Specifications

Caveats for Cisco IOS Release 12.0

78-6455-12

IBM Connectivity

• CSCdr87403

When Advanced Peer-to-Peer Networking (APPN) virtual data-link control (VDLC) is configured

between Cisco 3640 routers and AS/400s, there is a problem if all the network nodes (NN) are using

High Performance Routing (HPR) and there is a data-link switching (DLSw) Lite circuit

established between the Cisco 3640 data-link switching (DLSw) peers. The High-Performance

Routing data-link switching (HPR/DLSw) circuit will time out according to the 10 minute timeout

of Lite circuits (for example, when they perform an initial program load (IPL) on the AS/400s).

Consequently, this link can never be brought back up again unless you stop/start the Advanced

Peer-to-Peer Networking/Virtual Data-Link Control (APPN/VDLC) link or clear the DLSw circuit

(the one for the CP-CP sessions using SAP.04.) so that no data traffic is possible between the

AS/400s. There is no workaround.

• CSCds17085

Under rare circumstances there may be an invalid Routing Information Field (RIF) when using

Data-Link Switching/Routing Information Field (DLSw/RIF) pass-through is used. As a

consequence the llc2 session between the Network Control Protocols or the virtual

telecommunications access methods (VTAM) do not get established.

Workaround: Use remote source-route bridging (RSRB) without local-ack.

• CSCds17994

A Cisco 7200 series router displays duplicate ring violation messages when the debug source event

command is enabled, even though there is no duplicate ring at all. There is no workaround.

• CSCds18933

When mainframe is shut down and subchannels are still active, a network outage occurs in that a

Multipath Channel transmission group (MPC TG) becomes inactive. During the reactivation of the

transmission group (TG), the following error message is produced:

%RSP-3-RESTART: interface Channel4/2, output stuck

This error message could also be experienced during the configuration of a new Cisco MPC TG.

There is no workaround.

• CSCds26826

A Route Switch Processor version 4 (RSP4) running Qualified Logical Link Control may reload

under heavy loads when an initial program load (IPL) is done on the HOST to which the IPL is

initiated through QLLC or X.25. There is no workaround.

• CSCds26887

An Advanced Peer-to-Peer Networking (APPN) router with the Fast Ethernet Inter-Switch Link

(ISL) interface sometimes uses an incorrect virtual LAN number in the ISL header of the APPN

packets. There is no workaround.

• CSCds47841

A Cisco 2600 series router running Cisco IOS Release 12.0(13.3) may reload when running

data-link switching (DLSw). This happens only in a DLSw border peer network with peers on

demand that frequently get established and shut down. There is no workaround.