Method and apparatus for pseudo-wire setup and maintenance using intermediate system to intermediate system (is-is)

A first Provider Edge (PE) network device adapted to configure a pseudo-wire (PW) in a network between the first PE network device and a second PE network device in the network using Intermediate System to Intermediate System (IS-IS), the first PE network device comprising:

• a set of one or more processors and a non-transitory machine-readable storage medium, wherein the non-transitory machine-readable storage medium has a PW signaling module stored therein, which when executed by the set of one or more processors, causes the first PE network device to receive a first LSP update flooded in the network by the second PE network device via IS-IS, wherein the first LSP update includes a PW association TLV targeted to the first PE network device, wherein the PW association TLV includes a PW sub-TLV that advertises the PW, determine whether the first PE network device supports the PW and whether the first PE network device has previously advertised the PW to the second PE network device, and in response to a determination that the first PE network device supports the PW and has previously advertised the PW to the second PE network device, configure a local forwarding information base with a local PW label associated with the PW such that the first PE network device forwards traffic encapsulated with the local PW label to an Attachment Circuit (AC) associated with the PW and flood a second LSP update in the network via IS-IS, wherein the second LSP update includes an indication that the first PE network device is ready to receive traffic from the second PE network device over the PW.

A non-transitory machine-readable medium having computer code stored therein, which when executed by a set of one or more processors of a first Provider Edge (PE) network device in a network, causes the first PE network device to perform operations for configuring a pseudo-wire (PW) between the first PE network device and a second PE network device in the network using Intermediate System to Intermediate System (IS-IS), the operations comprising:

• receiving a first LSP update flooded in the network by the second PE network device via IS-IS, wherein the first LSP update includes a PW association TLV targeted to the first PE network device, wherein the PW association TLV includes a PW sub-TLV that advertises the PW;
• determining whether the first PE network device supports the PW and whether the first PE network device has previously advertised the PW to the second PE network device;
• and
• in response to determining that the first PE network device supports the PW and has previously advertised the PW to the second PE network device:
• configuring a local forwarding information base with a local PW label associated with the PW such that the first PE network device forwards traffic encapsulated with the local PW label to an Attachment Circuit (AC) associated with the PW and
• flooding a second LSP update in the network via IS-IS, wherein the second LSP update includes an indication that the first PE network device is ready to receive traffic from the second PE network device over the PW.