netscaler/citrix server send gratuitous arp which is not recordnised by S8 Core Switch

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Our Customer is using a netscaler. Server (main&backup) is using same IP Address.

When there is an failover on server site, the server sends a gartuitous arp message.
The core switch (S8) does not recordnise this massage, so it too the default value of apr/mac timeout of 300sec the S8 will recordnise the MAC of the server which is now activ after failover.

is there any chance to get the gartuitous arp message tracked by the core without changing the arp/mac timeout?

many thanks!
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Nico Lueck

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Posted 1 year ago

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Bastian Sprotte, Employee

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hello,
did you test with enabled gratuitous-arp-learning.

 interface vlan.0.1010
  ip address 192.168.10.2 255.255.255.0 primary
  ip gratuitous-arp-learning both
  no shutdown
  exit


S8(su-config-intf-vlan.0.1010)->ip gratuitous-arp?
  gratuitous-arp                    Enable updating existing arp binding from gratuitous-arp
  gratuitous-arp-learning      Enable learning new arp binding from gratuitous-arp

regards
Bastian
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Nico Lueck

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Hi Bastian,

does that have an impact on traffic/cpu performance?

Thanks
Regards
Nico
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Bastian Sprotte, Employee

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no impact, just processing the gratuitous-arp packets and update the IP/MAC info as requested.
Bastian
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Nico Lueck

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Thanks a lot for your quick help here!