It is something to be aware of that is for sure Thanks! Jason Maynard
________________________________ From: Marko Milivojevic <[email protected]> To: Jason Maynard <[email protected]> Cc: garry baker <[email protected]>; [email protected] Sent: Mon, September 20, 2010 12:33:36 PM Subject: Re: [OSL | CCIE_RS] QOS - Flow Control The default is disabled, yes. Do you have the default configuration on the lab switch you are working on in the CCIE lab? -- Marko Milivojevic - CCIE #18427 Senior Technical Instructor - IPexpert FREE CCIE training: http://bit.ly/vLecture Mailto: [email protected] Telephone: +1.810.326.1444 Web: http://www.ipexpert.com/ On Mon, Sep 20, 2010 at 04:29, Jason Maynard <[email protected]> wrote: > Good article but it does finish off by saying flowcontrol is off by default > > > > Last paragraph > > > > This is why it’s always advised to turn off 802.3X flow control whether you > enable MLS QoS on a Cisco switch be it 3550 or 3560. By default flowcontrol > is disabled and you can only enable a Cisco switch to receive PAUSE frames, > but not to send them. > > > > If AutoQoS does not perform any “flowcontrol” configuration then is it > required if the default setting is disabled? > > > > I guess if it was enabled (part of a startup-config) then it would need to > be disabled when leveraging QoS. > > > > > > > > > > From: garry baker [mailto:[email protected]] > Sent: September-19-10 7:04 PM > > To: Jason Maynard > Cc: [email protected] > Subject: Re: [OSL | CCIE_RS] QOS - Flow Control > > > > article on this: > > http://blog.ine.com/2008/07/08/8023x-flow-control/ > > > -- > Garry L. Baker > > "There is no 'patch' for stupidity." - www.sqlsecurity.com > > On Sun, Sep 19, 2010 at 4:55 PM, Jason Maynard <[email protected]> > wrote: > > I was thinking that maybe auto qos would help me determine whether it was > needed or not. > > 3560 > ____ > > Tried "auto qos voip trust" on a GIG interface after disabling QOS, there > were no changes in regards to flowcontrol > > interface GigabitEthernet0/1 > shutdown > srr-queue bandwidth share 10 10 60 20 > queue-set 2 > priority-queue out > mls qos trust cos > auto qos voip trust > > > So I am thinking that you do not need to turn off flowcontrol on 3560. Time > to do the same test on 3550 > > > 3550 > ____ > > Tried "auto qos voip trust" on a GIG interface after disabling QOS, there > were no changes in regards to flowcontrol > > interface GigabitEthernet0/2 > description R2 - Gi0/0 > switchport access vlan 222 > switchport mode access > switchport nonegotiate > mls qos trust cos > auto qos voip trust > wrr-queue bandwidth 10 20 70 1 > wrr-queue queue-limit 50 25 15 10 > wrr-queue cos-map 1 0 1 > wrr-queue cos-map 2 2 4 > wrr-queue cos-map 3 3 6 7 > wrr-queue cos-map 4 5 > priority-queue out > spanning-tree portfast trunk > > :( > > Well I am off to find it in the 3560 guide but at first glance there is not > references regarding flowcontrol > > >http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_25_se/configuration/guide/swqos.html#wp1231112 >2 > > > -----Original Message----- > From: Marko Milivojevic [mailto:[email protected]] > Sent: September-19-10 5:34 PM > To: Jason Maynard > Cc: [email protected] > Subject: Re: [OSL | CCIE_RS] QOS - Flow Control > > I think the manual says something about it having to be disabled for > proper operation. > > -- > Marko Milivojevic - CCIE #18427 > Senior Technical Instructor - IPexpert > > FREE CCIE training: http://bit.ly/vLecture > > Mailto: [email protected] > Telephone: +1.810.326.1444 > Web: http://www.ipexpert.com/ > > On Sun, Sep 19, 2010 at 23:19, Jason Maynard <[email protected]> > wrote: >> Do you need to turn off “flowcontrol” on 3560? >> >> >> >> When you enable “mls qos” on 3550 you get the following message >> >> >> >> Cat1(config)#mls qos >> >> QoS: ensure flow-control on all interfaces are OFF for proper operation. >> >> >> >> On 3560 no message in displayed >> >> >> >> Cat2(config)#mls qos >> >> >> >> Thoughts? ..... >> >> >> >> I know I could have looked it up but I thought I would share this so >> everyone becomes aware. >> >> _______________________________________________ >> For more information regarding industry leading CCIE Lab training, please >> visit www.ipexpert.com >> >> > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > >
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