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IBM Protocols and Services Notes 47
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IBM Protocols and
Services Notes
This section describes notes, cautions, and other considerations to be aware of
when using the Enterprise OS software when with IBM protocols and services. The
topics are presented in alphabetical order.
APPN In software version 11.4, APPN does not support SMDS.
APPN Connections to
3174 through
Token Ring
When you connect to a 3174 on a token ring, you may need to enable transparent
bridging on the bridge/router. The 3174 may send exchange identification (XID) as
a non-source routed frame.
APPN CP-CP Sessions
and SNA Boundary
Routing
If you set up APPN routing in an SNA Boundary Routing configuration from a
NETBuilder II bridge/router to a leaf node bridge/router, CP-CP sessions between
the remote site PC and the NETBuilder II bridge/router are established before you
can configure the Boundary Routing configuration on the NETBuilder II
bridge/router. However, after you set the -BCN CONTrol parameter for IBM traffic
and enable the -BCN Service, the NETBuilder II bridge/router no longer receives the
CP-CP sessions. To work around this problem, first turn off BOOTP on the
NETBuilder II port at the central site. An alternative work around is to configure
APPN with DLSw at the central site and to use the CEC’s MAC address at the
remote site.
APPN CP-CP Sessions on
Parallel TGs
When parallel transmission groups (TGs) are configured between 3Com network
nodes and both TGs support CP-CP sessions, a CP-CP session on one TG does not
switch to the other TG if the user disables the port or path. This happens because
both sides learn about the link failure at different times. The network node with
the disabled port or path learns about the link failure right away and tries to bring
CP-CP sessions up on the second TG. However, the second network node does
not learn about the link failure until LLC2 times out; because it thinks the link is
still up, the second network node does not allow CP-CP sessions to start on the
second TG. After five attempts at bringing up CP-CP sessions on the second TG,
the second TG will be flagged as not supporting CP-CP sessions, preventing CP-CP
sessions from coming up on that second TG. To prevent this situation, manually
stop the first TG by entering the SET -APPN LinkStaCONTrol <LinkName>
Deactivate command before disabling the port/path. By doing this, both network
nodes will learn that the link has gone down at the same time, and CP-CP session
can be activated on the second TG.
APPN DLUr Connections
to 3174 Systems
When you configure an APPN dependent LU requestor (DLUr) connection from a
NETBuilder II bridge/router to a 3174 cluster controller, the NETBuilder II network
node and the 3174 must be on the same ring. In this configuration, the
NETBuilder II token ring port must be set to transparent bridging only.
BSC and Leased Lines The BSC pass-through feature is limited to leased lines and cannot use dialup links.