From: Victor Cappuccio (cvictor@protokolgroup.com)
Date: Sun Apr 23 2006 - 20:10:38 GMT-3
Hello All
R1 in an AS 300 that is a dual homed system, lets say
Router 1 in Remote-as 300
Router 1 neighbor R2 in remote-as 200
Router 1 neighbor R3 in remote-as 200
Now the link between R1 and R3 is very slow, but the administrator of AS
200 had set a Local Pref to 400 in R3 and 200 in R2.. Just for example. -
Not real world situation. - but it could happen ;)
Is there any way I could override this situation??
Rack1R2#show ip bgp 88.88.88.0
BGP routing table entry for 88.88.88.0/24, version 43
Paths: (2 available, best #1, table Default-IP-Routing-Table)
Flag: 0x820
Advertised to update-groups:
1
300 300 301, (Received from a RR-client)
164.1.23.3 from 164.1.23.3 (10.3.3.3)
Origin IGP, metric 100, localpref 400, valid, internal, best
300
164.1.12.1 from 164.1.12.1 (10.1.1.1)
Origin IGP, metric 200, localpref 100, valid, external
Ok the BGP decision process goes like this Next Hop Reachable? -> Weight
-> Local Pref -> AS-PATH -> MED -> External (EBGP) is better than
confederation external, which is better than IBGP
But … lets look it this way, I’m the customer of As 200 and
the administrators are very busy. is there any way to deal with this
issue ? (beside shutting down my neighbor relation to R3) Also for other
good reasons the internal network of AS 200 (which I do not concern) is
using more Links to get to my AS 300
Thanks
Victor.-
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