From: Dr. Seuss (greeneggsandham4@hotmail.com)
Date: Wed Jan 14 2009 - 12:01:06 ARST
I've been playing around with default routes in ISIS the last couple of days,
and I've searched through the archives for more info. My topology is simple:
Router6 is a L1/L2 router with an ethernet connection to Router8, and a
frame-relay connection to Router2. R6 and R2 speak BGP with each other, and
R6 speaks ISIS with R8. I'm trying to get R6 to feed a default route to R8
(redistributing BGP into ISIS is a bad idea), and here's what I've discovered
so far:
1) R6 does *not* automatically set the ATT bit in its LSP updates to R8,
despite R6 being L1/L2 and R8 being L1.
2) Configuring a static route to null0 on the L1/L2 router and redistributing
static does not work. L1 routers (R8) do not receive a default route.
3) Configuring a static route to null0 on the L1/L2 router and using
"default-information originate" does not work. L1 routers do not receive a
default route.
4) Configuring ISIS between R6 and R2 *does* impel R6 to send a default route
to R8. This is the *only* configuration so far which gets a default route
into R8's routing table.
For the record, R8 is running 12.1(3r)T2, and R6 is running Version 12.2(8r).
My question is this: what is the ISIS equivalent of an ASBR? It doesn't seem
to want to feed a default route to anyone else unless it's attached to another
*ISIS* area!
Thanks,
BJW
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