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[JSA/STRM] What ports are used for HA communication?

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Article ID: KB17466 KB Last Updated: 05 Oct 2019Version: 4.0
Summary:

JSA can be set up in a high availability (HA) environment (active-standby) since version 2009.2.

Symptoms:

What ports need to be opened on devices between the HA members in order for communication to occur?

Cause:

The appropriate ports may not be open between HA members.

Solution:

Between the primary and the secondary HA members, the following ports (bidirectional) need to be open:

  • ICMP between two hosts
  • TCP port 22 for ssh
  • UDP port 6543 for the heartbeat in versions 2013.2 and earlier
  • UDP port 10101 and 10102 for the heartbeat in versions 2014 and later
  • TCP port 7789 for drbd (data replication)

If these ports are not open, JSA cannot be set up in an HA environment.

Modification History:
2019-10-05: Minor, non-technical updates.
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