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LSPs Qualified in IGP Shortcut Computations

 

Not all LSPs are used in IGP shortcuts. Only those LSPs whose egress point (using the to statement) matches the router ID of the egress node are considered. Other LSPs, whose egress point matches the egress node interface address, are ignored in IGP shortcuts.

There are exceptions, however. If an LSP has an alias egress point (using the install statement) and it matches certain router IDs, it is included in the shortcut computation as well. If multiple equal metric LSPs destined to the same router ID exist, traffic can load-share among them.