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[inet-admins] RE: incompatibility between CISCO & Bay Network (fwd)

 , IMHO.

----- Forwarded message from Andersen, Jens -----

From: "Andersen, Jens" <ANDERSEN@btfrance.agw.bt.co.uk>
Subject: RE: incompatibility between CISCO & Bay Network
Date: Thu, 22 May 1997 10:57:00 +0100


I had a similar problem between a Cisco and a wellfleet. though it was
the other way round
They refused to establish OSPF neighborship.
It showed up that the wellfleet sent OSPF database descriptor frames
with a size  of 1576 (with a MTU setting of 1500)
The Cisco dropped those dead as they were above the accepted MTU
Raising the MTU on my Cisco to 1576 solved the problem.

However, it raises some questions on the exact size of the MTU

What size will the Cisco send/accept with a MTU setting of 1500 ? my
guess is 1500

What size will the wellfleet send/accept with the same MTU setting ? it
is NOT 1500  !!

Best regards

Jens Andersen /BT France
From: Jason Chu
Subject: incompatibility between CISCO & Bay Network
Date: Thursday 22 May 1997 01:56

My customer uses a Bay Network router (BLN2, OS: Site Manager 11.0) to
connect to my CISCO 7513 (IOS 11.1(8)) and then to the internet thru my
CISCO.  He said people on the internet can see his homepage but users on
LAN can not browse most homepages outside while other services like FTP
telnet worked OK.  He tried everything and finally found that the
came from the MTU settings on interfaces of both router.  My MTU setting
1500.  If he also uses MTU 1500, problem happens.  If he raise his MTU
setting to, e.g, 1524 or above,  everything went smoothly.  As I know,
is negotiated when ppp connection built-up, there seems no reason that
traffice be restricted in on way.
Can you give me some help ?

Thank you and best regards.

Jason Chu

----- End of forwarded message from Andersen, Jens -----
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