nanog mailing list archives
Re: common method to count traffic volume on IX
From: Nick Hilliard <nick () foobar org>
Date: Wed, 18 Sep 2013 23:59:35 +0100
On 18/09/2013 18:23, Leo Bicknell wrote:
Serious question, at an IXP shouldn't IN = OUT nearly perfectly?
if you host multicast on your unicast peering lan, then this will be affected by the unicast:multicast ratio and the number of recipient ports. Most networks which support multicast will also support multicast pruning, so in reality this counts for very little. Most IXPs rely on unicast flooding to determine forwarding paths, which adds a little to the outbound numbers. So on these IXPs, outbound aggregate is usually a tiny amount larger than inbound aggregate. The larger the network, the smaller this effect. And on networks which precompute forwarding paths, the in and out aggregate figures will be equal +/- counter entropy. Nick
Current thread:
- Re: common method to count traffic volume on IX, (continued)
- Re: common method to count traffic volume on IX Michael Hallgren (Sep 17)
- Re: common method to count traffic volume on IX Michael Hallgren (Sep 17)
- Re: common method to count traffic volume on IX Leo Bicknell (Sep 17)
- Re: common method to count traffic volume on IX Peter Kristolaitis (Sep 17)
- Re: common method to count traffic volume on IX Niels Bakker (Sep 17)
- Re: common method to count traffic volume on IX Leo Bicknell (Sep 18)
- Re: common method to count traffic volume on IX Niels Bakker (Sep 18)
- Re: common method to count traffic volume on IX Stephen Fulton (Sep 18)
- Re: common method to count traffic volume on IX Nick Hilliard (Sep 18)
- Re: common method to count traffic volume on IX Niels Bakker (Sep 19)
- Re: common method to count traffic volume on IX Nick Hilliard (Sep 18)
- Re: common method to count traffic volume on IX Patrick W. Gilmore (Sep 17)
- Re: common method to count traffic volume on IX Niels Bakker (Sep 18)
- Re: common method to count traffic volume on IX Randy Bush (Sep 18)
- Re: common method to count traffic volume on IX Randy Bush (Sep 18)
- Re: common method to count traffic volume on IX Niels Bakker (Sep 19)
- Re: common method to count traffic volume on IX Will Hargrave (Sep 19)
- Re: common method to count traffic volume on IX sthaug (Sep 19)
- common method to count traffic volume on IX Martin Hannigan (Sep 19)