Virtual Leased Line Services
7210 SAS M Services Guide Page 149
Rules for processing endpoint SAP active/standby status bits:
→ Since the SAP in endpoint X is never a part of a MC-LAG/MC-APS instance, a
forwarding status of ACTIVE is always advertised.
Rules for processing and merging local and received endpoint object status Up/Down operational
status:
1. Endpoint ‘X’ is operationally UP if at least one of its objects is operationally UP. It is Down
if all its objects are operationally down.
2. If all objects in endpoint ‘X’ transition locally to Down state, and/or received a “SAP Down”
notification via remote T-LDP status bits or via SAP specific OAM signal, and/or received
status bits of “SDP-binding down”, and/or received status bits of “PW not forwarding”, the
node must send status bits of “SAP Down” over all ‘Y’ endpoint spoke SDPs.
3. Endpoint ‘Y’ is operationally UP if at least one of its objects is operationally UP. It is Down
if all its objects are operationally down.
4. If a spoke SDP in endpoint ‘Y’, including the ICB spoke SDP, transitions locally to Down
state, the node must send T-LDP “SDP-binding down” status bits on this spoke SDP.
5. If a spoke SDP in endpoint ‘Y’, received T-LDP “SAP down” status bits, and/or received T-
LDP “SDP-binding down” status bits, and/or received status bits of “PW not forwarding”,
the node saves this status and takes no further action. The saved status is used for selecting
the active transmit endpoint object as per the pseudo-code in Section 5.1.2.
6. If, all objects in endpoint ‘Y’, or a single spoke SDP that exists outside of an endpoint (and
no endpoint exists), transition locally to down state, and/or received T-LDP “SAP Down”
status bits, and/or received T-LDP “SDP-binding down” status bits, and/or received status
bits of “PW not forwarding”, and/or the received status bits of ‘PW FWD standby’, the node
must send a “SAP down” notification on the ‘X’ endpoint SAP via the SAP specific OAM
signal, if applicable.
7. If the peer PE for a given object in endpoint ‘Y’ signals ‘PW FWD standby’, the spoke SDP
must be blocked in the transmit direction and the spoke SDP is not eligible for selection by
the active transmit selection rules.
8. If the peer PE for a given object in endpoint ‘Y’ does not signal ‘PW FWD standby’, then
spoke SDP is eligible for selection.
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