Restart Counters Overview
The MobileNext Broadband Gateway configured as a P-GW includes the P-GW restart counter (IE) in all GTPv2 messages that it sends to peers. The broadband gateway also receives the S-GW restart counters in GTPv2 messages from the S-GW.
A broadband gateway configured as a P-GW increments the restart counter each time the P-GW is restarted. A broadband gateway receives the peer restart count from the recovery IE in the following GTP-C messages:
- Echo request
- Echo response
- Bearer/PDP context create
- Update messages
A broadband gateway identifies a peer restart by comparing the locally stored peer restart event with the most recent restart count that is received from a peer. If the broadband gateway detects that a peer has restarted by comparing the previously received restart count with the currently received restart count, the broadband gateway deletes all the subscriber sessions associated with the down peer.
