From: Ahmed Mustafa (ahmed.mustafa@sbcglobal.net)
Date: Sat Feb 28 2004 - 05:22:13 GMT-3
Can someone look into this
R6 connected to R2 via ISIS level 1
R2 connected to R3 via HDLC link/ISIS Level 2
R2 connected to R3 via Frame-Relay link/OSPF-----> R2 is also doing mutual
redistribution
I announced r6 loopback interface 132.1.6.0/24 to ISIS via redistribute
connected.
R3 learned that route obviously through Frame-Relay due to lower admin
distance. I then changed the admin distance of ISIS to 106, and r3 installed
this route via ISIS. So far so good
Now comes BGP, and totally screwed this nice scenerio above
R6 is in AS 100
R2 and R3 are in AS 300
I redistributed r6 loopback now into BGP via redistribute connected, not
through network command.
r2 will obviously install this route as a BGP route because of lower
adminstrative distance External BGP 20 over ISIS 115.
Now r3 learns that route via BGP as well with the distance 200 since r2 and r3
are in same AS. I thought that the route 132.1.6.0 should have learned
through ISIS or OSPF if I removed the admin distance command of ISIS from 106
to default 115 because both OSPF and ISIS have lower admin distance than IBGP
200.
My guesses:
The route learned via BGP since it is in r2 routing table regardless of r2
should have this route in ISIS database as well as in OSPF database since r2
is also doing redistribution.
Issues: If I shut down the BGP link between r2 and r6, bingo, the route will
appear in OSPF database as an external route on r2, but when the BGP link is
up between
r2 and r6, the route will disappear from OSPF database.
Any ideas !!!
Sorry for the tedious email, but Group can learn from this and also advise.
Regards,
Ahmed
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