Trouble shooting guide for when VTAM has problems locating resources in a Border Node configuration. This guide assumes that the basic APPN Network connectivity within the OLU network is working and the problem is related to the border node function only.
Since this is dealing with Border Node most of this document will only go into Border node specific issues and some limited general APPN session setup failure issues. This will help when the Border Node function is being implemented or you suspect it is a border node issue that is causing the session to fail.
First thing to do is gather some information about the failure and the
general configuration. We need the following
questions answered to begin troubleshooting.
- What are the VTAM messages that are being issued? These messages
can be found in the Communications Server SNA Messages.
IST663I, IST664I, IST894I, IST895I and IST891I are important
messages and are always issued for a session setup failure if the VTAM
message start
start options are defaulted or set appropriately as
described in the next paragraph.
- What are the messages in the OLU host?
- What are the messages in the ICN host if applicable?
(ICN is an Interchange node where a session request enters
APPN from a
subarea network or leaves APPN into
a Subarea Network).
- What are the messages in the DLU host? (There may not be any
messages in this host as the request may not
have reached this host.)
- Does the IST664I message indicate REAL or ALIAS DLU? Note the
NETID if
it is a REAL DLU name.
These messages are always issued and will be in the system console or
Netview log when
a session
setup failure
occurs and you are in the OLU host.
If you do not see
these messages
then check and make sure that VTAM start options SIRFMSG, FSIRFMSG and
ESIRFMSG are
coded to at least OLUSSCP or ALLSSCP. You can change these
values dynamically with the
F NET,VTAMOPTS
command in the SNA Operation manual. If the OLU
host is in Subarea then also check for these
messages at the ICN
(Interchange Node) where the Subarea search enters or leaves the APPN
Network.
SIRFMSG, FSIRFMSG and ESIRFMSG will have to be set
to ALLSSCP in this host
to see these messages.
Currently these messages will only be issued on the
OLU or DLU host in
a subarea or appn network, or on an ICN
(Interchange Node) These
messages are not issued in an intermediate VTAM in the
APPN Network.
If the message start options are set correctly then
verify if Netview is
suppressing the messages.
- Is this OLU host a Network Node (NN) or an End Node (EN)?
D NET,VTAMOPTS,OPT=NODETYPE
- Is this host a Border Node?
D NET,VTAMOPTS,OPT=BN
- If this is a Border node what is BNDYN coded to in the VTAM start
options?
D NET,VTAMOPTS,OPT=BNDYN
BNDYN can be coded on the ADJCLUST table which
will over ride the start option.
D NET,ADJCLUST command will
show the associated value for that table. If the DLU has a REAL name in
the ist664I
message you will have to include the parameter
NETID on
the D NET,ADJCLUST command to if a NETID Specific
ADJCLUST table is
coded. If no table is found then use the command without
NETID specified to see the default table.
- What is SORDER coded to?
D NET,VTAMOPTS,OPT=SORDER
If SORDER=ISTADJSSCP then you must code ISTAPNCP in the default or
NETID Specific ADJSSCP table for
this NETID to
search APPN. Any other SORDER option will search APPN by default.
SORDER can be coded on
the ADJSSCP table which will over ride the start option. D
NET,ADJSSCPS can be
issued for either
a Network Specific table or the default table.
With this information we can now continue on with trouble shooting.
Start
Trouble shooting.