimal
! than i has returned to NewYork to reestablish inter-confrderation bgp
connection to Moscow
London-R3#exi
[Connection to 172.16.4.1 closed by foreign host]
NewYork-R2#cle ip bgp e
NewYork-R2#
03:09:11: %BGP-5-ADJCHANGE: neighbor 172.31.100.1 Down User reset
03:09:30: %BGP-5-ADJCHANGE: neighbor 172.31.100.1 Up
!this new point of view 6500 sub-AS, not optimal for NewYork.
NewYork-R2#sh ip bgp 10.1.1.0/24
BGP routing table entry for 10.1.1.0/24, version 94
Paths: (2 available, best #2, table Default-IP-Routing-Table)
Flag: 0x208
Advertised to non peer-group peers:
172.31.100.1
(65200) 100
172.31.100.1 from 172.31.100.1 (172.31.3.1)
Origin IGP, metric 0, localpref 100, valid, confed-external
(65200) 100
172.16.4.1 from 172.16.4.1 (170.10.4.1)
Origin IGP, metric 0, localpref 100, valid, internal, best
<-----now London is exit point.
Why confederation paths are not considered as external?
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