"An upper-bound on the time thate stale routes will be\nretained by a router after a session is restarted. If an\nEnd-of-RIB (EOR) marker is received prior to this timer\nexpiring stale-routes will be flushed upon its receipt - if\nno EOR is received, then when this timer expires stale paths\nwill be purged. This timer is referred to as the\nSelection_Deferral_Timer in RFC4724" . . . . . . .