Maintenance
162 Avaya Enterprise Survivable Servers (ESS) Users Guide
See Data Networking on page 70 for more information about when to use cnc.
ESS Maintenance Procedures
Lock a Center Stage Switch (CSS) to one Port Network
Connectivity (PNC)
When an ESS server acquires a Port Network but other duplicated CSS connected Port
Networks are still controlled by the Main server it may appear, to the Main server, that a multiple
fault condition exists in the CSS. This is because the duplicated Expansion Interface (EI)
boards, that are still controlled by the Main server, detect an unexpected failure on both sides of
the PNC. On duplicated CSS PNC configurations, depending on the exact order and timing with
which the faults are reported, the CSS fault recovery processes in the Main server may tear
down calls on other PNs. ESS server processes try to mitigate this action but it is impossible to
eliminate it entirely.
It may be necessary, to avoid thrashing in a duplex CSS configuration, to lock the PNC while
acquiring Port Networks (PNs). Thrashing may occur because, when a Port Network is acquired
by a media server, a level 2 Port Network restart is initiated. This causes every board in the Port
Network to be reset. This would appear to the CSS switch as both Expansion Interface circuit
packs being reset simultaneously and might cause the CSS to try and switch to the off-line
PNC. The steps to lock the CSS while acquiring PNs are:
1. Submit set pnc lock on the SAT of the Main server.
2. Submit get forced-takeover ipserver-interface port-network N for the Port
Network(s) desired on the acquiring server SAT.
3. Wait for the acquiring server to reset the acquired Port Network(s).
4. Submit set pnc unlock on the SAT of the Main server.
cnc command options
command option description
cnc on Enables Control Network C on the S8700 | 8710 series media servers.
off Disables Control Network C on
S8700 | 8710 series media servers.
status Determine whether Control Network C on
S8700 | 8710 series media
server is enabled or disabled.
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