Bridging TR and ET over ISDN

[fritzle]

Hello all,
perhaps anyone has got a useful tip for me.
I want to bridge the TR and ET traffic over ISDN (2xBRI)
to another location (IP + SNA/DLSW).
Existing routers are a 3640 and a 261x;
Backround is that one machine in a remote loaction (disaster recovery location) should be reachable with the same ip and mac address (for SNA) as the original over thwe WAN.
So the demand is to relonger the ip subnet over ISDN using bridging functionality (remote TR/ET bridge);
Has got anyone a tip for an example configuration ?
Or better: has anyone a hint to avoid bridging and using
routing instaed ?

Any tips are welcome.
Thanks for help in advance.

Best regards,
Fritz

 

[juggy]

Im lost a little but I think I get it you want a remote site to join your network I would have thought you would have just had to set up the ISDN and the token ring to be in the same ring group and bridge group and the same on the other side. DLSW would be used if you were doing it properly ie DLSW would bridge/route SNA and then you would route off the rest as a remote site. I would recommend this approach and then leave you to think of an IP strategy ie use a hostname instead of the actual IP address and then if you ever switch over to DR then all you to is update the naming resolution IP address which would have to be statically defined ie in WINS therefore in the event of a problem you fire up the DR box let DLSW establish a link and then change wins to reflect the IP change (or DNS) Bridging well its alot more hap hazard then the routing approach

DLSW help can be found here

http://www.cisco.com/univercd/cc/td/doc/cisintwk/idg4/nd2007.htm

 

[fritzle]

Hello Juggy,
thanks for your useful comments.
I've thought about the DNS/WINS change- that would be thee easiest setup.Problem is that the machine at the remote DRA site is client accessed mostly directly with the ip address and not with a name. Thats why i must use an ip address out of the local subnet at the remote DRA site, thats the reason why my first intention was to bridge.
SNA/DLSW should be no problem, because TR based.
At the moment the setup is realized with very old IBM PC TR remote bridges and ISDN-TA at local and remote site.
The task is to replace this old equipment with Cisco routers and add also Ethernet connectivity (old solution only supports TR) on remote and local site for DRA situation.
Of course the briding issue is a challenge as well as a hazard, but i've got no other workaround.
Do you have any other idea to achieve it without bridging ?

Best regards,
Fritz