From: Nigel Taylor (nigel_taylor@xxxxxxxxxxx)
Date: Thu Jan 11 2001 - 02:10:49 GMT-3
I'm making changes to the isis router types as we speak to see if it changes
anything. i looked into the possibility of this being a possible summary
route and can't say for sure. In the same route table there is a summary
for for the OSPF domain .
O 182.18.0.0/16 is a summary, 10:01:24, Null0
comapred to the isis summary route of
i su 172.16.0.0/16 [115/0] via 0.0.0.0, Null0
this could be one of those cisco things. The funny thing is this keeps
comming back even after I make changes. You also made a good point in that
the 0.0.0.0 defined by the summary route is strange as well.
As far as the 0.0.0.0 generated by the L1 router in doinf some checking in
Doyle's Routing TCP/IP pg. 656-660, he mentions that there's are two ways
for the L1 router to get the default route
1. through the use of the CLNS function which knows how to interpret the ATT
bit.
2. the use of a ststic default route to 0.0.0.0 and he command
"default-information originate" on a L2 conneted device.
Nigel.
>From: "Chuck Larrieu" <chuck@cl.cncdsl.com>
>Reply-To: "Chuck Larrieu" <chuck@cl.cncdsl.com>
>To: "Nigel Taylor" <nigel_taylor@hotmail.com>, <cisco@groupstudy.com>,
> <ccielab@groupstudy.com>
>Subject: RE: ISIS and OSPF redistribution Weirdness - Update
>Date: Wed, 10 Jan 2001 16:44:24 -0800
>
>i su 172.16.0.0/16 [115/30] via 0.0.0.0, Null0
>
>
>Nigel, the other interesting thing about this route as I see it, is the
>last
>part of the line.
>
>The source is IS-IS, the su maybe we are guessing it is short for summary,
>but we don't know, and then we get to that route via 0.0.0.0 comma null0
>Without looking at some router output, this looks a bit unusual as well.
>Want to call it one of those Cisco things?
>
>I did not see a route to 0.0.0.0 in either of your show ip route outputs.
>IS-IS level one routers, if my recollection is correct, are analogous to
>OSPF stub area. In fact, it seems to me that on one of tests, I actually
>saw
>a 0.0.0.0 route generated by a level 1 router. did you spot anything like
>this on any of your level 1's?
>
>I will certainly keep an eye out when I set up next time.
>
>
>Chuck
>
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