I'm
working a similar project migrating from Frame Relay to ATM, where the Frame
Relay cloud (Sprint/Bell South) is attached to Cisco 4700s on the local
campuses with Xylan or Cabletron at the core and the ATM is Marconi/FORE
9500s(also Sprint/Bell South).
What
I'm finding out about the Xylan switches is that you have to be careful how the
vlans are auto-configured. IP addresses will be automatically grouped in a vlan
you may not want it to be with. You may have to manually change the vlans. The
problem I'm working out right now are the routing tables in the ATM cloud being
totally bypassed because of vlan groupings off the Xylans. As the routing table
is bypassed, I get a ping-pong effect from the ATM router(FORE) to the
local Xylan switch.
BTW: I
came in on this project just before integration and take no responsibility
for the recommendation of FORE equipment. Although FORE is superb in the layer 2
world, I'm not impressed with layer 3 and its lack of features (like no NAT
capability).
Denis
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- Telco ATM to Frame conversion BIKEMAN
- Poyerd, Denis