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Table Of Contents
Supported Standards, MIBs, and RFCs
Setting the Load Interval for a PVC
Setting the Load Interval for a PVC Example
Frame Relay MIB Enhancements
The Cisco Frame Relay MIB describes managed objects that let you monitor Frame Relay operations remotely by using Simple Network Management Protocol (SNMP). The Frame Relay MIB Enhancements feature extends the Cisco Frame Relay MIB by adding MIB objects that monitor the following Frame Relay functionality:
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Frame Relay fragmentation
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The Frame Relay MIB Enhancements feature also modifies the load-interval command to let you configure the load interval per permanent virtual circuit (PVC). The load interval is the length of time for which data is used to compute load statistics, including input rate in bits and packets per second, output rate in bits and packets per second, load, and reliability. Before the introduction of this feature, the load interval could be configured only for the interface.
History for the Frame Relay MIB Enhancements Feature
12.2(4)T
This feature was introduced.
12.2(28)SB
This feature was integrated into Cisco IOS Release 12.2(28)SB.
Finding Support Information for Platforms and Cisco IOS Software Images
Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.
Contents
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Feature Overview
Table 1 describes the MIB tables and objects that are introduced by the Frame Relay MIB Enhancements feature. For a complete description of the MIB, refer to the Cisco Frame Relay MIB file CISCO-FRAME-RELAY-MIB.my, which is available at http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml.
Related Documents
For information about configuring Frame Relay using Cisco IOS software, refer to the following documents:
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For information on configuring SNMP using Cisco IOS software, refer to the following documents:
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Supported Standards, MIBs, and RFCs
Standards
No new or modified standards are supported by this feature.
MIBs
This feature provides enhancements to the Cisco Frame Relay MIB. The MIB file, CISCO-FRAME-RELAY-MIB.my, can be downloaded at http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml.
RFCs
No new or modified RFCs are supported by this feature.
Prerequisites
Before you use the Frame Relay MIB, you must configure Frame Relay and SNMP on your devices.
To access the information introduced by the Frame Relay MIB enhancements, you must compile the Cisco Frame Relay MIB in the MIB file called CISCO-FRAME-RELAY-MIB.my into your network management system (NMS) application. You can download this file at http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml.
Configuration Tasks
See the following sections for configuration tasks for the Frame Relay MIB Enhancements feature. Each task in the list is identified as either required or optional.
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See the "Prerequisites" section earlier in this document for tasks that must be completed and functionality that must be configured before you can use the Cisco Frame Relay MIB.
Setting the Load Interval for a PVC
You can change the period of time over which a set of data is used for computing load statistics. Decisions, such as for dial backup, depend on these statistics. If you decrease the load interval, the average statistics are computed over a shorter period of time and are more responsive to bursts of traffic.
To change the length of time for which a set of data is used to compute load statistics for a PVC, use the following steps:
Verifying the Load Interval
Use the show running-config command to verify that you have configured the load interval correctly.
Configuration Examples
This section provides the following configuration example:
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Setting the Load Interval for a PVC Example
In the following example, the load interval is set to 60 seconds for a Frame Relay PVC with the DLCI 100:
interface serial 1/1
frame-relay interface-dlci 100
load-interval 60
Command Reference
This section documents the following modified command only.
load-interval
To change the length of time for which data is used to compute load statistics, use the load-interval command in interface configuration mode or Frame Relay DLCI configuration mode. To revert to the default setting, use the no form of this command.
load-interval seconds
no load-interval seconds
Syntax Description
seconds
Length of time for which data is used to compute load statistics. Value is a multiple of 30, from 30 to 600 (30, 60, 90, 120, and so on). The default is 300 seconds.
Command Default
The default load interval is 300 seconds.
Command Modes
Interface configuration
Frame Relay DLCI configurationCommand History
Usage Guidelines
To make computations more reactive to short bursts of traffic, you can shorten the length of time over which load averages are computed.
If the load interval is set to 30 seconds, new data is used for load calculations over a 30-second period. This data is used to compute load statistics, including the input rate in bits and packets per second, the output rate in bits and packets per second, the load, and reliability.
Load data is gathered every five seconds. This data is used for a weighted-average calculation in which recent load data has more weight in the computation than older load data. If the load interval is set to 30 seconds, the average is computed for the last 30 seconds of load data.
If you change the calculation interval from the default of five minutes to a shorter period of time, the input and output statistics that are displayed by the show interface command or the show frame-relay pvc command will be more current and will be based on more nearly instantaneous data, rather than reflecting the average load over a longer period of time.
This command is often used for dial backup purposes to increase or decrease the likelihood of implementation of a backup interface, but it can be used on any interface.
Examples
Interface Example
In the following example, the default average of five minutes is changed to a 30-second average. A burst in traffic that would not trigger a dial backup for an interface configured with the default five-minute interval might trigger a dial backup for this interface, which is set for the shorter 30-second interval.
Router(config)# interface serial 0Router(config-if)# load-interval 30Frame Relay PVC Example
In the following example, the load interval is set to 60 seconds for a Frame Relay PVC with the DLCI 100:
Router(config)# interface serial 1/1Router(config-if)# frame-relay interface-dlci 100Router(config-fr-dlci)# load-interval 60Related Commands
show interfaces
Displays statistics for all interfaces configured on the router or access server.
Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.
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