CHAPTER 13

13.Fault Analysis and Solution

13.1.Problem Location & Information Collection

In usual cases, the system should be timely checked for problem location and solution when it is abnormal.And the information should be collected for relevant personnel for further analysis and solution or serving as the reference documents for the system maintenance.

13.1.1.General Check

Step 1 Record the result information of the following information: show version [all<0-15>]: Show the version information of all/part of boards or cards inserted in 3P@C 4450E

show running-time: Show the running time of the system

show running-config: Show the running configuration of the system

show task: Check whether the task is normally run

show slab mod: Check the allocation and use of memory

show slab global: Check the use of memory

Show sysattack: Check the cases of the system being attacked

13.1.2.Layer-2 Check

If some ports on a network segment are blocked, check Layer 2 first:

Step

show port {[all<portlist>]}*1

Check the status of ports, the up/down

1

 

status of ports and the rate, duplex, flow

 

 

control and auto-negotiation mode of

 

 

ports.

Step

show fdb

View the software FDB table, and whether

2

 

the MAC address of subscribers and the

 

 

MAC address of the peer router have been

 

 

learnt, and the ports and Vlan Name are

 

 

correct

Step

show vlan

Check whether the VLAN configuration of

3

 

software is correct, especially the

 

 

correctness of the VLAN configuration with

 

 

the upstream equipment, including

 

 

whether the connection port is correctly

 

 

added and the tag value is correctly

 

 

configured.

3P@C Installation Manual

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