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Table Of Contents
SNMP Support for VLAN Subinterfaces
Supported Standards, MIBs, and RFCs
Enabling the SNMP Agent on VLAN Subinterfaces
Enabling the SNMP Agent for VLAN Subinterfaces
SNMP Support for VLAN Subinterfaces
Feature History
This document describes the SNMP Support for VLAN Subinterfaces feature for Cisco IOS Release 12.1(7)E and 12.2(14)S and includes the following sections:
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Supported Standards, MIBs, and RFCs
Feature Overview
The SNMP Support for VLAN Subinterfaces feature provides MIB-2 interfaces sparse table support for Fast Ethernet subinterfaces. This enhancement is similar to the functionality supported in Frame Relay subinterfaces.
Benefits
Sparse table support for the interfaces table on Fast Ethernet subinterfaces provides customers accustomed to Frame Relay subinterfaces the same functionality.
Restrictions
Simple Network Management Protocol (SNMP) supports only Inter-Switch Link (ISL) VLAN encapsulations.
Related Documents
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Supported Platforms
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Determining Platform Support Through Cisco Feature Navigator
Cisco IOS software is packaged in feature sets that are supported on specific platforms. To get updated information regarding platform support for this feature, access Cisco Feature Navigator. Cisco Feature Navigator dynamically updates the list of supported platforms as new platform support is added for the feature.
Cisco Feature Navigator is a web-based tool that enables you to determine which Cisco IOS software images support a specific set of features and which features are supported in a specific Cisco IOS image. You can search by feature or release. Under the release section, you can compare releases side by side to display both the features unique to each software release and the features in common.
To access Cisco Feature Navigator, you must have an account on Cisco.com. If you have forgotten or lost your account information, send a blank e-mail to cco-locksmith@cisco.com. An automatic check will verify that your e-mail address is registered with Cisco.com. If the check is successful, account details with a new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com by following the directions found at this URL:
Cisco Feature Navigator is updated regularly when major Cisco IOS software releases and technology releases occur. For the most current information, go to the Cisco Feature Navigator home page at the following URL:
Availability of Cisco IOS Software Images
Platform support for particular Cisco IOS software releases is dependent on the availability of the software images for those platforms. Software images for some platforms may be deferred, delayed, or changed without prior notice. For updated information about platform support and availability of software images for each Cisco IOS software release, refer to the online release notes or, if supported, Cisco Feature Navigator.
Supported Standards, MIBs, and RFCs
Standards
None
MIBs
None
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:
http://tools.cisco.com/ITDIT/MIBS/servlet/index
If Cisco MIB Locator does not support the MIB information that you need, you can also obtain a list of supported MIBs and download MIBs from the Cisco MIBs page at the following URL:
http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml
To access Cisco MIB Locator, you must have an account on Cisco.com. If you have forgotten or lost your account information, send a blank e-mail to cco-locksmith@cisco.com. An automatic check will verify that your e-mail address is registered with Cisco.com. If the check is successful, account details with a new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com by following the directions found at this URL:
RFCs
RFC 1573, Evolution of the Interfaces Group of MIB-II
Configuration Tasks
See the following sections for configuration tasks for this feature. Each task is identified as either required or optional
To configure the SNMP Support for VLAN Subinterfaces feature, complete the tasks in the following section:
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Enabling the SNMP Agent on VLAN Subinterfaces
To enable the SNMP agent on VLAN subinterfaces, use the following commands in global configuration mode:
Verifying VLAN Subinterfaces
To display traffic count on subinterfaces, use the following command in privileged EXEC mode:
Configuration Examples
This section provides the following configuration example:
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Enabling the SNMP Agent for VLAN Subinterfaces
The following configuration example shows you how to enable the SNMP agent on the router with VLAN subinterfaces to monitor the SNMP application remotely:
Router(config)# snmp-server community public!interface FastEthernet4/0.100encapsulation isl 100ip address 192.168.10.21 255.255.255.0!interface FastEthernet4/0.200encapsulation isl 200ip address 172.21.200.11 255.255.255.0!interface FastEthernet4/1.1encapsulation isl 10ip address 172.16.0.0 255.255.255.0Command Reference
This section documents the modified show vlans command. All other commands used with this feature are documented in the Cisco IOS Release 12.2 T command reference publications.
show vlans
To display VLAN subinterfaces, use the show vlans command in privileged EXEC mode.
show vlans
Syntax Description
This command has no arguments or keywords.
Defaults
This command is not configured by default.
Command Modes
Privileged EXEC
Command History
Examples
The following is sample output from the show vlans command:
Router# show vlansVirtual LAN ID: 2 (IEEE 802.1Q Encapsulation)vLAN Trunk Interface: FastEthernet5/0.1Protocols Configured: Address: Received: Transmitted:IP 10.0.0.3 16 92129Virtual LAN ID: 3 (IEEE 802.1Q Encapsulation)vLAN Trunk Interface: Ethernet6/0/1.1Protocols Configured: Address: Received: Transmitted:IP 10.0.0.5 1558 1521Virtual LAN ID: 4 (Inter Switch Link Encapsulation)vLAN Trunk Interface: FastEthernet5/0.2Protocols Configured: Address: Received: Transmitted:IP 10.0.0.7 0 7Table 1 describes the significant fields shown in the display.
Related Commands
snmp-server community
Sets up the community access string to permit access to an SNMP group.