...
In the example below, there has been an outage over the period of the report. A large number of H.323 stations on all gatekeepers deregistered for several hours between 04:00 AM and 11PM on the 12th and 12:00 AM on the 20th13th.
The phones were clearly not able to re-register to alternate resources. As only some stations deregistered, but all Gate Keepers were affected, the following conclusions can be reached at a glance:
- The incident was not caused by a server or application issue.
- The incident was not caused by the failure of one or more Gate Keepers (say in one Port Network).
- No Gate Keepers had their loading increase, therefore the phones could not see alternatives and connect to them.
Root Cause Analysis at a glance
...
In the next example below, all most H.323 registrations are currently against only one Gate Keeper even though there are possible alternatives - meaning a single point of failure exists.
...