RTR question

From: CCIE Sec (sec_ccie@yahoo.com)
Date: Mon Dec 10 2007 - 09:18:21 ART


int fa0/0
standby 1 track 50 decrement 10
standby 1 track 51 decrement 10

track 50 rtr 50
track 51 rtr 50 reachability

rtr 50
type echo protocol ipIcmpEcho 1.1.1.1
request-data-size 100
timeout 1000
threshold 1000
frequency 2
rtr schedule 50 life forever start-time now

Pls,can anyone tell me what is the difference between the track 50,51 with and without reachability?
and what is the parameters timeout,frequency and threshold mean?
   

       
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