The ISG Debuggability feature
supports conditional debugging of simple IP subscriber sessions whereby debugs
of only specified sessions appear in the debug log. The conditions that can be
applied to the subscriber sessions include IP address, VRF (IPv4 or IPv6), and
MAC address. This module describes how to enable conditional debuggability on
Cisco Intelligent Services Gateway (ISG) subscriber sessions.
Conditional debugging is not
available for service manager, QOS policy, most of the command handler, EPD
controller, ANCP, and CCM. Also, L2TP, VPDN, PPP, and PPP-based sessions can
not be conditionally debugged.
Information About ISG Debuggability
Prior to this enhancement,
debugging could be enabled for individual modules through module-wise debugging
commands. These debugs provide the flexibility to limit the debugs to a
specified subset of modules. However, when these debugs were enabled to debug
session-related issues, the logs contained debug information for all sessions
which would sometimes be unmanageable depending on the scale. With the
conditional debugging enhancement, the debug logs are limited to only specified
To determine if session debug logs are printed for the specified module,
check the following conditions:
Debug condition is configured
for the session identifier
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The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
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Table 1 Feature Information
for ISG Debuggability
Cisco IOS XE Release 3.12S
The ISG Debuggability feature supports conditional debugging
of simple IP subscriber sessions whereby debugs of only specified sessions
appear in the debug log. The conditions that can be applied to the subscriber
sessions include IP address, VRF (IPv4 or IPv6), and MAC address..
The following commands were introduced:
subscriber per-session debug,
show subscriber log,
show subscriber per-session debug
clear subscriber log.