Document ID: 13500
Contents
Introduction
Before You Begin
Conventions
Prerequisites
Components Used
frCircuitSentOctets and frCircuitReceivedOctets from RFC 1315 MIB
ifInOctets and IfOutOctets from RFC 2233
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Related Information
Introduction
Tracking Frame Relay data-link connection identifier (DLCI) utilization is similar to tracking the utilization of other types of interfaces in that you track traffic transmitted and received by an interface and compare it with maximum amount possible. However, unlike other interfaces, other factors affect the throughput for a particular Frame Relay circuit. For example, committed information rate (CIR), burst rate, and service provider network congestion can affect your ability to accurately calculate utilization.
This document provides two different methods for calculating Frame Relay circuit utilization:
-
Using the frCircuitSentOctets and frCircuitReceivedOctets from RFC 1315 MIB. This method measures the in and out octets for each circuit (DLCI). As long as you are not using compression over the circuit, the counters are accurate.
-
Using the ifInOctets and ifOutOctets from RFC 2233
for each Frame Relay sub-interface.
Please refer to How To Calculate Bandwidth Utilization Using SNMP for the formulas to use. As an estimate of a maximum throughput of the Frame Relay circuit, you can use the ifSpeed of the interface, or, if you have Frame Relay Traffic Policing in place, (Bc+Be)/Tc.
Before You Begin
Conventions
For more information on document conventions, see the Cisco Technical Tips Conventions.
Prerequisites
There are no specific prerequisites for this document.
Components Used
The information in this document applies to all devices that support RFC 1315 MIB and RFC 2233.
frCircuitSentOctets and frCircuitReceivedOctets from RFC 1315 MIB
.1.3.6.1.2.1.10.32.2.1.7
frCircuitSentOctets OBJECT-TYPE
-- FROM RFC1315-MIB
SYNTAX Counter
MAX-ACCESS read-only
STATUS Mandatory
DESCRIPTION "The number of octets sent from this virtual circuit
since it was created."
::= { iso(1) org(3) dod(6) internet(1) mgmt(2) mib-2(1) transmission(10) frame-relay(32)
frCircuitTable(2) frCircuitEntry(1) 7 }
.1.3.6.1.2.1.10.32.2.1.9
frCircuitReceivedOctets OBJECT-TYPE
-- FROM RFC1315-MIB
SYNTAX Counter
MAX-ACCESS read-only
STATUS Mandatory
DESCRIPTION "Number of octets received over this virtual circuit
since it was created."
::= { ISO(1) org(3) DOD(6) Internet(1) mgmt(2) mib-2(1) transmission(10) frame-relay(32)
frCircuitTable(2) frCircuitEntry(1) 9 }
ifInOctets and IfOutOctets from RFC 2233
The advantage of this method is that these counters take into consideration the compressed data statistics rather than the uncompressed.
.1.3.6.1.2.1.2.2.1.10
ifInOctets OBJECT-TYPE
-- FROM RFC1213-MIB
SYNTAX Counter
MAX-ACCESS read-only
STATUS Current
DESCRIPTION "The total number of octets received on the interface, including
framing characters. Discontinuities in the value of this counter
can occur at re-initialization of the management system, and at other
times as indicated by the value of ifCounterDiscontinuityTime."
::= { ISO(1) org(3) DOD(6) Internet(1) mgmt(2) mib-2(1) interfaces(2) ifTable(2) ifEntry(1) 10 }
.1.3.6.1.2.1.2.2.1.16
ifOutOctets OBJECT-TYPE
-- FROM RFC1213-MIB
SYNTAX Counter
MAX-ACCESS read-only
STATUS Current
DESCRIPTION "The total number of octets transmitted out of the interface, including
framing characters. Discontinuities in the value of this counter can
occur at re-initialization of the management system, and at other
times as indicated by the value of ifCounterDiscontinuityTime."
::= { ISO(1) org(3) DOD(6) Internet(1) mgmt(2) mib-2(1) interfaces(2) ifTable(2) ifEntry(1) 16 }
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Related Information
- Frame Relay Traffic Policing
- How To Calculate Bandwidth Utilization Using SNMP
- Technical Support - Cisco Systems
| Updated: Oct 26, 2005 | Document ID: 13500 |