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MICE-DISCUSS  October 2011

MICE-DISCUSS October 2011

Subject:

Re: Speed or duplex mismatch?

From:

Jeremy Lumby <[log in to unmask]>

Reply-To:

MICE Discuss <[log in to unmask]>

Date:

Mon, 3 Oct 2011 10:16:00 -0500

Content-Type:

text/plain

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Parts/Attachments

text/plain (66 lines)

I agree that the regular period of the drop does lead me to believe that it is not a physical issue.  I was wondering it it might be the autodetect interval of the Juniper switch, and if the MICE route server has a hardcoded speed/duplex if that might cause it at this regular loss frequency.  I was able to alternate this test between the HE router at 69.147.218.52 and the MICE route servers several times.  The HE router was always perfect, and the MICE route server was 0.5% lossy every time.  Is anyone available to check the Juniper to see if there are any errors on the ports feeding the route servers?

-----Original Message-----
From: MICE Discuss [mailto:[log in to unmask]] On Behalf Of Owen DeLong
Sent: Monday, October 03, 2011 9:59 AM
To: [log in to unmask]
Subject: Re: [MICE-DISCUSS] Speed or duplex mismatch?

Some flavors of Cisco will drop inbound ICMP if they feel busy. When this happens, they do it silently and do not count errors, etc.

I don't know if the NPE G2 is subject to this proclivity or not and I don't know how busy your router feels when you are doing this, but, the particularly regular pattern to the packet loss leads me to believe it is likely a CPU spike in the Cisco for some scheduled periodic task causing it to fail to process the inbound ICMP Echo Reply.

(Remember, ICMP to the router is punted to the slow-path CPU)

Owen
On Oct 3, 2011, at 7:47 AM, Jeremy Lumby wrote:

> This weekend I did some equipment upgrades, and while my BGP session re-established without a problem, I decided to ping the route servers to test connectivity.  I found that both route servers exhibited about a 0.5% loss.  I checked my interface counters, and I am not getting any errors, as well as I tried pinging a few other MICE members' routers and did not experience any loss.  I am wondering if there is a speed/duplex mismatch between the route servers and the switch, or if there might be something running on the route servers that is intentionally dropping packets as some form of DoS protection.  The following ping was performed from my Cisco 7206VXR that is directly connected to MICE via the gig port that is built into the G2 processor.
> 
> 511Edge01#ping 69.147.218.1 repeat 1000
> 
> Type escape sequence to abort.
> Sending 1000, 100-byte ICMP Echos to 69.147.218.1, timeout is 2 seconds:
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !!!!!!!!!!!!!!!!!!!.
> Success rate is 99 percent (995/1000), round-trip min/avg/max = 1/1/4 
> ms
> 
> Jeremy Lumby
> Minnesota VoIP
> 9217 17th Ave S
> Suite 216
> Bloomington, MN 55425
> Main: 612-355-7740
> Direct: 612-392-6814
> E-Fax: 952-873-7425
> [log in to unmask]
> 
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