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The Delay of Pinging the Interface Address of a Remote Router Is Long While the Delay of Pinging the Interface Address o

Publication Date:  2013-01-07 Views:  34 Downloads:  0
Issue Description

Version: ME60 V100R005C02B01b

Networking: NE5000E----ME60----S9306

The delay is long when the ME60 pings the interface addresses of the NE5000E and S9306. However, the delay is normal and no jitter occurs when the NE5000E or S9306 pings the interface address of the ME60. The services attached to the ME60 are running properly.

Handling Process

The default mechanism for the ME60 to process the ICMP packets is that the CPU sends ICMP packets and the NP returns ICMP packets using ICMP reply fast. Therefore, when the ME60 pings a remote router, the CPU sends ICMP packets, causing a long delay and jitter. However, when a remote router pings the ME60, the NP responds rapidly. As a result, the delay of pinging is short and no jitter occurs.

To disable ICMP reply fast, run the undo icmp reply-fast command in the system view. After ICMP reply fast is disabled, the ME60 sends and receives ICMP packets based on CPU processing. The delay and jitter of pinging the ME60 increase.

Root Cause

The problem results from the implementation of the ME60.

Solution

If we need test the jitter of link, we can use NQA, check the NQA result.

Suggestions

Though the delay of ping is big, the service is well because it is forwarded by NP. 

END