RE: Telco ATM to Frame conversion

[Poyerd, Denis]

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 -----Original Message----- From: BIKEMAN [mailto:[EMAIL PROTECTED]] Sent: Friday, August 11, 2000 5:34 AM To: [EMAIL PROTECTED] Subject: Telco ATM to Frame conversion Hi all   I'm currently desgning a network with 200 sites connecting via frame relay to the three core sites with the core being a fully meshed ATM switched network (Xylan layer 2 and 3 ATM switches).   What I'm wondering about and haven't had much luck finding out from the telco's is whether inverse arp will still be working ? My opinion is that the inverse arp might have some problems - with the layer 3 switches I think things might get a little complicated (I am disabling inverse arp on the routers)   I realise this depends mostly on what the telco is doing to convert the frame to ATM, but any info or anecdotes you might have about similar things would be welcome.   Regards   Rudi Meyer