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What Are the Aging Time and Aging Mechanism of ARP Entries?

The default aging time of ARP entries is 20 minutes. You can run the arp expire-time command to change the aging time.
 
You can also change the number of ARP probes by running the arp detect-times command. The default number of ARP probes is 3.
 
When the aging time of an ARP entry expires, the S2700/S3700/S5700/S6700 sends a probe packet to the corresponding IP address every 5 seconds. If the S2700/S3700/S5700/S6700 does not receive any response after the specified number of probes, it deletes the ARP entry.
 
For example, the aging time of ARP entries is set to 60s and the number of ARP probes is set to 6.
 
After 60s since an ARP entry is generated, the S2700/S3700/S5700/S6700 sends an ARP probe every 5s. If the S2700/S3700/S5700/S6700 does not receive any response after sending six probes, it deletes the ARP entry. Therefore, the actual aging time of the ARP entry is (60 + 6 x 5) = 90s.
 
NOTE
Currently, the S2700/S3700/S5700/S6700 supports the 1/2 probe time and 3/4 probe time. The numbers of probes on the two time points are both 3 and cannot be changed. For example, if the aging time is 20 minutes (1200s) and the number of ARP probes is 6, the SS2700/S3700/S5700/S6700 sends three ARP probes at an interval of 5s after 10 minutes. After 15 minutes, the S2700/S3700/S5700/S6700 also sends three ARP probes at an interval of 5s. After 20 minutes, the S2700/S3700/S5700/S6700 sends six ARP
probes at an interval of 5s. If the Huawei S2700 /Huawei S3700 /S5700/S6700 does not receive any response, it deletes the ARP entry.
 
 



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