Page 212 7750 SR OS Services Guide
VLL ATM SAP Procedures
The operator enables the following CE address dynamic learning procedures by enabling the ce-
address-discovery option under the VLL service.
• 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 7750 SR receives an invATM ARP request message over the ATM SAP, silently
discards it. The 7750 SR does not support receiving or sending of an invATM ARP
message.
• If the Ipipe service makes use of 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 7750 SR will not make further updates to the address list TLV to the remote PE node
using a T-LDP status notification message since the learned IP address of the ATM
attached CE will never change 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 7750 SR will not send any notification messages containing the address
list TLV during the lifetime of the IP pseudowire.
VLL PPP/IPCP and Cisco-HDLC SAP Procedures
The procedures are similar to the case of an ATM SAP. The remote CE address can only be learned
in the case of a PPP SAP but is not sent in the address list TLV to the remote PE in both PPP and
Cisco-HDLC SAP cases.
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