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IPSV-CTL (Ipserver Interface Control)
Issue 1 June 2005 1413
IPSI Interchange (Duplicated IPSIs)
Software will take action upon any fault that affects the IPSI and attempt to interchange to the
healthier IPSI. In addition, when neither IPSI is completely healthy to provide clock, packet
interface and archangel, one IPSI will be chosen to be the clock, and the archangel will move to
the EI. Moving the archangel’s functionality to the EI requires another port network to have a
healthy IPSI, and this port network to have an EI. The exact order of action taken will vary
depending on the fault being processed, as well as the existing state of health (SOH) of the
IPSIs in the PN. An IPSI interchange (if necessary) will always happen before a control change
(moving of the archangel to/from IPSI/EI). If both IPSIs are equally healthy, software
preferentially migrates to the A-side IPSI. However, this preferential migration is not done if craft
has set to a B-side IPSI.
Craft can also demand an interchange of IPSIs in one or every PN from the SAT. The command
set ipserver-interface Uc is used to interchange a specific IPSI. In addition, set
ipserver-interface a-all | b-all can be used to interchange every IPSI in the
system to the A-side or B-side respectively. This is particularly useful if preparing for a
control-network outage. For a planned interchange of IPSIs, the following steps occur. The:
1. Going active IPSI is marked as active, the going standby is marked as standby.
2. Tone-Clock is migrated. This includes tone generation as well as TDM clock.
3. Archangel is migrated to the newly active IPSI.
4. PKT-INT on the newly active IPSI is made active. Every link is migrated between IPSIs.
See Table 507: Error codes for set ipserver-interface
on page 1413 for ABORT/FAIL codes
associated with set ipserver-interface:
Table 507: Error codes for set ipserver-interface
Error
Code
Command
Result
Description
2343 ABRT Interchange not permitted. The anti-thrashing timer has not yet
expired.
1. Retry command in 30 seconds.
2338 FAIL The SOH of the set-to IPSI is bad. Use list ipserver-interface
to display the current IPSI’s SOH.
2341 FAIL An error occurred during the interchange.
2342 FAIL The set-to IPSI has been busied out.
1. Run release ipserver-interface Uc.
PASS The interchange was successful, or the set to IPSI was already active.
If set to a B-side IPSI, it will be marked as “craft set” and will not
preference switch back to the A-side by software.