nanog mailing list archives
Re: mtu question. more should be better, right?
From: David Newman <dnewman () networktest com>
Date: Mon, 07 Nov 2011 10:41:32 -0800
On 11/7/11 8:45 AM, Deric Kwok wrote:
When I setup the server mtu as 9100. why I have to configure the switch mtu 9300 to make it working? What this extra 200 bytes is for what purpose? ls it standard?
MTUs above 2000 bytes are nonstandard. The most recent Ethernet spec, 802.3-2008, defines a maxBasicFrameSize of 1518 octets and a maxEnvelopeFrameSize size of 2000 octets to accommodate various encap mechanisms.
What is disadvantage of setting our all internal networks (host / equipment) mtu more than 1500?
In a single data center at 1-Gbit/s rates or above, probably none, provided all devices support and use the same MTU. In other scenarios jumbos can lead to the various problems Iljitsch mentioned. dn
Current thread:
- mtu question. more should be better, right? Deric Kwok (Nov 07)
- Re: mtu question. more should be better, right? Iljitsch van Beijnum (Nov 07)
- Re: mtu question. more should be better, right? David Newman (Nov 07)