From: Ron (id353@singnet.com.sg)
Date: Wed Nov 20 2002 - 02:43:06 GMT-3
Group,
Got this from Cisco:
timers basic
To adjust RIP network timers, use the timers basic router configuration command. To restore the default timers, use the no form of this command.
timers basic update invalid holddown flush
update
Rate in seconds at which updates are sent. This is the fundamental timing parameter of the routing protocol. The default is 30 seconds.
invalid
Interval of time (in seconds) after which a route is declared invalid. The interval should be at least three times the value of update time. The interval is measured from the last update received for the route. The route becomes invalid when there is an absence of updates during the invalid time that refresh the route. The route is marked inaccessible and advertised as unreachable. However, the route still forwards packets until the flush interval expires. The default is 180 seconds.
holddown
Interval (in seconds) during which routing information regarding better paths is suppressed. The interval should be at least three times the value of update time. A route enters into a holddown state when an update packet is received that indicates the route is unreachable. The route is marked inaccessible and advertised as unreachable. However, the route continues to forward packets until an update is received with a better metric or until the holddown time expires. When the holddown expires, routes advertised by other sources are accepted and the route is no longer inaccessible. The default is 180 seconds.
flush
Amount of time (in seconds) that must pass before the route is removed from the routing table. The interval is measured from the last update received for the route. The interval should be longer than the larger of the invalid and holddown values. If the interval is less than the sum of the update and holddown values, the proper holddown interval cannot elapse, which results in a new route being accepted before the holddown interval expires. The default is 240 seconds.
If I need to set RIP update timers to 45, what will be the eventual values for all ? I came up with
timers basic 45 135 135 360
I'm confused with the flush values, the top infomation mentions that flush should be the SUM of both update and holdown values but on Routing TCP/IP, Volume I (CCIE Professional Development) By Jeff Doyle, it was mentioned that the values for flush should be 60 seconds longer than the expiration (invalid)time.
According to Jeff Doyle, it will be "timers basic 45 135 135 195"
Which is correct here ?
TIA.
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