nanog mailing list archives
Re: Network management software with high detailed traffic report
From: Jon Lewis <jlewis () lewis org>
Date: Mon, 22 Nov 2010 17:19:32 -0500 (EST)
On Mon, 22 Nov 2010, Brandon Ross wrote:
On Mon, 22 Nov 2010, Nick Hilliard wrote:some do, some don't. For example, sup720 snmp counters are updated every 9 seconds, while the "show interface" counters are updated every 30 seconds.That is most certainly NOT true. The 'show interface' counters update at least once a second. Perhaps you are thinking about the rate counters that are often _configured_ to use the last 30 seconds of data to compute the average but also update much more often than every 30 seconds (and default to a 5 minute average).
I didn't think it was true either...but after reading Nick's message I checked a X6408A interface on one of our sup720's running "relatively" recent code (SXI1), and there definitely is some time between updates both the packet counters and the time averaged rates.
Just repeating the command and looking at my watch, I'd say Nick is right. It's easy to test yourself. Pick an int, and repeat "sh int <int name> | inc packets. The numbers really don't change but every 9 seconds or so. Same goes for the avg numbers...mine are set to 30 sec load interval, and they only change every ~9 seconds.
This does vary by platform. 3550 swiches and 7200 routers both seem to update the counters about 1/s. Maybe the delayed updates are just a 6500 thing.
---------------------------------------------------------------------- Jon Lewis, MCP :) | I route Senior Network Engineer | therefore you are Atlantic Net | _________ http://www.lewis.org/~jlewis/pgp for PGP public key_________
Current thread:
- Network management software with high detailed traffic report Sergey Voropaev (Nov 22)
- Re: Network management software with high detailed traffic report sthaug (Nov 22)
- Re: Network management software with high detailed traffic report Sergey Voropaev (Nov 22)
- Re: Network management software with high detailed traffic report Nick Hilliard (Nov 22)
- Re: Network management software with high detailed traffic report Brandon Ross (Nov 22)
- Re: Network management software with high detailed traffic report Nick Hilliard (Nov 22)
- Re: Network management software with high detailed traffic report bross (Nov 22)
- RE: Network management software with high detailed traffic report Frank Bulk - iName.com (Nov 22)
- Re: Network management software with high detailed traffic report Jon Lewis (Nov 22)
- Re: Network management software with high detailed traffic report Tassos Chatzithomaoglou (Nov 22)
- Re: Network management software with high detailed traffic report Nick Hilliard (Nov 22)
- Re: Network management software with high detailed traffic report Tassos Chatzithomaoglou (Nov 23)
- Re: Network management software with high detailed traffic report Sergey Voropaev (Nov 22)
- Re: Network management software with high detailed traffic report sthaug (Nov 22)
- Re: Network management software with high detailed traffic report Jack Bates (Nov 23)
- Re: Network management software with high detailed traffic report Livio Zanol Puppim (Nov 22)
- Re: Network management software with high detailed traffic report Nick Hilliard (Nov 22)
- Re: Network management software with high detailed traffic report Livio Zanol Puppim (Nov 22)
- <Possible follow-ups>
- Re: Re: Network management software with high detailed traffic report Ivan Brunello (Nov 26)
- Re: Network management software with high detailed traffic report Diogo Montagner (Nov 26)
- Re: Network management software with high detailed traffic report Jeff Gehlbach (Nov 26)
- Re: Network management software with high detailed traffic report Diogo Montagner (Nov 26)