Cheers Adam - I applied what Spyros suggested, and will continue to monitor.
________________________________________ From: Adam Vitkovsky <[email protected]> Sent: Wednesday, 16 September 2015 8:14 PM To: CiscoNSP List; James Bensley; [email protected] Subject: RE: [c-nsp] Tail drops on ME3600 with shaping policy Hi The following worked for me (you can be service-instance specific) policy-map customer1-parrent-out ! class class-default shape average 10 mbps service-policy customer1-child-out policy-map customer1-child-out ! class voip-edge police cit 128000 conform-action transmit exceed-action drop priority level 1 queue-limit percent 100 ! class class-default queue-limit percent 100 interface GigabitEthernet0/7 service instance 11 ethernet service-policy out customer1-parrent-out adam Adam Vitkovsky IP Engineer T: 0333 006 5936 E: [email protected] W: www.gamma.co.uk This is an email from Gamma Telecom Ltd, trading as “Gamma”. The contents of this email are confidential to the ordinary user of the email address to which it was addressed. This email is not intended to create any legal relationship. No one else may place any reliance upon it, or copy or forward all or any of it in any form (unless otherwise notified). If you receive this email in error, please accept our apologies, we would be obliged if you would telephone our postmaster on +44 (0) 808 178 9652 or email [email protected] Gamma Telecom Limited, a company incorporated in England and Wales, with limited liability, with registered number 04340834, and whose registered office is at 5 Fleet Place London EC4M 7RD and whose principal place of business is at Kings House, Kings Road West, Newbury, Berkshire, RG14 5BY. ________________________________________ From: cisco-nsp [[email protected]] on behalf of CiscoNSP List [[email protected]] Sent: 16 September 2015 10:10 To: James Bensley; [email protected] Subject: Re: [c-nsp] Tail drops on ME3600 with shaping policy Thanks very much James - Very helpful! So there's no singular way I can test this (queue-limit percent 100) on a single service instance under an Interface? i.e. Id have to re-do the entire qos policy for the Interface and associated service instances? In our current situation, we have ~30 service instances, all varying subscribed speeds under one Interface...only a few of them are showing tail drops, so I was hoping to test the queue limit "fix" on one or two of them...but from what Im reading in your reply, this doesnt look to be possible? Cheers. ________________________________________ From: James Bensley <[email protected]> Sent: Wednesday, 16 September 2015 6:24 PM To: CiscoNSP List; [email protected] Subject: Re: [c-nsp] Tail drops on ME3600 with shaping policy Make sure you are on a decent recent image (worked fine for me from 15.3(3)S3 up to 15.3(3)S6 (haven't ventured into 15.4 or 15.5) and pretty much "queue-limit percent 100" everywhere is the way forward with these boxes. I made some notes on this when I was having the same problem here, I'm a bit fuzzy on it now because it "just works", hopefully that will clear some things up: http://null.53bits.co.uk/index.php?page=me3600-3800-buffer-oversubscription Short version though, the ME3600's/ME3800's use a 3 tiered map to so you can apply different QoS policies at different levels in the switch, at the port level, service instance or VLAN level, then down at the individual traffic class level. Try this with your configuration, note the parent policy is matching customer VLANs, we then apply the child policy to that VLAN, otherwise using your config we are trying to set queue-limit percent 100 to the entire port when we have multiple VLANs here (which we shall assume are different customers) and they might have different QoS SLAs, so we need to match more specifically down to that customer class before we can increase the buffers): int foo service-policy output int_foo_parent_policy service instance 1065 ethernet description CUST_A encapsulation dot1q 1065 rewrite ingress tag pop 1 symmetric bridge-domain 1065 service instance 1066 ethernet description CUST_A encapsulation dot1q 1066 rewrite ingress tag pop 1 symmetric bridge-domain 1066 service instance 1067 ethernet description CUST_B encapsulation dot1q 1067 rewrite ingress tag pop 1 symmetric bridge-domain 1067 class-map match-any CUST1-VLANs match vlan 1065 match vlan 1066 class-map match-any CUST2-VLANs match vlan 1067 policy-map child_policy_map class class-default queue-limit percent 100 policy-map int_foo_parent_policy class CUST1-VLANs shape average 100000000 service-policy child_policy_map class CUST2-VLANs shape average 200000000 service-policy child_policy_map Cheers, James. _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
