The value of Acct-Tunnel-Connection uniquely identify a L2TP session, and to match LAC and LNS accounting record, the value of Acct-Tunnel-Connection is determined by a method shared by LAC and LNS. This means for a specified L2TP session, Acct-Tunnel-Connection from the LAC and LNS are the same.
Current ESM stats are used in Tunnel-Link and tunnel level accounting. This applies for both standard attribute and the 7750 SR’s VSA.
Tunnel level accounting stats need to aggregate all sessions stats that belong to the tunnel. There may be sessions that traverse before tunnel is down, so the system needs to remember the statistics of every session that has been created within the tunnel.
This applies for both standard attribute and the 7750 SR’s VSA.
The value of Acct-Tunnel-Packets-Lost is the aggregation of all discarded packets on both ingress and egress.