Rip update timer fire

RIP is one of those. Most CCIE candidates understand that we can change the interface or global parameters for updates, unicast, multicast, etc. What does take some time, is figuring out the global timers, especially if a person is not sure how they interact.

In this post, we will address the RIP process level timers for update, invalid, hold down and flush. I don't want you to sleep during this, so we will save that one for later. Timers Basic, all in seconds: Update : how often to send updates in seconds Invalid : how many seconds, since seeing a valid update, to consider the route invalid, and placing the route into hold down Hold Down : Once in hold down, how long in seconds to "not believe" any equal or less impressive worse route updates for routes that are in hold down Flush : how many seconds, since the last valid update, until we throw that route in the trash garbage collection for un-loved non-updated routes.

Here is our topology. Keep your attention on R2, and that will be the focal point for this lesson. We can see that R2 is learning 2 routes from R3, the Here is an update from R3. Notice the time stamp of For example, if router A receives an update from router B containing a route with a metric of 2, router A will add the route to its routing table, list router B as the next hop for that network route, and record a metric of 3 to account for the hop between router A and router B.

If router B advertises network s that router A already has a route for, router A will simply discard the advertisement, unless router B has a lower metric to the destination network. A directly connected network has a hop count of 0, just as a network connected to a directly connected router has a hop count of 1. A hop count of 16 is considered unreachable. Router C advertises its network, Router B adds Router B then advertises its own routing table to router A and router C.

Router A learns from router B about networks Router A adds network The next hop address for both of these networks is Router A now knows that it can send packets destined for network B or network C to router B for delivery. Editor's Picks. This lab will discuss and demonstrate the configuration and verification of RIP Timers.

If you take a look back to lab Configuring Routing Information Protocol RIP it discusses the different types of timers and what they do. The timers are configured in rip router configuration mode as a global setting however the update timer can be configured on a per interface basis.

Each is represented as a value in seconds. Communities: Chinese Japanese Korean. All Rights Reserved. The Cisco Learning Network. View This Post. Edited by Admin February 16, at AM. RIP timers. Hello everyone, RIP has four timers update, invalid, hold down and flush timer, update timer - after that broadcast sent 30sec invalid timer - after expire route declare as a invalid sec hold down - what does happen after hold down timer expire sec Flush timer - after expire route entry deleted form routing table sec after disable one of my neighbor route and then observed routing table in first case it's showing normal and after that it's showing possible down and then flush from routing table so which timer declared route as possibly down?

Alpesh wrote: so which timer declared route as possibly down?