แด่เธอ.....คนนั้น

2007/Mar/02

ต้องเก็บไว้ครับ.... เพื่องาน

I want to apply the config below to allow all citrix (port 1494) to be

marked with the precedence bit #2. The reason for this is my serial
interface of the router at this remote location communicates through an
MPLS network that has multiple routers (managed by Qwest) that it
communicates through before it communicates with our central location.
My service provider told me to mark all citrix traffic with the
precedence value of 2 and they give it its proper priority when
communicating through their MPLS WAN.

2 questions
Does the configuration below do the job of marking citrix traffic with
precedence 2 so that the service provider can it its proper priority?
What command command can I use to make sure that Citrix never consumes
more than 65 percent of available bandwith even when available?

access-list 112 permit tcp any any precedence immediate eq 1494
!
class-map match-any citrix
match access-group 112
!
policty map citrixtraffic
class citrix
priority percent 65
!
int serial 0
service-policy output citrixtraffic

posted by zeous21, at 2007-Mar-02 07:49:021

2007/Mar/02

Set Config Qos in Switch

CCNP Self-Study: Understanding and Implementing Quality of Service in Cisco Multilayer Switched Networks

Configuration Exercise: Configuring QoS on Cisco IOSBased Catalyst Switches

Complete this configuration exercise to familiarize yourself with basic QoS configuration on Cisco IOSbased Catalyst switches as discussed in this chapter.

Required Resources

The resources and equipment required to complete this exercise are as follows (the last two items are optional):

Catalyst 3550
Terminal server or workstation connected directly to the console port of the Catalyst 3550 or out-of-band access to the Catalyst 3550
Cisco IP Phones infrastructure supporting voice calls (this resource verifies the configuration and is not mandatory)
Traffic generator (this resource verifies the configuration and is not mandatory)

Exercise Objective

The purpose of this exercise is to configure a Cisco IOSbased Catalyst switch for the following QoS features:

Classification
Marking
Policing
Congestion management
Congestion avoidance

The exercise exposes topics such as VLANs and spanning tree found in others chapters of this book. Nevertheless, the main purpose of this exercise is to demonstrate a QoS configuration. In this configuration exercise, your goal is to configure a Catalyst 3550 for the following QoS features:

Trust ingress DSCP values for interfaces FastEthernet0/1 through 0/10 when a Cisco IP Phone is attached
Reclassify frames on interface FastEthernet0/11 for a CoS value of 4
Mark ingress TCP Port 30000 frames on interface FastEthernet0/12 with a DSCP value of16
Apply strict-priority queuing for VoIP traffic
Configure high-priority queues to have a 2-to-1 (2:1) priority over low-priority queues

Network Diagram

Figure 10-18 shows the network layout for this configuration exercise

Command List

In this configuration exercise, you will use the commands listed in Table 10-7, which are in alphabetical order so that you can easily locate the information you need. Refer to this list if you need configuration command assistance during the configuration exercise. The table includes only the specific parameters used in the example and not all the available options for the command

mls qos	Globally enables QoS
mls qos trust device cisco-phone	Interface configuration command for trusting when a Cisco Phone is learned via CDP on the respective interface; works in conjunction with the mls qos trust dscp and mls qos trust cos commands
mls qos trust dscp	Interface configuration command for trusting DSCP values for ingress frames
no shutdown	Configures an interface in the Administrative UP state
policy-map policy_map_name	Enters the policy-map configuration submode
priority-queue out	Configures queue 4 on the Catalyst 3550 family of switches as a priority queue
service-policy input \| output policy-map-name	Maps a policy map to an interface for ingress or egress traffic
set ip dscp dscp_value	Policy-map class action for marking DSCP
show mls qos interface FastEthernet \| GigabitEthernet interface	Displays the trusting configuration of an interface
spanning-tree portfast	Configures an interface for the spanning-tree PortFast feature
Switchport	Configures an interface for Layer 2 operation
switchport access vlan vlan-id	Configures an interface for a specific VLAN-ID
vlan vlan-id	Adds or removes a VLAN-ID in the VLAN database
wrr-queue bandwidth weight1 weight2 weight3 weight4	For weight1 weight2 weight3 weight4, enter the ratio that determines the frequency in which the WRR scheduler dequeues packets; separate each value with a space (the range is 1 to 65536)
wrr-queue cos-map queue-id cos1 ... cos8	Configures CoS value to egress queue mapping

Task 1: Globally Enable QoS

Step1 Connect the Catalyst switch to a terminal server or directly to the workstation's serial port for in-band connectivity.

Step2 Globally enable QoS features on the switch.

Switch#configure terminal
Switch(config)#mls qos

Step3 Verify that QoS is globally enabled.

Switch(config)#do show mls qos
QoS is enabled

NOTE

The Cisco IOS do command is a recent addition to Cisco IOS to allow execution of privileged mode commands within configuration mode. This command saves the time and annoyance of exiting out and re-entering configuration mode. do is only found in the most recent Cisco IOS version, so it may not be supported in your version. If not, exit configuration mode and type the command (minus the keyword do) in privileged mode.

Recall that for the Catalyst 4000 and 4500 families of switches running Cisco IOS, qos commands are not prefixed with the keyword mls.

Task 2: Configure the Switch to Trust DSCP on Interfaces FastEthernet0/1 Through 0/10 If a Cisco IP Phone Is Attached

Step1 Enter the range command to configure multiple interfaces simultaneously.

Switch(config)#interface range FastEthernet 0/1 -10

Step2 Specify an access VLAN for IP Phones (voice VLANs are not used in this exercise).

Switch(config-if-range)#switchport access vlan 500

Step3 Configure the switch to trust DSCP for incoming frames only if Cisco IP Phones are attached to the interface.

Switch(config-if-range)#mls qos trust dscp
Switch(config-if-range)#mls qos trust device cisco-phone

Step4 Configure the interfaces for spanning-tree PortFast.

Switch(config-if-range)#spanning-tree portfast
%Warning: portfast should only be enabled on ports connected to a single
 host. Connecting hubs, concentrators, switches, bridges, etc... to this
 interface when portfast is enabled, can cause temporary bridging loops.
 Use with CAUTION
%Portfast will be configured in 10 interfaces due to the range command
 but will only have effect when the interfaces are in a non-trunking mode.

Step5 Enable the interfaces.

Switch(config-if-range)#no shutdown

Step6 Verify the QoS configuration.

Switch#show mls qos interface FastEthernet 0/1
FastEthernet0/1
trust state: not trusted
trust mode: trust dscp
COS override: dis
default COS: 0
DSCP Mutation Map: Default DSCP Mutation Map
trust device: cisco-phone

Task 3: Configure the Switch to Classify All Incoming Frames on Interface FastEthernet 0/11 with a CoS Value of 4 for Untagged Frames

Step1 Enter the interface configuration mode for FastEthernet0/11.

Switch(config)#interface FastEthernet 0/11

Step2 Configure the interface to classify all ingress frames with a CoS value of 4.

Switch(config-if)#mls qos cos 4

Step3 Verify the QoS configuration.

Switch#(config-if)#do show mls qos interface FastEthernet 0/11
FastEthernet0/11
trust state: not trusted
trust mode: not trusted
COS override: dis
default COS: 4
DSCP Mutation Map: Default DSCP Mutation Map
trust device: none

Task 4: Configure a Policy Map, Class Map, and the Interface Such That All Ingress TCP Port 30000 Packets on FastEthernet0/11 Have Their DSCP Set to 16

Step1 Configure an access list to match packets on TCP port 30000.

Switch(config)#access-list 100 permit tcp any any eq 30000

Step2 Configure a traffic profile using a class map.

Switch(config)#class-map TCP-PORT-30k
Switch(config-cmap)#match access-group 100
Switch(config-cmap)#exit

Step3 Configure a policy map to apply the class map in Step 2 to the class action of setting the DSCP to 16.

Switch(config)#policy-map BCMSN
Switch(config-pmap)#class TCP-PORT-30k
Switch(config-pmap-c)#set ip dscp 16
Switch(config-pmap-c)#exit
Switch(config-pmap)#exit

Step4 Apply the policy-map ingress on interface FastEthernet0/11.

Switch(config)#interface FastEthernet 0/11
Switch(config-if)#service-policy input BCMSN
Switch(config-if)#exit

Step5 Verify the policy-map configuration.

Switch#show policy-map interface FastEthernet 0/11

 FastEthernet0/11

 service-policy input: BCMSN

  class-map: TCP-PORT-30k (match-all)
   0 packets, 0 bytes
   5 minute offered rate 0 bps, drop rate 0 bps
   match: access-group 100

  class-map: class-default (match-any)
   0 packets, 0 bytes
   5 minute offered rate 0 bps, drop rate 0 bps
   match: any
    0 packets, 0 bytes
    5 minute rate 0 bps

Task 5: Configure All Egress Queues Such That CoS Values 4, 6, and 7 Use Queue 3 and a CoS Value of 5 Uses Queue 4

Step1 Enter the range command to configure multiple interfaces simultaneously.

Switch(config)#interface range FastEthernet 0/1 -24

Step2 Configure interfaces for appropriate CoS mapping.

Switch(config-if)#wrr-queue cos-map 4 5
Switch(config-if)#wrr-queue cos-map 3 4 6 7
Switch(config-if)#exit

Task 6: Configure Queue 4 as a Strict-Priority Queue

Step1 Enter the range command to configure multiple interfaces simultaneously.

Switch(config)#interface range FastEthernet 0/1 -24

Step2 Configure queue 4 as a strict-priority queue.

Switch(config-if)#priority-queue out

Task 7: Configure WRR Weights Such That Queue 3 Receives Twice as Much Service as Any Other Single Queue

Step1 Enter the range command to configure multiple interfaces simultaneously.

Switch(config)#interface range FastEthernet 0/1 -24

Step2 Configure queue 3 with twice the service level as that of any other queue.

Switch(config-if)#wrr-queue bandwidth 20 20 40 20

Step3 Verify the WRR configuration.

Switch#show mls qos interface FastEthernet 0/1 queueing
FastEthernet0/1
Egress expedite queue: ena
wrr bandwidth weights:
qid-weights
 1 - 20
 2 - 20
 3 - 40
 4 - 20  when expedite queue is disabled
Cos-queue map:
cos-qid
 0 - 1
 1 - 1
 2 - 2
 3 - 2
 4 - 3
 5 - 4
 6 - 3
 7 - 3

Task 8: Verify All Configurations by Viewing Interface Statistics

Switch#show mls qos interface FastEthernet 0/1 statistics
FastEthernet0/1
Ingress
 dscp: incoming  no_change classified policed  dropped (in bytes)
Others: 97663325  87828650  9834675  0     0
Egress
 dscp: incoming  no_change classified policed  dropped (in bytes)
Others: 30540345   n/a    n/a   0     0