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Steven King
 Post subject: EIGRP Issues...
PostPosted: Sat Sep 03, 2011 9:49 pm 
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Hi all. I'm labbing with GNS3 and I don't know if it's the image I have or GNS3 but I'm getting shakyness after establishing a basic EIGRP setup between three routers:

Code:
*Mar  1 00:04:55.098: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 10.1.203.2 (Serial0/1) is down: holding time expired
R3#
*Mar  1 00:04:56.549: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 10.1.203.2 (Serial0/1) is up: new adjacency
R3#
*Mar  1 00:05:18.152: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 10.1.103.1 (Serial0/0) is down: Interface Goodbye received


Anyone experience anything like this?

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Vito_Corleone
 Post subject: Re: EIGRP Issues...
PostPosted: Sat Sep 03, 2011 9:59 pm 
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Post eigrp and interface config. If it's just a basic setup, you should try some different code and/or routers in mips.

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wirerat
 Post subject: Re: EIGRP Issues...
PostPosted: Sun Sep 04, 2011 6:10 am 
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Is your workstation's CPU usage pretty high?

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Steven King
 Post subject: Re: EIGRP Issues...
PostPosted: Sun Sep 04, 2011 7:43 am 
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Quote:
Is your workstation's CPU usage pretty high?

It usually is at 100% for about 5 minutes after starting the routers but then drops to about 50%. I've done the idle pc and idle max changes suggested in the optimization thread. My workstation is a laptop with a Core 2 Duo at 1.66 and 2 GB of RAM.

Quote:
Post eigrp and interface config. If it's just a basic setup, you should try some different code and/or routers in mips.

Code:
R1#sh run | begin eigrp
router eigrp 100
 network 10.0.0.0
 auto-summary

R1#sh run int ser 0/0
Building configuration...

Current configuration : 119 bytes
!
interface Serial0/0
 description R1-->R2
 bandwidth 64
 ip address 10.1.102.1 255.255.255.248
 clock rate 64000
end


The other two routers have similar configs. Unfortunately this is the only router image I have.

EDIT: It appears to have finally stabilized but looks like it took almost 20 minutes to do so.

EDIT #2: Disregard the previous edit... when performing a wr mem, it started again.

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amike25
 Post subject: Re: EIGRP Issues...
PostPosted: Tue Sep 06, 2011 3:21 am 
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I had some issues that seemed similar to yours (routing protocol kept bouncing) and after spending some time troubleshooting the routing configuration it actually turned out it was just GNS3 acting up and that some of the links would just stop passing packets. They were showing up/up, but pings were not going across, hellos were not being sent etc.

Idlepc was set up correctly(CPU was 5%) so it definitelly wasn't that. Everything started working again after I shut down GNS3 and restarted it, however, it still does the same thing sometimes, randomly.
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mellowd
 Post subject: Re: EIGRP Issues...
PostPosted: Tue Sep 06, 2011 3:24 am 
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Steven King wrote:
It usually is at 100% for about 5 minutes after starting the routers but then drops to about 50%. I've done the idle pc and idle max changes suggested in the optimization thread. My workstation is a laptop with a Core 2 Duo at 1.66 and 2 GB of RAM.


Still sounds too high. How many routers are running? Are they all running the same image?

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Kaiga
 Post subject: Re: EIGRP Issues...
PostPosted: Tue Sep 06, 2011 4:26 am 
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Have you set any IdlePC values on the routers after you have run them?

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hunter_thom
 Post subject: Re: EIGRP Issues...
PostPosted: Tue Sep 06, 2011 10:39 am 
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My old-ass laptop can run about 20 3660's at 80% CPU or so. I didn't really spend a long time getting that idlepc. I used to have a better value that got me 20 3660's at more like 50% CPU, but I accidentally deleted it. Not too big a deal because 20 routers is more than enough for me at the moment on this laptop.

But if you are running 100% CPU perhaps you did not commit the idlepc to the db? How many boxes? Same image? Definitely try getting a good idlepc if that's how high your CPU is.

Finding a really good idlepc can take a while. Make a test lab with a bunch of routers, keep changing the idlepc and starting all routers. When you find one that keeps CPU low, grab that value and store it to db.

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dlots
 Post subject: Re: EIGRP Issues...
PostPosted: Tue Sep 06, 2011 11:16 am 
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do you intend to have auto-summary on?
don't know about the processor issue but that could be your up/down issue.

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Reggle
 Post subject: Re: EIGRP Issues...
PostPosted: Wed Sep 07, 2011 5:10 am 
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Try dropping the 'clock rate' command. In the most recent GNS3, I've noticed the clock rate set to 2Mbit on all links, and leaving it that way results in a stable network for me.

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ristau5741
 Post subject: Re: EIGRP Issues...
PostPosted: Wed Sep 07, 2011 11:28 am 
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Did you read the sticky thread at the top of the forum about Drastically decreasing CPU load in Dynamips ???
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Steven King
 Post subject: Re: EIGRP Issues...
PostPosted: Wed Sep 28, 2011 12:05 pm 
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Yes I did and that has been done. I was still seeing the 100% CPU usage.. but seems acceptable now; I don't get the odd EIGRP behavior, and the 100% cpu goes away after about 10 minutes or less.

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insidex
 Post subject: Re: EIGRP Issues...
PostPosted: Fri Aug 17, 2012 1:18 am 
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Hi all! I have the same issue with flapping eigrp on c3620-i-mz.123-24.bin ios (gns3). But when I try to use the c7200-adventerprisek9-mz.122-33.SRC1 ios the problem has disappeared! :D
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Steven King
 Post subject: Re: EIGRP Issues...
PostPosted: Fri Aug 17, 2012 12:08 pm 
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Yeah I've really noticed certain images have quirks - to be expected I guess.

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