The common problems of Ping on huawei switches

1 When Ping is broken, what are the possible reasons

(1) may be due to network delay is large. You can use the ping command to "-t" option to increase response timeout;

(2) may be the high utilization rate of equipment CPU cause, OSN1500B can master view by display cpu-usage or display cpu-usage slot slot-id or the single board CPU utilization. If a taskname CPU utilization rate is too high, please check whether the module problems.

(3) if the device down link the two layer network, may be the existence of MAC drift problem in two layer network.

2 With the "-f" parameter Ping commands, why not Ping bag

The ping command with the "-f" parameter, the specified message cannot be set fragment flag.Ping bag, if more than the interface of the MTU value, it is need to be sliced, so contradictory,packets discarded directly, do not send.

3 Ping single pass phenomenon, what are the possible reasons

If it is on the Ping equipment and the terminal equipment of Ping terminal, Ping terminalequipment can pass through the barrier, Ping, may be the terminal open firewall protection.

The device Ping to end Ping barrier, from end-to-end Ping over to Ping, may be a deviceenabled fast ping function. Execute the command: undo icmp-reply fast, closed fast back to the ping function and Ping test.

4 Regularity of packet loss occurred in Ping bag, what is the reason?

(1) Regularity of packet loss occurred in Ping large, continuous through several packets lost a bag, this is usually the message rate exceeds the cpcar value, be directly discarded. The following command, if Drop fields exist count showed that car value is too small, need to adjust the cpcar value and test. Adjust the command: [Quidway]cpu-defend policy test Cpcar[Quidway-cpu-defend-policy-test]car packet-type ICMP CIR 64 / / configuration anti attackstrategy of test message CAR action rules, set the message type is ICMP, the committed information rate is 64kbit/s

(2) from the friends of business equipment Ping cassette switch when broken, what is the reason

From the friends of business equipment Ping s series switches, often through several packet after long time no, about two minutes and Ping, then through several message after a long timeout. This is because the switch default enables the Ping inhibition function results, when the number of ICMP packets per second received port exceeds a certain threshold, the port to the ICMP message will inhibit two minutes, an ICMP message is received no treatment.

The rate is relatively fast friends of business equipment in normal Ping, OSN2500 exceeded the threshold.

Ping operation with the "-m" parameter, the sending rate soon will also appear the problem.

Execute the command undo ICMP rate-limit enable to close the inhibition function, can solve this problem. Inhibition of ICMP function enable will not affect the business application, only affect the operation of the ping.