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Why packet loss happens if the ping packet is shorter than 1500 bytes?

Created: Feb 27, 2020 08:07:09Latest reply: Feb 27, 2020 08:08:34 73 1 0 0
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Hello everyone,

I encountered a problem the MTU on the VLANIF interface is 1500 bytes. When a router pings a directly connected switch, why packet loss happens if the ping packet is shorter than 1500 bytes?

Does anyone know the reason? Thanks!


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jason_hu
Admin Created Feb 27, 2020 08:08:34 Helpful(0) Helpful(0)

Hi@ster,

A switch sends ping packets at an interval of 1 second, while the high-end router sends ping packets at a shorter interval. When a router sends a relatively long ping packet (for example, longer than 400 bytes), the number of bytes sent to the CPU every second exceeds the ICMP CAR value set on the switch. As a result, the ping packets are discarded by the switch. If you have any problems, please post them in our Community. We are happy to solve them for you!

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jason_hu
jason_hu Admin Created Feb 27, 2020 08:08:34 Helpful(0) Helpful(0)

Hi@ster,

A switch sends ping packets at an interval of 1 second, while the high-end router sends ping packets at a shorter interval. When a router sends a relatively long ping packet (for example, longer than 400 bytes), the number of bytes sent to the CPU every second exceeds the ICMP CAR value set on the switch. As a result, the ping packets are discarded by the switch. If you have any problems, please post them in our Community. We are happy to solve them for you!

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