Date: Thu, 6 Jul 2000 08:40:15 +0200 (CEST) From: Luigi Rizzo <luigi@info.iet.unipi.it> To: tim@iafrica.com.na Cc: David Gilbert <dgilbert@velocet.ca>, Kevin Oberman <oberman@es.net>, "Louis A. Mamakos" <louie@TransSys.COM>, Joerg Micheel <joerg@cs.waikato.ac.nz>, freebsd-stable@FreeBSD.ORG Subject: Re: Ethernet MTUs > 1500? Message-ID: <200007060640.IAA82096@info.iet.unipi.it> In-Reply-To: <396368C9.C3C5A50F@polytechnic.edu.na> from Tim Priebe at "Jul 5, 2000 05:56:41 pm"
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> > just curious, what do we do when we have multiple encapsulation ? > > (i.e. is this allowed ?) ... > I am not sure what you mean. If you mean "VLAN encapsulation", then it > is a misunderstanding. The standard Ethernet frame is not encapsulated. ok think of the following: I have a st machine which goes through a VLAN bridge out to a trunk interface, which in turn goes into a VLAN bridge which does trunkinking again ... basically you might end up with frames being encapsulated multiple times (and decapsulated on the reverse path). Now i wonder if this is allowed by the vlan spec and also how does a vlan bridge behaves when it sees a vlan-tagged frame on a non-trunk port. I do know how my FreeBSD-based vlan bridge behaves -- it does multiple encaps, but then if a packet becomes too large it is silently dropped by the interface. cheers luigi -----------------------------------+------------------------------------- Luigi RIZZO, luigi@iet.unipi.it . Dip. di Ing. dell'Informazione http://www.iet.unipi.it/~luigi/ . Universita` di Pisa TEL/FAX: +39-050-568.533/522 . via Diotisalvi 2, 56126 PISA (Italy) Mobile +39-347-0373137 -----------------------------------+------------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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