© 2005 Cisco Systems, Inc. All rights reserved. IPTX v2.06-1 Introducing IP Quality of Service Implementing AutoQoS. - презентация

1 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v Introducing IP Quality of Service Implementing AutoQoS

2 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v Outline Overview AutoQoS AutoQoS: Router Platforms AutoQoS: Switch Platforms AutoQoS Prerequisites Configuring AutoQoS Monitoring AutoQoS Automation with Cisco AutoQoS Summary

3 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v AutoQoS One command per interface to enable and configure QoS

4 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v AutoQoS One command per interface to enable and configure QoS

5 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v AutoQoS (Cont.) interface Multilink1 ip address ip tcp header-compression iphc-format load-interval 30 service-policy output QoS-Policy ppp multilink ppp multilink fragment-delay 10 ppp multilink interleave multilink-group 1 ip rtp header-compression iphc-format ! interface Serial0 bandwidth 256 no ip address encapsulation ppp no ip mroute-cache load-interval 30 no fair-queue ppp multilink multilink-group 1 interface Serial0 bandwidth 256 ip address auto qos voip AutoQoS Manual QoS

6 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v AutoQoS (Cont.) Application Classification –Automatically discovers applications and provides appropriate QoS treatment Policy Generation –Automatically generates initial and ongoing QoS policies Configuration –Provides high level business knobs, and multi-device / domain automation for QoS Monitoring & Reporting –Generates intelligent, automatic alerts and summary reports Consistency –Enables automatic, seamless interoperability among all QoS features and parameters across a network topology – LAN, MAN, and WAN

7 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v AutoQoS: Router Platforms Cisco 1760, 2600, 3600, 3700 and 7200 Series Routers User can meet the voice QoS requirements without extensive knowledge about: –Underlying technologies (i.e.: PPP, FR, ATM) –Service policies –Link efficiency mechanisms AutoQoS lends itself to tuning of all generated parameters & configurations

8 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v AutoQoS: Switch Platforms Cisco Catalyst 6500, 4500, 3550, 3560, 2970 and 2950(EI) Switches User can meet the voice QoS requirements without extensive knowledge about: –Trust boundary –CoS to DSCP mappings –Weighted Round Robin (WRR) & Priority Queue (PQ) Scheduling parameters Generated parameters and configurations are user tunable EI

9 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v AutoQoS: Switch Platforms (Cont.) Single command at the interface level configures interface and global QoS –Support for Cisco IP Phone & Cisco Soft Phone Support for Cisco Soft Phone currently exists only on the Cat6500 –Trust Boundary is disabled when IP Phone is moved/relocated –Buffer Allocation & Egress Queuing dependent on interface type (GE/FE) Supported on Static, dynamic-access, voice VLAN access, and trunk ports CDP must be enabled for AutoQoS to function properly

10 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v Configuring AutoQoS: Prerequisites for Using AutoQoS Cisco Express Forwarding (CEF) must be enabled at the interface or ATM PVC This feature cannot be configured if a QoS policy (service policy) is attached to the interface An interface is classified as low-speed if its bandwidth is less than or equal to 768 kbps. It is classified as high-speed if its bandwidth is greater than 768 kbps –The correct bandwidth should be configured on all interfaces or sub-interfaces using the bandwidth command –If the interface or sub-interface has a link speed of 768 kbps or lower, an IP address must be configured using the ip address command

11 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v Configuring AutoQoS: Routers auto qos voip [trust] [fr-atm] router(config-if)# or router(config-fr-dlci)# Configures the AutoQoS VoIP feature Untrusted mode by default trust: Indicates that the differentiated services code point (DSCP) markings of a packet are trusted (relied on) for classification of the voice traffic fr-atm: For low-speed Frame Relay DLCIs interconnected with ATM PVCs in the same network, the fr-atm keyword must be explicitly configured in the auto qos voip command to configure the AutoQoS VoIP feature properly

12 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v Configuring AutoQoS: Cisco Catalyst 6500 Switch Console>(enable)set qos autoqos QoS is enabled All ingress and egress QoS scheduling parameters configured on all ports.CoS to DSCP, DSCP to COS, IP Precedence to DSCP and policed dscp maps configured. Global QoS configured, port specific autoqos recommended: set port qos autoqos trust set port qos autoqos voip set qos autoqos Console> (enable) Global configuration command All the global QoS settings are applied to all ports in the switch Prompt displays showing the CLI for the port-based automatic QoS commands currently supported

13 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v Configuring AutoQoS: Cisco Catalyst 6500 Switch (Cont.) set port qos autoqos trust [cos|dscp] Console> (enable) trust dscp and trust cos are automatic QoS keywords used for ports requiring a "trust all" type of solution. trust dscp should be used only on ports that connect to other switches or known servers as the port will be trusting all inbound traffic marking Layer 3 (DSCP) trust cos should only be used on ports connecting other switches or known servers as the port trusts all inbound traffic marking in Layer 2 (CoS). The trusted boundary feature is disabled and no QoS policing is configured on these types of ports

14 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v Configuring AutoQoS: Cisco Catalyst 6500 Switch (Cont.) set port qos autoqos voip [ciscosoftphone | ciscoipphone] Console> (enable) ciscosoftphone The trusted boundary feature must be disabled for Cisco SoftPhone ports QoS settings must be configured to trust the Layer 3 markings of the traffic that enters the port Only available on Catalyst 6500 ciscoipphone The port is set up to trust-cos as well as to enable the trusted boundary feature Combined with the global automatic QoS command, all settings are configured on the switch to properly handle the signaling and voice bearer and PC data entering and leaving the port CDP must be enabled for the ciscoipphone QoS configuration

15 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v Configuring AutoQoS: Catalyst 2950EI, 3550 Switches auto qos voip trust Switch(config-if)# The uplink interface is connected to a trusted switch or router, and the VoIP classification in the ingress packet is trusted auto qos voip cisco-phone Switch(config-if)# Automatically enables the trusted boundary feature, which uses the CDP to detect the presence or absence of a Cisco IP Phone If the interface is connected to a Cisco IP Phone, the QoS labels of incoming packets are trusted only when the IP phone is detected

16 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v Monitoring AutoQoS: Routers show auto qos [interface interface type] router> router>show auto qos interface Serial6/0 Serial6/0 – ! interface Serial6/0 service-policy output AutoQoS-Policy-UnTrust Displays the interface configurations, policy maps, class maps, and ACLs created on the basis of automatically generated configurations

17 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v Monitoring AutoQoS: Routers (Cont.) router>show policy-map interface FastEthernet0/0.1 FastEthernet0/0.1 Service-policy output: voice_traffic Class-map: dscp46 (match-any) 0 packets, 0 bytes 5 minute offered rate 0 bps, drop rate 0 bps Match: ip dscp 46 0 packets, 0 bytes 5 minute rate 0 bps Traffic Shaping TargetByte Sustain Excess Interval Increment Adapt Rate Limit bits/int bits/int (ms) (bytes) Active ……rest deleted show policy-map interface [interface type] router> Displays the packet statistics of all classes that are configured for all service policies either on the specified interface or subinterface

18 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v Monitoring AutoQoS: Switches show auto qos [interface interface-id] Switch# Switch#show auto qos Initial configuration applied by AutoQoS: wrr-queue bandwidth no wrr-queue cos-map wrr-queue cos wrr-queue cos wrr-queue cos 4 5 mls qos map cos-dscp ! interface FastEthernet0/3 mls qos trust device cisco-phone mls qos trust cos Displays the auto-QoS configuration that was initially applied Does not display any user changes to the configuration that might be in effect

19 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v Monitoring AutoQoS: Switches (Cont.) Switch#show mls qos interface gigabitethernet0/1 statistics Ingress dscp: incoming no_change classified policed dropped (in bytes) 1 : Others: Egress dscp: incoming no_change classified policed dropped (in bytes) 1 : 0n/a n/a 0 0 WRED drop counts: qid thresh1 thresh2 FreeQ 1 : : ………rest deleted show mls qos interface [interface-id | vlan vlan-id] [buffers | policers | queueing | statistics] [ | {begin | exclude | include} expression] Switch# Displays QoS information at the interface level

20 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v Monitoring AutoQoS: Switches (Cont.) show mls qos maps [cos-dscp | dscp-cos | dscp- mutation dscp-mutation-name | dscp-switch-priority | ip-prec-dscp | policed-dscp] [ | {begin | exclude | include} expression Switch# Switch#show mls qos maps dscp-cos Dscp-cos map: dscp: cos: Maps are used to generate an internal Differentiated Services Code Point (DSCP) value, which represents the priority of the traffic

21 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v Automation with Cisco AutoQoS: DiffServ Functions Automated

22 © 2005 Cisco Systems, Inc. All rights reserved. IPTX v Summary QoS can be enabled on a network by a single command per interface using AutoQoS. AutoQoS works on a variety of Cisco routers and switches. AutoQos automatically configures and enables the Diffserv mechanisms necessary for QoS.

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