LSN logging is extremely important to the Service Providers (SP) who are required by the government agencies to track source of suspicious Internet activities back to the users that are hidden behind the LSN device.
The 7750 SR supports several modes of logging for LSN applications. Choosing the right logging model depends on the required scale, simplicity of deployment and granularity of the logged data.
For most purposes logging of allocation/de-allocation of outside port-blocks and outside IP address along with the corresponding LSN subscriber and inside service-id is sufficient.
In some cases, port-block based logging is not satisfactory and per flow logging is required.