Got it

Long ARP timeout

Created: Mar 13, 2020 05:59:26Latest reply: Mar 13, 2020 06:12:55 118 3 0 0
  Rewarded HiCoins: 0 (problem resolved)

Hi all,

The customer has a S7706 connected to several servers. The virtual machines are moved between the servers.

Now the problem is that the ARP entries are not updated when a VM with a fixed IP  is moved from one server to another one, but the MAC address in the MAC address table is updated immediately

For example:

Sever1---eth-trunk1---S5720---eth-trunk2---Server2

When the VM moves from server1 to server2, the MAC address is immediately moved to eth-trunk2. However, the ARP entry still corresponds to Eth-Trunk 1, and it changes to Eth-Trunk 2 after about 30s.

Can you solve this annoying issue for me, please?

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Admin Created Mar 13, 2020 06:07:10 Helpful(1) Helpful(1)

Hi Hobbit,

The outbound interface in a MAC address entry is updated by packets, whereas the outbound interface in an ARP entry is updated after the aging time is reached. In this case, the outbound interfaces in the MAC address entry and ARP entry may be different. To address this issue, run the mac-address update arp command to enable the Switch to update outbound interfaces in ARP entries when outbound interfaces in MAC address entries change.

Please let us know the results after making this configuration change.


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Popeye_Wang Admin Created Mar 13, 2020 06:07:10 Helpful(1) Helpful(1)

Hi Hobbit,

The outbound interface in a MAC address entry is updated by packets, whereas the outbound interface in an ARP entry is updated after the aging time is reached. In this case, the outbound interfaces in the MAC address entry and ARP entry may be different. To address this issue, run the mac-address update arp command to enable the Switch to update outbound interfaces in ARP entries when outbound interfaces in MAC address entries change.

Please let us know the results after making this configuration change.


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Hobbit Created Mar 13, 2020 06:12:18 Helpful(0) Helpful(0)

Posted by Popeye_Wang at 2020-03-13 06:07 Hi Hobbit,The outbound interface in a MAC address entry is updated by packets, whereas the outbound ...
Can you please tell me is it this may in any way affect the stability of the device or the services running on it?
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Popeye_Wang Admin Created Mar 13, 2020 06:12:55 Helpful(0) Helpful(0)

Posted by Hobbit at 2020-03-13 06:12 Can you please tell me is it this may in any way affect the stability of the device or the service ...
There should be no impact in using the command we recommended, it will just help update the arp entry faster.
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