Subject: dvmrp question/problem

From: "Jeffrey C. Ollie" <[email-masked]>
Date: Tue, 11 Nov 1997 10:00:30 -0600

I've had our MBONE connection up and running for a few weeks without any
complaints so far.  The connection is via a IP in IP tunnel between our
BCN (running 11.02/2) and our upstream's Cisco router (software version
unknown).  I was looking at the router's logs and noticed a lot of odd
entries similar to this:

Nov 11 09:01:16 bcn-214  DVMRP: SLOT:  6 SEVERITY: WARNING  ENTITY/EVENT
CODE:  82/10    Conflicting origin/mask for route. ;      Current route:
209.51.160.0/255.255.255.0, Received route: 209.51.160.0/255.255.224.0

Is this merely evidence of routing flaps in the MBONE or is there a
problem that I need to be looking into somewhere on my side?

Jeff

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From: Bill Fenner <[email-masked]>
Date: Tue, 11 Nov 1997 09:16:03 PST

Bay's implementation of DVMRP before 12.0 cannot handle overlapping
routes.  In fact, it can get into a mode where it advertises bogus
routes back into the MBone when you have overlapping routes.  Since
overlapping routes are a fact of life in today's MBone (not because
people are hole-punching or anything else that requires overlapping
routes, simply because they're lazy about what routes get advertised),
I'd upgrade to 12.0 if possible.

  Bill

---

From: [email-masked] (Jeremy Hall)
Date: Tue, 11 Nov 1997 12:24:57 -0500 (EST)

This means your router is upset about receiving two routes with the same
network number.  It should not complain about this.

Jeffrey C. Ollie said:
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From: "Jeffrey C. Ollie" <[email-masked]>
Date: Tue, 11 Nov 1997 12:18:28 -0600

> I'd upgrade to 12.0 if possible.

Ah...  That would explain it.  I'm still waiting for my copy of v12.0 to
arrive but I'll upgrade shortly after I receive it as I believe in being
a good netizen.  Is there any possibility that this "feature" could be
causing problems with my upstream?  Once when I was viewing some
sessions a while ago I caused a network-wide slowdown for them that they
believe had something to do with MBONE traffic (but that's not 100% for
sure).

Jeff