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MTU
- Subject: MTU
- From: lukasz at bromirski.net (Łukasz Bromirski)
- Date: Fri, 22 Jul 2016 20:35:14 +0200
- In-reply-to: <[email protected]>
- References: <CAPkb-7CRMNUK6Av-BBzUgMLh2YW0XfxDs4x4P4rJg6ookVNP=A@mail.gmail.com> <CAPkb-7CTi_ekX35OcjdwqfM+W-gdkfkfpLsHXxhH5bVr=nyv3A@mail.gmail.com> <CAPkb-7CnxtLuWWA+PDx2ba_xkaE54+Ei4NAbZp7TzvgdGi2Auw@mail.gmail.com> <CAPkb-7B3geM2iydgmidq+gFh4oJvzbCj_eznQSvLRhi3LGgvCA@mail.gmail.com> <CAPkb-7C78wAAYrdfgZB65W=tJRumUb3qbVGVE1u28V7DTP82Ww@mail.gmail.com> <CAPkb-7A1RsiN=tv6YuggARbUx2u8EDOUyHc__BJ6iB=UFWxs4Q@mail.gmail.com> <CAPkb-7AQTQnuv9baaO=yEG0e+s0O1ppopafsCNoP8bSuCMysxg@mail.gmail.com> <CAPkb-7AXhoCrVnWv+pzbJGPW86mvzGmGuitqscqQ7AJFrriDRg@mail.gmail.com> <CAPkb-7BaGqybRDLRd01E65bmzoc-1ebnuYsEtYsSU8VLu5dp3A@mail.gmail.com> <CAPkb-7BAjMO2sdY=87J6S6yd8oecyr1gyJa_jqaQUy7=XU0oAw@mail.gmail.com> <CAPkb-7A5TgL+dL8D48sccHSCVcHWEah9sv3hZT-7j=kN4aKnYQ@mail.gmail.com> <CAPkb-7DtxSt=9vgBviZBSaxN57q=wkDJw+6m=RBmf01s9GtVXw@mail.gmail.com> <CAPkb-7AOoQ4=7cCuqwN96u-q5cBsr6q1aTnQ8sxW83LNqcjb2g@mail.gmail.com> <CAP-guGUcE_wrbZdZX7rO2nN1GGREuqVrWfJ37CqY7MRLBZTTSw@mail.gmail.com> <520e997e-9c83-3d1c- [email protected]>
> On 22 Jul 2016, at 19:37, Grzegorz Janoszka <Grzegorz at Janoszka.pl> wrote:
>
>> On 2016-07-22 15:57, William Herrin wrote:
>> On a link containing only routers, you can safely increase the MTU to
>> any mutually agreed value with these caveats:
>
> What I noticed a few years ago was that BGP convergence time was faster with higher MTU.
> Full BGP table load took twice less time on MTU 9192 than on 1500.
> Of course BGP has to be allowed to use higher MTU.
Quite obvious thing - BGP by default on Cisco and Juniper will use up to max allowed 4k message per packet, which for typical unicast IPv4/v6 helps to pack all attributes with prefix. This not only improves (lowers) CPU load on sending side but also on the receiving end and helps with routing convergence.
There was a draft to use up to 9k for BGP messaging, but I belive it's buried somewhere on the outside of town called "our current version RFC".
--
?ukasz Bromirski
- References:
- MTU
- From: baldur.norddahl at gmail.com (Baldur Norddahl)
- MTU
- From: bill at herrin.us (William Herrin)
- MTU
- From: Grzegorz at Janoszka.pl (Grzegorz Janoszka)