[nsp] RES: [nsp] BGP maximum datagram size

From: Loureiro, Rodrigo - (Bra) (rodrigo.loureiro@attla.com)
Date: Tue Oct 30 2001 - 15:55:27 EST


Hi Stephen,

Thanks for response.

>> Does anyone know what is the maximum datagram a Cisco MP-iBGP peer
>> can send to a neighbor ?

>The MTU, of course.

This is not so obvious. If fragmentation of IP packets was working well in
the PE router code, following IP protocol premises, i wouldnīt be worried
about BGP maximum segment size.

>Okay, TCP has for some reason negotiated a MSS of 536, which means a
maximum
>datagram size of 576, assuming you're using IPv4 and there are no IP or TCP
>options present.

OK, thatīs the point. Is it dynamicaly calculated, following something like
TCP MSS calculation ? Or is it statically programmed in the code in such a
way that this value will be uniform ?

Regards,

--

Rodrigo



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