Figure: L2TP tunnel accounting shows an L2TP tunnel RADIUS accounting configuration.
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:
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Accounting packets:
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tunnel-start/stop/reject
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tunnel-link-start/stop/reject
There are no interim updates for L2TP tunnel/session accounting.
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RADIUS accounting attributes:
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Tunnel-Assignment-Id (LAC only)
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Acct-Tunnel-Connection
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Acct-Tunnel-Packets-Lost
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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.