Re: exchange point media (was: Re: MAE-EAST Moving? ...)

[Alex Bligh <amb () gxn net>]

jeffhaas () merit edu said:
> his is important because at least two XP's

LINX also runs mixed media (sadly) - FDDI and more sane things (GigE
and Fast Ethernet). The switches here fragment when switching toward
Fast Ethernet. They would certainly move >1500 byte pings between
FDDI ports, but I have no FDDI ports now to test whether this works
with DF set (i.e. it doesn't fragment FDDI to FDDI), nor whether
ICMP is *ever* generated.

However, I believe best practice at LINX is, and perhaps should
be elsewhere, to set MTU on your FDDI interfaces to that supported
by ethernet. Given most exchanges started with ethernet and worked
upwards, this should have been best practice everywhere from teh
start.

-- 
Alex Bligh
VP Core Network, Concentric Network Corporation
(formerly GX Networks, Xara Networks)