Arie, I understand the policed-dscp-transmit part of the policy however it's the CIR/BC/BE values that I'm questioning as based on the figures the CIR is set to 4Gbps so effectively the policed-dscp-transmit will never kick in and BC/BE are set to 32Megabytes. Basically this policy is applied to user access ports (1Gb) and also to 2 x 1Gb EtherChannel Trunk ports. What values should be applied for CIR/BC/BE on the edge if any? Craig
________________________________ From: Arie Vayner (avayner) [mailto:[email protected]] Sent: Wed 04/03/2009 13:16 To: Craig Allen; [email protected] Subject: RE: [c-nsp] Cisco 6509-E QoS Policy Confusion Craig, Basically you are making sure the customer is not abusing the different classes. For example any packet that goes beyond the policer in class EF_QOS_PORTS would be remarked (this is the " exceed-action policed-dscp-transmit violate-action policed-dscp-transmit" part) to a lower value. To see the value of the remark, you should use this command: router#show mls qos maps policed-dscp Normal Burst Policed-dscp map: (dscp= d1d2) d1 : d2 0 1 2 3 4 5 6 7 8 9 ------------------------------------- 0 : 00 01 02 03 04 05 06 07 08 09 1 : 10 11 12 13 14 15 16 17 18 19 2 : 20 21 22 23 24 25 26 27 28 29 3 : 30 31 32 33 34 35 36 37 38 39 4 : 40 41 42 43 44 45 46 47 48 49 5 : 50 51 52 53 54 55 56 57 58 59 6 : 60 61 62 63 Maximum Burst Policed-dscp map: (dscp= d1d2) d1 : d2 0 1 2 3 4 5 6 7 8 9 ------------------------------------- 0 : 00 01 02 03 04 05 06 07 08 09 1 : 10 11 12 13 14 15 16 17 18 19 2 : 20 21 22 23 24 25 26 27 28 29 3 : 30 31 32 33 34 35 36 37 38 39 4 : 40 41 42 43 44 45 46 47 48 49 5 : 50 51 52 53 54 55 56 57 58 59 6 : 60 61 62 63 For reference, search for "policed-dscp-transmit" on this page: http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/con figuration/guide/qos.html Usually this kind of policy is deployed on the ingress of the network (where a customer is connected) and the remark makes sure that any excess traffic from each class is marked down either to BE or a lower class (depends on policy) Arie -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Craig Allen Sent: Wednesday, March 04, 2009 14:26 To: [email protected] Subject: [c-nsp] Cisco 6509-E QoS Policy Confusion Hello, I have recently taken over a network and have a question about a current QoS policy and am trying to understand why it would have been configured this way. An excerpt of the questionable config is as follows: policy-map apply_1000_qos_for_att_dscp_to_nextlevel class EF_QOS_PORTS police cir 4000000000 bc 3125000 be 31250000 conform-action set-dscp-transmit ef exceed-action policed-dscp-transmit violate-action policed-dscp-transmit class af31_QOS_PORTS police cir 4000000000 bc 31250000 be 31250000 conform-action set-dscp-transmit af31 exceed-action policed-dscp-transmit violate-action policed-dscp-transmit class af21_QOS_PORTS police cir 1000000000 bc 31250000 be 31250000 conform-action set-dscp-transmit af21 exceed-action policed-dscp-transmit violate-action policed-dscp-transmit ! The above policy has been applied to all Gig interfaces on the 6509 blades. What I'm trying to understand is the CIR / BC / BE settings and exactly what they will achieve. My first initial thought is that the CIR/BC/BE settings will achieve nothing? Thanks! Craig _______________________________________________ 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/
