Step 1: Check CPU Utilization

Purpose

The enterprise-specific chassis MIB provides information about the router and its components. Within the chassis MIB, the jnxMIBs branch contains one main subbranch, jnxBoxAnatomy, which in turn contains a section, jnxOperatingTable. Within jnxOperatingTable, and under the jnxOperatingEntry, you can use the jnxOperatingCPU object to monitor the CPU on your router. (See Figure 20.)

Figure 20: Chassis MIB Tree

After each object description is a value in parenthesis, such as (1). This value can be used to enter an OID for the specific object. For example, to gather information on the CPU, you can type the object description (jnxOperatingCPU) or the OID (.1.3.6.1.4.1.2636.3.1.13.1.8).

Action

To check CPU utilization using the Juniper enterprise chassis MIB, from a management station that has access to the router, and using a tool such as Snmpwalk, enter the following command:

user-bsd# snmpwalk [common arguments] hostname community object-id

Sample Output

user-nms % snmpwalk -Os -M /volume/~/mibs -m all tp1 public jnxOperatingCPU

jnxOperatingCPU.1.1.1.0 = Gauge32: 0

jnxOperatingCPU.1.1.2.0 = Gauge32: 0

jnxOperatingCPU.1.1.3.0 = Gauge32: 0

jnxOperatingCPU.2.1.0.0 = Gauge32: 0

jnxOperatingCPU.4.1.1.0 = Gauge32: 0

jnxOperatingCPU.4.1.2.0 = Gauge32: 0

jnxOperatingCPU.4.1.3.0 = Gauge32: 0

jnxOperatingCPU.4.1.4.0 = Gauge32: 0

jnxOperatingCPU.6.1.1.0 = Gauge32: 224

jnxOperatingCPU.6.1.2.0 = Gauge32: 224

jnxOperatingCPU.7.1.0.0 = Gauge32: 2

jnxOperatingCPU.7.2.0.0 = Gauge32: 2

jnxOperatingCPU.8.1.1.0 = Gauge32: 0

jnxOperatingCPU.8.2.3.0 = Gauge32: 0

jnxOperatingCPU.8.2.4.0 = Gauge32: 0

jnxOperatingCPU.9.1.0.0 = Gauge32: 6

jnxOperatingCPU.9.1.1.0 = Gauge32: 0

user-nms % snmpwalk -Os -M /volume/~/mibs -m all tp1 public jnxOperatingDesc

jnxOperatingDescr.1.1.1.0 = midplane

jnxOperatingDescr.1.1.2.0 = midplane

jnxOperatingDescr.1.1.3.0 = midplane

jnxOperatingDescr.2.1.0.0 = Power Supply A

jnxOperatingDescr.4.1.1.0 = Left Tray front fan

jnxOperatingDescr.4.1.2.0 = Left Tray second fan

jnxOperatingDescr.4.1.3.0 = Left Tray third fan

jnxOperatingDescr.4.1.4.0 = Left Tray fourth fan

jnxOperatingDescr.6.1.1.0 = CFEB Internet Processor IIv1

jnxOperatingDescr.6.1.2.0 = CFEB Internet Processor IIv1

jnxOperatingDescr.7.1.0.0 = FPC @ 0/*/*

jnxOperatingDescr.7.2.0.0 = FPC @ 1/*/*

jnxOperatingDescr.8.1.1.0 = PIC: 4x OC-3 SONET, MM @ 0/0/*

jnxOperatingDescr.8.2.3.0 = PIC: 1x Tunnel @ 1/2/*

jnxOperatingDescr.8.2.4.0 = PIC: 1x G/E, 1000 BASE-SX @ 1/3/*

jnxOperatingDescr.9.1.0.0 = Routing Engine

jnxOperatingDescr.9.1.1.0 = Routing Engine PCMCIA Card

What It Means

The sample output shows the percentage CPU utilization on router, tp1. The Routing Engine (9.1.0.0) has 6 percent CPU utilization, the two CFEB Internet Processors IIv1 (6.1.1.0 and 6.1.2.0) have 22 percent each, and the FPCs (7.1.0.0 and 7.2.0.0) have 2 percent each. Components with a value of zero indicate that the information is either unavailable or inapplicable.

The output for the jnxOperatingDesc object provides a description of the separate instances in the jnxOperatingCPU object. For example, 9.1.0.0 represents the Routing Engine.