Hi all.
The maximum configurable MTU for a 3550 series (excl 3550-12's which
can do 2000) is 1546 bytes. Can anyone confirm if this is PAYLOAD
size, or raw frame size?
I am interested in using a number of these in a network "upgrade"
where MPLS is required.
My specific reasoning behind wanting to know is in relation to
pseudowires and the ability to transport a full 1500 byte IP packet
without having to resort to fragmentation.
A pseudowire transporting an IP packet in tagged ethernet over tagged
ethernet needs (in its most basic form):
14 (outer ethernet) + 4 (outer VLAN) + 8 (2 MPLS labels) + 4 (PW
control word) + 14 (inner ethernet) + 4 (innter VLAN) + 1500 IP packet
Thats 1548 bytes. 2 bytes over blown (sounds a lot like the budget I
have to accomplish this upgrade). :-)
But if 1546 is meerly the payload I can transport, and if ontop of
that are the outer ethernet headers (e.g. 1564 raw frame size) then
all is fine and dandy, and I get a few more bytes to play with in
customer ethernet/MPLS land.
Anyone got any comments from prior experience with these switches?
Thanks,
Tom
_______________________________________________
cisco-nsp mailing list [email protected]
https://puck.nether.net/mailman/listinfo/cisco-nsp
archive at http://puck.nether.net/pipermail/cisco-nsp/
