From: Snow, Tim (timothy.snow@eds.com)
Date: Tue Jul 01 2003 - 06:53:04 GMT-3
In my experience, the NBMA issue with ISIS isn't solvable by "normal"
measures.
From what I've seen....
The DIS will advertise connectivity to the other two routers in a "ospf type
3 summary" type of message. When the other routers hear this, they assume
based on the fact that the DIS advertises their information that they can
get to the other router which is confirmed if you take a look at the ISIS
database. The route your looking for will be in there but it appears to
fail some sanity type of check. This differs from a ISIS point-to-point
link as both routers advertise their neighbors in that update so as to help
the other routers in the network to build their SPF trees.
Also, I don't believe ISIS has any "split-horizon" issues as that is a
distance vector mechanism.
As far as a workaround, you could build a tunnel and get around it, not
easy but doable. Good luck.
Tim
-----Original Message-----
From: Sage Vadi [mailto:sagevadi@yahoo.co.uk]
Sent: Tuesday, July 01, 2003 5:31 AM
To: ccielab@groupstudy.com
Subject: ISIS: Level-2 routes
Hi all,
R1---R2---R3
This is ISIS NBMA(frame-relay) network. All the
interfaces are point-to-multipoint (as per IIH's).
Problem I am seeing:
R2 learns routes from R3 and R1, but it doesn't send
them to each other. These are all Level-2-Only
routers, and are within the same area, split-horizon
is disabled under their subinterfaces.
Q) Has anybody seen this before? And how do I get
around this, what am I doing wrong?
Thanks in advance,
rgds,
Sage
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