Re: [nsp] FDDI packet discards

From: Stephen Sprunk (ssprunk@cisco.com)
Date: Wed May 08 2002 - 10:55:41 EDT


Thus spake "Sackman, Ron" <rsackman@lucent.com>
> 3. The MTU on the router is set to 4470
> 4. The MTU on the HP-UX servers is set to 4352
>
> The HP-UX servers are dropping roughly 5% of the total packets
> they receive. We believe this is due to the mismatch in MTU size.
>
> Has anyone encountered this problem before? Is the MTU size
> mismatch the cause of the discards?

The servers can never send packets larger than 4352, so server-to-server
packets aren't your problem. It's possible your router is forwarding
packets from elsewhere that are larger than 4352, or it's originating them
itself.

A consistent MTU is mandatory to avoid problems like this.

S



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