[47716] in North American Network Operators' Group
Routing problem
daemon@ATHENA.MIT.EDU (Arturo Lev Servin Niembro)
Fri May 10 18:07:58 2002
Date: Fri, 10 May 2002 17:07:25 -0500
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From: Arturo Lev Servin Niembro <aservin@campus.mty.itesm.mx>
To: nanog@merit.edu
Message-Id: <4F847F9A-6462-11D6-B42D-0003938EFFA2@campus.mty.itesm.mx>
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Hi,
I have a strange question because this is not very common. Lets
asume the following scenario to simplify it:
net A -- RTA --- RT1-ISP1 --- IP Cloud --- RT2-ISP1 -- RTB -- net b
--- RT1-ISP2 --- IP cloud --- RT2-ISP2 --
RTA and RTB are in differents ASs. ISP1 is preferred via BGP (local
preference). Sometimes we lost reachability between net A and net B but
we can stiil see the routes trough ISP1, so the BGP can not converge to
ISP2. The problem is because the ISP1 have troubles with their IP-MPLS
network, so, sometime they lost traffic.
Do you now about some trick that can be used to know that the path
to net b is not good despite the route is still in RTA?
I was thinking to force the loopback from ISP1 to be learned in RTA
to some route learned from RTB, but how. I think that if I make a tunnel
interface it would still depend from BGP to work and BGP depend form
tunnel, so it would not work.
Any idea that do not imply to change ISP1 nor use ISP2 as default?
Thanks in Advance,
-as
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<fixed><fontfamily><param>Courier New</param><color><param>0000,0000,0000</param><smaller>Hi,
I have a strange question because this is not very common. Lets asume
the following scenario to simplify it:
net A -- RTA --- RT1-ISP1 --- IP Cloud --- RT2-ISP1 -- RTB -- net b
--- RT1-ISP2 --- IP cloud --- RT2-ISP2 --
RTA and RTB are in differents ASs. ISP1 is preferred via BGP (local
preference). Sometimes we lost reachability between net A and net B
but we can stiil see the routes trough ISP1, so the BGP can not
converge to ISP2. The problem is because the ISP1 have troubles with
their IP-MPLS network, so, sometime they lost traffic.
Do you now about some trick that can be used to know that the path to
net b is not good despite the route is still in RTA?
I was thinking to force the loopback from ISP1 to be learned in RTA
to some route learned from RTB, but how. I think that if I make a
tunnel interface it would still depend from BGP to work and BGP depend
form tunnel, so it would not work.
Any idea that do not imply to change ISP1 nor use ISP2 as default?
Thanks in Advance,
-as
</smaller></color></fontfamily></fixed>
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