IBM Power Systems 775 Manual page 272

Example 4-22 Correcting an inconsistent topology in the cluster DB and CNM
# lsnwtopo
ISR network topology specified by cluster configuration data is 128D
# lsnwtopo -C
ISR network topology in use by CNM: 128D
In both cases, the expected topology is 8D not 128D. To correct the topology in
the Cluster DB to 8D and then synchronize it with CNM, perform the following
steps:
# chnwm -d
# chdef -t site topology=8D
# chnwm -a
Confirm that the topology has been updated to 8D via lsnwtopo and lsnwtopo -C
# lsnwtopo
ISR network topology specified by cluster configuration data is 8D
# lsnwtopo -C
ISR network topology in use by CNM: 8D
We consider a case in which the LNMC topology on a single cage or FSP does not match the
topology of the other FSPs, and the topology that is defined in the Cluster DB and CNM. This
mismatch is determined globally via the lsnwtopo -A command as described in
Example 4-21. An incorrect LNMC topology is also identified via the
/var/opt/isnm/cnm/log/eventSummary.log as shown in Example 4-23 on page 258.
Example 4-23 Identified incorrect LNMC topology
# tail /var/opt/isnm/cnm/log/eventSummary.log
11:00:26.124209 cnm_glob.cpp:1049: DB tread is starting now
11:00:26.141743 cnm_glob.cpp:1049: CNM Routing thread starting.
11:05:26.286466 comm_task.cpp:1765: MISMATCH: Expected frame 6 cage 11 supernode
5 drawer 0 topology 4 numDlink 128, but received frame 6 cage 11 supernode 5
drawer 0 topology 64 numDlink 8 Master id valid bit 1 from LNMC
11:10:26.094019 comm_task.cpp:1765: MISMATCH: Expected frame 6 cage 11 supernode
5 drawer 0 topology 4 numDlink 128, but received frame 6 cage 11 supernode 5
drawer 0 topology 64 numDlink 8 Master id valid bit 1 from LNMC
As shown in Example 4-23, when CNM is recycled, a topology mismatch is reported and
continues to be reported every 5 minutes until the topology is corrected in LNMC on the FSP
of the identified cage.
LNMC topology: The LNMC topology on frame 6 cage 11 is confirmed by issuing the
following lsnwtopo command:
# lsnwtopo -f 6 -c 11
Frame 6 Cage 11 : Topology 128D, Supernode 5, Drawer 0
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IBM Power Systems 775 for AIX and Linux HPC Solution