From: Tim (ccie2be@nyc.rr.com)
Date: Fri Dec 09 2005 - 13:14:11 GMT-3
Hi Sameer,
It is critically important that you thoroughly understand the timers for
every routing protocol covered in the lab.
You can find part of the answer to your question in the command reference
where it details each of the timer parameters.
In addition, you should check out the Jeff Doyle book, Routing TCP/IP. Of
course, if you don't have this book, you really must get it.
If you have 3 routers, I suggest you configure rip on all 3 of them and try
different combo's of values for the timers parameters and see how long
reconvergence takes under the different scenario's. Create a loopback,
advertise it out thru rip and then shutdown the interface. After you
shutdown the interface, go to the other routers and look at their route
tables. What do you see?
You may also want to enable debug ip rip to see another aspect of what's
going on. Get very comfortable with these commands and make sure you know
how to interpret the output from these debug commands. make sure everything
you see in the debug output makes sense to you. If you can't figure out why
you're seeing something, copy that output along with your config's to group
study. I'm sure you'll get a good explanation to your query.
Also, pay attention to the default settings - usually one timer is, by
default, a multiple of another timer.
As you're testing these scenario's, keep checking the route tables to see
how routes appear after they've been shutdown. Does the route disappear
from the table immediately? Does the route show up differently?
It's not enough to know just what to expect under certain conditions. If
you want to become a ccie, you'll also need to know how to verify and
investigate what's going on "under the hood".
HTH, Tim
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Khurana, Sameer
Sent: Friday, December 09, 2005 10:38 AM
To: ccielab@groupstudy.com
Subject: IE - RIP Convergence Timers
Hi Group,
In the IE Advance Technologies Lab ~ Tuning RIP Convergence Timers Lab
section, it mentions to configure the lab to regain the connectivity
within 5 seconds. While checking the solution its mentioned to use the
command timers basic 1 3 0 3.
1)Can we also use timers basic 1 4 0 4 ?
2)Also, why the holddown timer recommended is 0 which can be any other
value like 3 or 4? Is it coz till the time holdown expires it will not
accept any other routes and we don't want the router to wait for 3 to 4
seconds? Am I correct?
Can somebody clear it to me?
Thanks,
Sameer
<mailto:skhurana@amfam.com>
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