13-2
Cisco SCE 8000 10GBE Software Configuration Guide
OL-30621-02
Chapter 13 Managing the SCMP
About SCMP
About SCMP
The Service Control Management Protocol (SCMP) is a protocol that integrates the Cisco SCE platform
and the ISG (Intelligent Service Gateway) functionality of the Cisco routers, thereby providing a
mechanism that allows the ISG and the Cisco SCE platform to manage subscriber sessions together
without requiring coordination and orchestration by additional components.
•
•
Deployment Scenarios, page 13-3
•
•
SCMP Subscriber Management, page 13-8
The SCMP is a Cisco proprietary protocol that uses the RADIUS protocol with CoA (Change of
Authorization) support as a transport layer. The SCMP provides connection management messages,
subscriber management and subscriber accounting messages. Each subscriber in the Cisco SCE platform
represents a session in the SCMP peer (as defined by the ISG terminology).
Connection management
The Cisco SCE platform initiates the connection to the peer device. On SCMP connection establishment,
the Cisco SCE platform and ISG negotiate the following details:
•
Introduction mode – whether the SCMP peer must send a session-provisioning message on session
creation.
•
Keep-alive message interval
•
Protocol version
Subscriber Management
The SCMP peers can work in either of two introduction modes. These introduction modes affect only
how and when a session is created on the Cisco SCE platform:
•
The SCMP peer provisions the session to the Cisco SCE platform when it is created in the peer
device (push)
•
The Cisco SCE platform queries the SCMP peer regarding unmapped IP traffic (pull).
The SCMP uses queries as a backup to the push introduction mode, to be robust to issues such as
networking problems and Cisco SCE platform reboot.
In addition to session creation, the SCMP supports the following operations:
•
Change of session policy and network IDs using the update-session message
•
Removal of the session when the user logs-out
•
Activate-policy, which changes the session policy
•
Deactivate-policy, which sets the policy value of the related anonymous-group template (based on
the session manager)
Subscriber Accounting
On session creation, the Cisco SCE platform sends an accounting start message for the session and on
logout, it sends an accounting stop message for the session. In addition, for each SCA BB
service-counter an accounting-session is maintained (start, interim and stop messages), which provides
information regarding the relevant volume, flow-count and duration.
The accounting messages are based on the new Subscriber-Accounting RDR and are sent according to
the interval defined in the PQB configuration.
