System information

70 IBM and Cisco LAN Switching: Interoperability and Migration Guide
Figure 45. Overlay Ethernet backbone for migration
There are several challenges in this migration phase. As we intuitively feel
from looking at Figure 45, most of the challenges stem from the server
connections.
To make the entire process manageable, It would probably be a good idea to
start by moving all or most of the servers to the Ethernet backbone. We need
to do so because there is often no or only a little proximity between user
workstations and servers. In other words, the group of users that use a
particular set of servers have usually been scattered over all the workstation
segments as time has passed.
Moving the servers from the ATM backbone to the Ethernet backbone also
presents an occasion for some degree of server consolidation, if this should
be desirable at the time.
If we stage the migration so that we first migrate all the servers, and
subsequently the workstations are migrated to Ethernet, for instance as they
are upgraded to newer versions that have on-board Ethernet adapters, clearly
IBM 8265
Cisco
Switch
OC-12
8270
8270
8270
8271
2900
2900
Migration
MPEG,H.320
CES,CAS
Video
Telephony
Special
WAN