Advanced Topics in Cisco Routing: Networking at its best by Maurizo Diaz

Author:Maurizo Diaz [Diaz, Maurizo]
Language: eng
Format: azw3, epub
Tags: System Networking Advancement
Publisher: BefittingLife.com
Published: 2018-11-22T16:00:00+00:00

Using the RIP timers

All right, so we have configured, information is flowing across the enterprise. But we are running into several issues because our bandwidth may not be as much as we like it to be, or the applications that we are using are just way too big sending information, or there is so many people, so much traffic on there. So how can we control that? Let us take a look at something called the RIP timers. I am going to open up router two, and, again, let us set up our little window here so we can see exactly what we are doing.

All right, and we are going to enable and, again, I am known for shortcuts. Config t, and where you configure this is in router configuration. It will do it under the IPv4 version of rip. So we do router, rip, enter, and I am going to type a question mark. All right, and you are going to see this command right here called timers. And there is four different timers. There is an update timer, an invalid timer, a hold down timer, and a flush timer.

And as I type them, we will see what they are used for. So you type timers and then, if you do not know what to type, question mark to the rescue, basic. And then it tells you, the first timer, and the interval between the updates. How often are you going to send these updates to your neighbour routers? By default it is 30, so if you have a problem with bandwidth, you may not want to send it as often. But we will just stick to the defaults because we have got good pipes going across so we should have no issue.

Then you type another question mark and that says the invalid timer. What does that mean? By default is 180. That means after 180 seconds if there is no updates from your neighbour, it is going to consider this route invalid. The next timer is your hold down timer. And this is, well, it is the same as the invalid, why? If a route becomes invalid, you want to hold that information within your routing table for a certain period of time.

Especially, if you have a physical issue in one of your interfaces that is coming up and down, up and down. So you can play around with your invalid and your hold down timers to hold the information longer before the route gets flushed and that is our last timer that we look at, which is 240. So if you do not receive an update from your neighbour router 240 seconds, that route to that particular network will disappear completely.

Is there any difference in IPv6 and RIPng? No, there is no difference whatsoever. And of course, after you are done, you exit, exit, and then you do a copy run start. But those are your RIP timers.

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