Re: [SIG-IX] Jumbo Frames on IX

[Greg Hankins <ghankins@force10networks.com>]

I think there is value in supporting jumbo frames at IXs.  Based on my
experience as an equipment vendor, most routers made in the past several
years support jumbo frames up to 9216 bytes (9K) without any problem.

Tom Scholl gave a presentation at NANOG42 last year that covered some of
the MTU issues: http://www.nanog.org/meetings/nanog42/abstracts.php?pt=MTI1Jm5hbm9nNDI=&nm=nanog42 .

We asked what MTU people prefer to use on the 2008 peering survey:
   1518: 94
   4470: 27
   9216: 39
   Other: 6

Comments:
- Many use a larger MTU on PNIs
- Many would like to use larger MTU on public exchanges

Greg

-- 
Greg Hankins <ghankins@force10networks.com>
Technical Marketing
Force10 Networks
+1 404 542 5530

________________________________
From: Raphael Ho <raphael.ho@ap.equinix.com>
To: "sig-ix@lists.apnic.net" <sig-ix@lists.apnic.net>
Date: Sun, 9 Nov 2008 23:23:35 -0800
Subject: [SIG-IX] Jumbo Frames on IX

Hi everybody,

Thanks for your feedback on my last email regarding v4/v6 on the exchange. We’re rolling out the route-servers and IPv6 addresses on Equinix Exchanges across Asia (Singapore, Tokyo, Sydney and HK), so if anybody needs a port or an address, please feel free to let me know.

Now for another poll – on our new exchange in Hong Kong...

1. Is there value in enabling Jumbo Frames on the exchange?

2. If yes, what sized Jumbo frame do you want?
a) 1600 (baby giant)
b) 4470 (legacy MTU of FDDI, now default for POS links)
c) 9180 (RFC1209)
d) Other (please specify)

My personal concern is that there may be router/switch compatibilities – some people’s equipment may not support jumbo frames of any kind and cause potential issues (although chances are, most endpoint traffic is still 1500bytes these days – maybe life will be different in a few years when GPON brings fiber to everybody’s home). However, the world will be so much more efficient with a larger MTU.

Just wanted to hear your feedback

Regards,

Raf.

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