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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 Information in This Module
Your Cisco IOS software release may not support all of the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To reach links to specific feature documentation in this module and to see a list of the releases in which each feature is supported, use the "Feature Information for Enabling Protocol Discovery" section.
Finding Support Information for Platforms and Cisco IOS and Catalyst OS Software Images
Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
•Prerequisites for Enabling Protocol Discovery
•Information About Protocol Discovery
•How to Configure Protocol Discovery
•Configuration Examples for Enabling Protocol Discovery
•Feature Information for Enabling Protocol Discovery
Before enabling Protocol Discovery, read the information in the "Classifying Network Traffic Using NBAR" module.
Before enabling Protocol Discovery, you should understand the following concept:
•Protocol Discovery Functionality
NBAR 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:
•Total number of input packets and bytes
•Total number of output packets and bytes
•Input bit rates
•Output bit rates
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.
•Enabling Protocol Discovery on an Interface (required)
•Reporting Protocol Discovery Statistics (optional)
The ip nbar protocol-discovery command 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.
1. enable
2. configure terminal
3. interface type number [name-tag]
4. ip nbar protocol-discovery
5. end
To display a report of the Protocol Discovery statistics per interface, perform the following steps.
1. enable
2. show policy-map interface type number
3. show ip nbar protocol-discovery [interface type number] [stats {byte-count | bit-rate | packet-count | max-bit-rate}] [protocol protocol-name | top-n number]
4. exit
This section provides the following configuration examples:
•Example: Enabling Protocol Discovery on an Interface
•Example: Reporting Protocol Discovery Statistics
In the following sample configuration, Protocol Discovery is enabled on Ethernet interface 2/4.
Router> enable
Router# configure terminal
Router(config)# interface ethernet 2/4
Router(config-if)# ip nbar protocol-discovery
Router(config-if)# end
The following example displays output from the show ip nbar protocol-discovery command 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
After 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.
The following sections provide references related to enabling Protocol Discovery.
|
|
---|---|
QoS commands: complete command syntax, command modes, command history, defaults, usage guidelines, and examples |
|
Concepts and information about NBAR |
|
Configuring NBAR using the MQC |
|
Adding application recognition modules (also known as PDLMs) |
|
Creating a custom protocol |
"Creating a Custom Protocol" module |
Table 1 lists the release history for this feature.
For information on a feature in this technology that is not documented here, see the "Classifying Network Traffic Using NBAR Features Roadmap" module.
Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Note Table 1 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.