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Changing the network ports used for replication

Port numbers used by VVR

VVR uses the UDP and TCP transport protocols to communicate between the Primary and Secondary. This section lists the default ports used by VVR. VVR uses the following ports by default when replicating data using UDP:

VVR uses the following ports by default when replicating data using TCP.

Displaying and changing the ports used by VVR

Use the vrport(1M) command to display, change or set the port numbers used by VVR. You may have to change the port numbers in the following cases:

  To resolve a port number conflict with other applications.

  To configure VVR to work in your firewall environment.

  To configure VVR to work in your firewall environment when using UDP; to specify a restricted number of ports to replicate data between the Primary and the Secondary.

Port used for heartbeats

Use the vrport heartbeat command to display the port number used by VVR, for heartbeats. To change the heartbeat port number on a host, specify the port number with the vrport heartbeat command. Use the vradmin changeip command to update the RLINKs with the new port information, and then restart the vxnetd daemon on the required system for the changes to take effect.

 To display the port number used for heartbeats

# vrport heartbeat

 To change the port number used for heartbeats

# vrport heartbeat port

Example

 To change the replication heartbeat port on seattle from 4145 to 5000

1. Use the vrport command to change the heartbeat port to 5000 on the required host.

   # vrport heartbeat 5000

2. Issue the vradmin changeip command without the newpri and newsec attributes.

   # vradmin -g hrdg changeip hr_rvg london

3. Verify the changes to the local RLINK by issuing the following command on the required host:

   # vxprint -g hrdg -l rlk_london_hr_rvg

4. Stop the vxnetd daemon.

   # /usr/sbin/vxnetd stop

5. Restart the vxnetd daemon.

   # /usr/sbin/vxnetd

Follow the same steps to change the heartbeat port on secondary (london).

  Note   VVR supports a configuration with different heartbeat port numbers on the primary and secondary.

Port used by vradmind

To display the port number used by vradmind, use the vrport vradmind command. To change the vradmind port, specify the port number with the vrport vradmind command.

 To display the port number used by vradmind

# vrport vradmind

 To change the port number used by vradmind

# vrport vradmind port

  Note   You must restart the server vradmind for this change to take effect. Make sure you change the port number on all the hosts in the RDS.

Port used by in.vxrsyncd

To display the port numbers used by in.vxrsyncd, use the vrport vxrsyncd command. To change the port numbers used by in.vxrsyncd, specify the port number with the vrport vxrsyncd command.

 To display the port number used by in.vxrsyncd

# vrport vxrsyncd

 To change the port number used by in.vxrsyncd

# vrport vxrsyncd port

  Note   You must restart the server in.vxrsyncd for this change to take effect. Make sure you change the port number on all the hosts in the RDS.

Ports used to replicate data using UDP

To display the ports used to replicate data when using UDP, use the vrport data command. To change the ports used to replicate data when using UDP, specify the list of port numbers to use with the vrport data command.

Each RLINK requires one UDP port for replication. Specify an unused, reserved port number that is less than 32768 so that there is no port conflict with other applications. The number of ports specified must be equal to or greater than the number of RLINKs on the system.

  Note   For systems using the TCP protocol for replication, you are not required to select any data port as the connection is established with the listener port on the remote host. The listener uses this port number which is numerically same as the UDP port used for heartbeat messages.

 To display ports used to replicate data when using UDP

# vrport data

 To change ports used to replicate data when using UDP

For a system configured with one RLINK, use the following command:

# vrport data port

For a system configured with multiple RLINKs, you can specify either a range of port numbers or a list of port numbers or both.

To specify a range of port numbers, use the following command:

# vrport data port1, port2, portlow-porthigh, .....

For example:

# vrport data 3400, 3405, 3500-3503, 5756-5760

  Note   To use the new port information, execute /usr/sbin/vxnetd, and then pause and resume all RLINKs.