The operator enables the following CE address dynamic learning procedures by enabling the ce-address-discovery option under the VLL service on the 7750 SR.
Allow the service to come up without the ce-address parameter configured at both the SAP and spoke-SDP. If one or both parameters are configured, they are ignored.
The operator is not allowed to configure the ce-address parameter under the SAP or spoke-SDP when the ce-address-discovery option under the VLL service is enabled. Conversely, the operator is not allowed to enable the ce-address-discovery option under the Ipipe service if it has a SAP and, or spoke-SDP with a user-entered ce-address parameter.
If the router receives an invATM ARP request message over the ATM SAP, the router silently discards it. The router does not support receiving or sending of an invATM ARP message.
If the Ipipe service uses a spoke-SDP, the router includes the address list TLV in the interface parameters field of the pseudowire FEC TLV in the label mapping message. The address list TLV contains an address value of 0.0.0.0.
If the remote PE included the address list TLV in the received label mapping message, the local router does not make further updates to the address list TLV to the remote PE node using a T-LDP status notification message because the learned IP address of the ATM-attached CE never changes away from the value of 0.0.0.0.
If the remote PE did not include the address list TLV in the received label mapping message, the local router does not send any notification messages containing the address list TLV during the lifetime of the IP pseudowire.