Internetworking framework for multi-protocol label switching-transport profile and operation administration and maintenance protocols
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorsDavid Ian Allan, David Saccon, David Sinicrope
Life of this patent
Estimating the term…
Abstract
Systems, methods, and apparatuses for BFD to Y.1731 internetworking are described. In one embodiment, a method of processing defect conditions in a maintenance endpoint (MEP) of a first domain, the MEP a component of a bidirectional forwarding detection (BFD) to Y.1731 interworking interface (IWF) in a multi-protocol label switching (MPLS) network is described.
Claims7
A method of processing defect conditions in a maintenance endpoint (MEP) of a first domain, the MEP a component of a bidirectional forwarding detection (BFD) to Y.1731 interworking interface (IWF) in a multi-protocol label switching (MPLS) network, the method comprising:
- receiving a peer alarm indication signal (AIS) at an IWF MEP of a BFD domain of the MPLS network from an IWF MEP in a second domain of the MPLS network, wherein the IWF MEP of the BFD domain operates according to a state machine;
- in response to receiving the peer AIS from the IWF MEP of the second domain of the MPLS network, the IWF MEP of the BFD domain of the MPLS network
- transitioning the state machine to a down/off state;
- halting BFD protocol data unit generation,
- periodically providing an AIS indication in a format appropriate for the BFD domain to a remote MEP in the BFD domain of the MPLS network;
- and
- ignoring other messages received at the IWF MEP of the BFD domain until it is no longer receiving a peer AIS from the IWF MEP of the second domain;
- and wherein other states of the state machine include,
- an init state wherein a remote MEP in the BFD domain is communicating with the BFD IWF MEP but a session has not yet been established between the remote MEP in the BFD domain and the BFD IWF MEP;
- an up state wherein a BFD session has successfully been established between the remote MEP in the BFD domain and the BFD IWF MEP;
- a down state wherein a BFD session between the remote MEP in the BFD domain and the BFD IWF MEP is down and a forwarding path from the BFD IWF MEP is unavailable.
A system for processing defect conditions in a maintenance endpoint (MEP) of a first domain, the MEP a component of a bidirectional forwarding detection (BFD) to Y.1731 interworking interface (IWF) in a multi-protocol label switching (MPLS) network, the system comprising:
- a BFD IWF MEP in a BFD domain for receiving and transmitting messages and indications from a Y.1731 IWF MEP in a Y.1731 domain, wherein the BFD IWF MEP is to operate according to a state machine, wherein in
- an init state a remote MEP in the BFD domain is communicating with the BFD IWF MEP but a session has not yet been established between the remote MEP in the BFD domain and the BFD IWF MEP,
- an up state a BFD session has successfully been established between the remote MEP in the BFD domain and the BFD IWF MEP,
- a down state wherein a BFD session between the remote MEP in the BFD domain and the BFD IWF MEP is down and a forwarding path from the BFD IWF MEP is unavailable, and
- a down/off state the BFD IWF MEP halts BFD protocol data unit generation, periodically provides an alarm indication signal (AIS) in a format appropriate for the BFD domain to the remote MEP in the BFD domain of the MPLS network, and ignores other messages received at the BFD IWF MEP until it is no longer receiving a peer AIS from the Y.1731 IWF MEP;
- and
- the Y.1731 IWF MEP, the Y.1731 IWF MEP to operate according to a state machine, wherein in
- an up state the Y.1731 IWF MEP generates continuity check messages, and
- a down state halts the generation of continuity check messages and generates AIS in a format appropriate for the Y.1731 domain.
Dependencies are inferred from the claim text.