Hi! 
I would like to know the exact  meaning of the following lines when I issue the command 
"sh ip bgp neigh x.y.a.b"
------------Last read 00:00:03, hold time is 180, keepalive interval is 60 second---------------
what is the meaning of the line last read.. I saw  that this time keeps incrementing and suddenly falls back to 00:00:00 and again starts increasing..
Also what is the meaning of hold time..
Thanx
in advance/
Iyer rs
BGP version 4, remote router ID 201.139.171.189
BGP state = Established, table version = 58358, up for 4d06h
  Last read 00:00:03, hold time is 180, keepalive interval is 60 seconds
  Minimum time between advertisement runs is 30 Rcvd: 61562 (out of order: 0), with data: 55880, total data bytes: 37136191
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