Enabling Protocol Discovery
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Contents
Enabling Protocol DiscoveryLast Updated: November 8, 2012
Network-Based Application Recognition (NBAR) includes a feature called Protocol Discovery. Protocol Discovery provides an easy way to discover the application protocols that are operating on an interface. When you configure NBAR, the first task is to enable Protocol Discovery. This module contains concepts and tasks for enabling the Protocol Discovery feature. Finding Feature InformationYour software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module. Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required. Prerequisites for Enabling Protocol DiscoveryBefore enabling Protocol Discovery, read the information in the "Classifying Network Traffic Using NBAR" module. Information About Protocol DiscoveryProtocol Discovery FunctionalityNBAR determines which protocols and applications are currently running on your network. NBAR includes a feature called Protocol Discovery. Protocol Discovery provides an easy way of discovering the application protocols that are operating on an interface so that appropriate quality of service (QoS) features can be applied. With Protocol Discovery, you can discover any protocol traffic that is supported by NBAR and obtain statistics that are associated with that protocol. Protocol Discovery maintains the following per-protocol statistics for enabled interfaces:
The statistics can then be used when you later define classes and traffic policies (sometimes known as policy maps) for each traffic class. The traffic policies (policy maps) are used to apply specific QoS features and functionality to the traffic classes. How to Configure Protocol DiscoveryEnabling Protocol Discovery on an InterfaceThe ip nbar protocol-discoverycommand is used to enable Protocol Discovery on an interface. With Cisco IOS Release 12.2(18)ZYA, intended for use on the Cisco 6500 series switch that is equipped with a Supervisor 32/PISA, the ip nbar protocol-discovery command is supported on both Layer 2 and Layer 3 Etherchannels. To enable Protocol Discovery on an interface, perform the following steps. DETAILED STEPS Reporting Protocol Discovery StatisticsTo display a report of the Protocol Discovery statistics per interface, perform the following steps. DETAILED STEPS Configuration Examples for Enabling Protocol DiscoveryExample Reporting Protocol Discovery StatisticsThe following example displays output from the show ip nbar protocol-discoverycommand for the five most active protocols on an Ethernet interface:
Router# show ip nbar protocol-discovery top-n 5
Ethernet2/0
Input Output
----- ------
Protocol Packet Count Packet Count
Byte Count Byte Count
30sec Bit Rate (bps) 30sec Bit Rate (bps)
30sec Max Bit Rate (bps) 30sec Max Bit Rate (bps)
--------------------------- ------------------------ ------------------------
rtp 3272685 3272685
242050604 242050604
768000 768000
2002000 2002000
gnutella 513574 513574
118779716 118779716
383000 383000
987000 987000
ftp 482183 482183
37606237 37606237
121000 121000
312000 312000
http 144709 144709
32351383 32351383
105000 105000
269000 269000
netbios 96606 96606
10627650 10627650
36000 36000
88000 88000
unknown 1724428 1724428
534038683 534038683
2754000 2754000
4405000 4405000
Total 6298724 6298724
989303872 989303872
4213000 4213000
8177000 8177000
Where to Go NextAfter you enable Protocol Discovery, you have the option to configure NBAR using the Modular Quality of Service (QoS) Command-Line Interface (CLI) (MQC). To configure NBAR using the MQC, see the "Configuring NBAR Using the MQC" module. Additional ReferencesRelated Documents
Technical Assistance
Feature Information for Enabling Protocol DiscoveryThe following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature. Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: www.cisco.com/go/trademarks. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1110R) Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental. © 2012 Cisco Systems, Inc. All rights reserved.
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