Example operation of G.8031 BGP-MH

Any Ethernet tunnel actions (force, lock) on the CE (single site) do not control the action to switch paths directly, but they may influence the outcome of BGP-MH if they are on a control tunnel. If a path is disabled on the CE, the result may force the SAP with an MEP on the PE to eventually take the SAP down; Nokia recommends running commands from the BGP-MH side to control these connections.

Figure 1. Full redundancy G.8031 Epipe and BGP-MH

Table 1 lists the SAP MEP signaling shown in Figure 1. For a description of the events shown in this example operation, see Events in example operation.

Table 1. SAP MEP signaling
	G.8031 ET on CE	Path A MEP facing node B local ifStatus	Path B MEP facing node C local ifStatus	Path B PE MEP ifStatus	Path B PE MEP ifStatus
1	Down (inactive)	No Fault^¹	No Fault	Fault	Fault
2	Up use Path A	No Fault	No Fault	No Fault	Fault
3	Up use Path B	No Fault	No Fault	Fault	No Fault
4	Down Path A fault	Fault^²	No Fault	Fault	Fault
5	Down Path A and B fault at A	Fault	No Fault	Fault	Fault
6	Partitioned Network Use Path Precedence Up use Path A	No Fault	No Fault	No Fault	No Fault