4.1 & in.routed

[John Talbot 7x9202]

Anybody else seeing this?

Exerpt from ROUTED(8C) SunOS 4.1 

|"In addition to  processing  incoming  packets,  routed  also periodically
|checks the routing table entries.  If an entry has not been updated for 3
|minutes, the  entry's  metric  is set  to  infinity  and  marked  for
|deletion.  Deletions are delayed an additional 60 seconds to insure the
|invalidation is propagated throughout the internet."

Can anyone tell me why in.routed with 4.1 consistently deletes routing
table entries  well below the above mentioned timers?  The average time
we're seeing is 1 minute and 40 seconds.  Range of 50 seconds to 2 minutes
30 seconds.

Exerpt from ROUTED(8C) SunOS 4.1 

|"The  routing daemon uses a variant of the Xerox NS Routing Information
|Protocol in maintaining up to date kernel routing table entries."

If this is so, deletions should occur roughly at 4 minutes.  How "variant"
is it?