Cisco 10005 Installationsanleitung PDF herunterladen (Seite 36)

Cisco 10000 Series Router Performance Routing Engine Installation

OL-3971-03

Analyzing and Troubleshooting Packets

The following are examples of packets that can cause feedbacks to occur:

• Packets that are forwarded and logged to the console

• ICMP packets that are sent

• Packets that require both input and output quality of service (QoS)

The feedback counter reflects the total number of feedbacks through the PXF by all packets. The counter

increments one time for each additional pass a packet makes.

When a packet is denied because of an ACL deny statement, the router drops the packet. Dropped

packets do not need further processing and, therefore, are not fed back through the PXF. In this case, the

feedback counter does not increment.

Displaying Packet Statistics

The Cisco 10000 router supports show pxf cpu commands that allow you to do such things as determine

the:

• Forwarding engine traffic load

• Traffic types handled by the forwarding engine

• Forwarding engine actions on the traffic

• Traffic load from the PXF to the route processor (RP)

• Status of output packet buffers for the queuing system

The show pxf cpu commands used to display packet statistics differ between the ESR-PRE/ESR-PRE1

and the ESR-PRE2. For the ESR-PRE or ESR-PRE1, the commands are show hardware pxf cpu; for

the ESR-PRE2, the commands are show pxf cpu.

To display packet statistics for the ESR-PRE2, enter any of the following commands:

Command Purpose

Router# show running-config

Displays the current router configuration.

Router# show version

Displays information about the currently loaded

software version along with hardware and device

information.

Router# show pxf cpu statistics security

Displays information about packets denied and

permitted by a specific ACL, and packets denied or

permitted and logged.

Router# show pxf cpu drop

Displays drop statistics for the forwarding processor,

including packets counts for the ICMP created

counters.

Router# show pxf cpu context

Displays forwarding processor context statistics,

including feedback counts from the feedback counter.

Router# show pxf cpu statistics ip

Displays forwarding IP statistics, including forwarded

counts from the IP forwarding counter.

Router# show interfaces

type

slot

module

port

Displays information about an interface.

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