Visara CNA-8000 Planning Guide - Manual (Page 16)

Chapter 2. Support of PU 2 Platforms
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CIP/CPA and IBM 3172 Replacement Considerations
The CNA-8000 offers a near perfect replacement option for the Cisco CIP/CPA products
and for the IBM 3172. In this instance, XCA and Switched PU definitions should already
be in place and available for use by the CNA-8000. Likewise, if the LAN interfaces of
the CNA-8000 are configured to use the same hardware MAC addresses formerly used
by the CIP/CPA or 3172, remote nodes should not require any reconfiguration either.
3745 Replacement Considerations
If you are migrating from a 3745 with Token Ring attached PU2 traffic to the CNA-8000,
the migration can be made relatively transparent as well. In this case the PUs should
already be defined to VTAM using Switched Major Node definitions, and no change in
these definitions should be required. The CNA-8000 will require an XCA definition in
VTAM for each Token Ring interface to be used. To make the conversion completely
transparent it will be necessary to configure the same hardware MAC addresses for use
by the CNA-8000 that was being used by the 3745. The CNA-8000 also provides the
ability to support PU2 traffic through Ethernet connections. If a bridge is currently being
used to convert Ethernet LLC traffic to run on Token Ring (to communicate through the
3745), the CNA-8000 should be able to accept the Ethernet traffic directly, perhaps
allowing retirement of the bridge as well.
3174/1174/1374 Replacement Considerations
Migration from IBM 3174, Visara 1174, and Memorex Telex 1174 or 1374 SNA gateway
technology to the XCA technology of the CNA-8000 requires conversion of Local
Channel PU2 definitions to Switched PU2 definitions. For the most part LUs defined
under the Local Channel definitions should be able to be reused under the Switched PU2
definitions. Converting to Switched PU2 definitions has the added advantage of
providing a common definition, should it be possible for the downstream PU to connect
through a different path to gain access to the host. Note that downstream nodes such as
the Visara (formerly Memorex Telex) 1174 can be configured to support an alternate
gateway to make use of this capability.