Re: [j-nsp] Cut through and buffer questions

On 11/19/21 17:05, Thomas Bellman via juniper-nsp wrote: [1] Of the 12 Mbyte buffer space in Trident 2, which is used in QFX5100 and EX4600, 3 Mbyte is used for per-port dedicated buffers, and 9 Mbyte is shared between all ports. I believe on later chips an even larger

Re: [j-nsp] (no subject)

HI! Mark Thanks for your sharing, so this means QFX5K cannot do double tag (pop/swap/push inner tags) operation? BR! James On Wed, Nov 17, 2021 at 5:39 AM Mark Tees wrote: > Hi Chen, > > In my testing the operations that worked involve double tagged frames were: > > * match on both tags

Re: [j-nsp] Cut through and buffer questions

On Fri, 19 Nov 2021 at 17:12, Thomas Bellman via juniper-nsp wrote: > Cut-through actually *can* help a little bit. The buffer space in > the Trident and Tomahawk chips is mostly shared between all ports; > only a small portion of it is dedicated per port[1]. If you have > lots of traffic on

Re: [j-nsp] Cut through and buffer questions

Can you please share the output of: show class-of-service shared-buffer on your QFX5100 ? Cheers James Il giorno ven 19 nov 2021 alle ore 11:58 Thomas Bellman ha scritto: > On 2021-11-19 09:49, james list via juniper-nsp wrote: > > > I try to rephrase the question you do not understand: if I

Re: [j-nsp] Cut through and buffer questions

On 2021-11-19 10:07, Saku Ytti via juniper-nsp wrote: > Cut-through does nothing, because your egress is congested, you can > only use cut-through if egress is not congested. Cut-through actually *can* help a little bit. The buffer space in the Trident and Tomahawk chips is mostly shared

Re: [j-nsp] Cut through and buffer questions

On 2021-11-19 09:49, james list via juniper-nsp wrote: > I try to rephrase the question you do not understand: if I enable cut > through or change buffer is it traffic affecting ? On the QFX 5xxx series and (at least) EX 46xx series, the forwarding ASIC needs to reset in order to change between

Re: [j-nsp] Cut through and buffer questions

On Fri, 19 Nov 2021 at 11:50, james list wrote: > I also understood cut through cannot help but obviously I cannot change QFX > switches because we loss few udp packets for a single application, the idea > could be to change shared buffers for unused queues and add to used one, > correct ?

Re: [j-nsp] Cut through and buffer questions

Hi I mentioned MX and QFX (output related QFX5100) in first email because traffic pattern spread both. I never mentioned internet. I also understood cut through cannot help but obviously I cannot change QFX switches because we loss few udp packets for a single application, the idea could be to

Re: [j-nsp] Cut through and buffer questions

On Fri, 19 Nov 2021 at 10:49, james list wrote: Hey, > I try to rephrase the question you do not understand: if I enable cut through > or change buffer is it traffic affecting ? There is no cut-through and I was hoping after reading the previous email, you'd understand why it won't help you

Re: [j-nsp] Cut through and buffer questions

Hi ytti I try to rephrase the question you do not understand: if I enable cut through or change buffer is it traffic affecting ? Regarding the drops here the outputs (15h after clear statistics): Physical interface: xe-0/0/19, Enabled, Physical link is Up Interface index: 939, SNMP ifIndex: