Configuring ANCP

ANCP uses several global-level configuration commands to enable ANCP to function on the router.

Creating a Listening TCP Socket for ANCP

Use the l2c ip listen command to create a listening TCP socket for ANCP. ANCP monitors port 6068 for ANCP TCP connection requests.

l2c ip listen

Use to create a listening TCP socket in the current virtual router context.
Example
host1(config)#l2c ip listen
Use the no version to remove the listening TCP socket and stop any new sessions from being established. The no version does not terminate any existing GSMP sessions.
See l2c ip listen.

Accessing L2C Configuration Mode for ANCP

Use the l2c command to launch the L2C Configuration (config-l2c) mode for ANCP. In this mode, you can define session timeout values and access the L2C Neighbor Configuration mode to configure an ANCP neighbor.

l2c

Use to launch the L2C Configuration (config-l2c) mode for ANCP.
Example
host1(config)#l2c host1(config-l2c)#
Use the no version to remove all ANCP configurations.
See l2c.

Defining the ANCP Session Timeout

In L2C Configuration (config-l2c) mode, you can use the session-timeout command to specify the ANCP session timeout value. The timer range is 1–25 seconds with a default value of 25 seconds.

session-timeout

Use to define the ANCP session timeout value (in seconds).
Example
host1(config-l2c)#session-timeout 10
Use the no version to revert the session timeout to its default setting, 25 seconds.
See session-timeout.

Learning the Access Node Partition ID

In L2C Configuration (config-l2c) mode, you can use the wait-for-gsmp-syn command to enable the learning option. This learning option in the virtual router enables network access server to learn the partition ID from all the access nodes.

wait-for-gsmp-syn

Use to enable the learning option in ANCP.
Example
(config-l2c)# wait-for-gsmp-syn
Use the no version to disable the learning option in ANCP.

If the access node does not send the GSMP_SYN message after initiating the TCP session, the connection is lost because the session timer expires. To avoid this, you can use the gsmp-syn-timeout command to specify the timeout value in L2C Configuration (config-l2c) mode. The timer value cannot be more than the ANCP session timeout value with a default value of 60 seconds.

gsmp-syn-timeout

Use to define the TCP session timeout value (in seconds).
Example
(config-l2c)# gsmp-syn-timeout 10
Use the no version to revert the session timeout to its default setting, 60 seconds.