Patent ID: 11949591
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. A method for initiating a Label Switched Path (LSP) traceroute, the method performed by a network node and comprising:
receiving, from a second network node, a first echo reply packet responsive to a first echo request packet, wherein the first echo request packet includes:
a first target Forwarding Equivalence Class (FEC) stack including an FEC associated with a Binding Segment Identifier (BSID) advertised by the second network node; and
an indication that the FEC is to be replaced by a set of FECs; and

transmitting a second echo request packet that includes:
a second target FEC stack based on the set of FECs; and
a label stack including a label corresponding to the BSID, wherein the label includes a Time To Live (TTL) value associated with the BSID, wherein the TTL value indicates a number of hops from the second network node to a further network node to be traced by the second echo request packet, along an LSP represented by the BSID; and

configuring a further TTL value in at least one label that is outer in the label stack relative to the label corresponding to the BSID, such that expiration of the further TTL value is to occur at the second network node that advertises the BSID.