When L2TP tunnel accounting is enabled, except for host or sla-profile-based accounting packets and attributes, the following are additional accounting packets and attributes:
Accounting packets: tunnel-start/stop/reject; tunnel-link-start/stop/reject — There are no interim updates for L2TP tunnel/session accounting.
RADIUS accounting attributes:
Tunnel-Assignment-Id (LAC only)
Acct-Tunnel-Connection
Acct-Tunnel-Packets-Lost
These attributes were added into current account-start/stop/interim-update packets (host accounting/sla-profile accounting).
Tunnel level accounting and session level accounting can be enabled or disabled independently.
New accounting packets and related RADIUS attribute list are described in Table: L2TP tunnel accounting behavior .
Some considerations of RADIUS attributes are described in RADIUS attributes value considerations.