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/1 2.2_25_se/configuration/guide/swqos.html#wp1231112 -----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
