Shulou(Shulou.com)06/01 Report--

Starting with an address in vlan 1 of the switch, PC connects to the switch, sets an address of vlan 1 segment to PC, and then there will be a delay in the address of ping vlan 1 on PC. Originally, I did not consider this problem, but I always thought that it should be less than 1ms, but this is the case on the real machine.

First of all, why do we need "- t" ping 3750? Because in essence:

1. The switch is a forwarding device rather than a terminal device, and the business data will not enter the 3750 CPU.

2. If the destination of the ping packet (icmp) is 3750 local, the icmp package needs to go to 3750 CPU for processing and generate icmp reply to respond to icmp source.

Therefore, if there are no special needs, this delay can be ignored. Because ping 3750 is nothing more than a connectivity test, not a forwarding performance test. (forwarding performance testing needs to be tested in other ways)

Moreover, from the results, the average delay is only 2ms, in fact, the delay is not very high.

Anyway,

1. If the destination of the icmp packet is a switch, it must be handled by CPU and corresponding, so the delay must be related to cpu utilization. If it is a packet loss, it will also be related to CoPP.

2. The test itself does not have any real meaning.

The echo of icmp is a low-priority packet, and the system needs to respond to ping after dealing with high-priority processes and traffic. in addition, as the upstairs expert said, there is a difference between traversal data forwarding and ping switch itself, and the result is meaningless.

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