Each row entry represents a session that is protected by a bypass
tunnel associated with the RSVP protocol running in a virtual
router. Entries in this table cannot be created and deleted via
SNMP SET operations. An entry in this table is created by the agent
when an RSVP session is associated with a bypass tunnel that can
protect it. The entry is destroyed when the association is
removed, which happens when either the session itself goes down
or the bypass tunnel that is protecting it goes down.