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ping packet loss regularly

Created: Oct 12, 2019 03:09:44Latest reply: Oct 14, 2019 02:10:01 346 2 0 0
  Rewarded HiCoins: 0 (problem resolved)

Hi all,

 We installed a new S5700. When a link test is performed on site, the ping packet loss occurs regularly. A packet is lost every ten packets. and the situation does not change after changing the port and fiber. What is the possible cause?


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Popeye_Wang
Admin Created Oct 12, 2019 03:12:54 Helpful(1) Helpful(1)

Hi Sprout,

Packet loss occurs regularly during the ping operation. This is usually caused by the ping protection mechanism of the switch. Because the packet rate exceeds the cpcar value, the packet is discarded.


You can run the display cpu-defend statistics all command to view ICMP packet statistics. If the Drop column of the ICMP packet type contains statistics, the CAR value is too small. In this case, you can adjust the cpcar value and then perform the test again.


The following is an example of adjusting the cpcar value:


 # Configure the CAR action rule for the attack defense policy named test. Set the packet type to ICMP and the committed information rate to 64 kbit/s.


<HUAWEI> system-view


[HUAWEI] cpu-defend policy test


[HUAWEI-cpu-defend-policy-test] car packet-type icmp cir 64


[HUAWEI] cpu-defend-policy test global



If the packet loss is caused by the protection mechanism when the link is tested, you do not need to modify it.


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Popeye_Wang
Popeye_Wang Admin Created Oct 12, 2019 03:12:54 Helpful(1) Helpful(1)

Hi Sprout,

Packet loss occurs regularly during the ping operation. This is usually caused by the ping protection mechanism of the switch. Because the packet rate exceeds the cpcar value, the packet is discarded.


You can run the display cpu-defend statistics all command to view ICMP packet statistics. If the Drop column of the ICMP packet type contains statistics, the CAR value is too small. In this case, you can adjust the cpcar value and then perform the test again.


The following is an example of adjusting the cpcar value:


 # Configure the CAR action rule for the attack defense policy named test. Set the packet type to ICMP and the committed information rate to 64 kbit/s.


<HUAWEI> system-view


[HUAWEI] cpu-defend policy test


[HUAWEI-cpu-defend-policy-test] car packet-type icmp cir 64


[HUAWEI] cpu-defend-policy test global



If the packet loss is caused by the protection mechanism when the link is tested, you do not need to modify it.


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chenhui
chenhui Admin Created Oct 14, 2019 02:10:01 Helpful(0) Helpful(0)

as Popeye said, the ICMP packets may be discarded for exceeding the threshold of CPU defend.
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