validate-multicast

Validates that multicast transport is available for clusters.

Synopsis

asadmin [asadmin-options] validate-multicast [--help]
[--multicastport multicastport]
[--multicastaddress multicastaddress]
[--bindaddress bindaddress]
[--sendperiod sendperiod]
[--timeout timeout]
[--timetolive timetolive]
[--verbose={false|true}]

Description

The validate-multicast subcommand validates that multicast transport is available for clusters. You should run this subcommand at the same time on each of the hosts to be validated. This subcommand is available in local mode.

Do not run the validate-multicast subcommand using the DAS and cluster’s multicast address and port values while the DAS and cluster are running. Doing so results in an error.
The validate-multicast subcommand must be run at the same time on two or more machines to validate whether multicast messages are being received between the machines.

As long as all machines see each other, multicast is validated to be working properly across the machines. If the machines are not seeing each other, set the --bindaddress option explicitly to ensure that all machines are using interface on same subnet, or increase the --timetolive option from the default of 4. If these changes fail to resolve the multicast issues, ask the network administrator to verify that the network is configured so the multicast messages can be seen between all the machines used to run the cluster.

Options

asadmin-options: Options for the asadmin utility. For information about these options, see the asadmin help page.
--help
-?: Displays the help text for the subcommand.
--multicastport: The port for the multicast socket on which the Group Management Service (GMS) listens for group events. Specify a standard UDP port number in the range 2048-49151. The default is 2048.
--multicastaddress: The address for the multicast socket on which the GMS listens for group events. Specify a class D IP address. Class D IP addresses are in the range 224.0.0.0 to 239.255.255.255, inclusive. The address 224.0.0.0 is reserved and should not be used. The default is 228.9.3.1.
--bindaddress: The local interface to receive multicast datagram packets for the GMS. The default is to use all available binding interfaces.
On a multi-home machine (possessing two or more network interfaces), this attribute enables you to indicate which network interface is used for the GMS. This value must be a local network interface IP address.
--sendperiod: The number of milliseconds between test messages sent between nodes. The default is 2000.
--timeout: The number of seconds before the subcommand times out and exits. The default is 20. You can also exit this subcommand using Ctrl-C.
--timetolive: The default time-to-live for multicast packets sent out on the multicast socket in order to control the scope of the multicasts. The time-to-live value must be between zero and 255 inclusive. The default is the JDK default or a minimum defined by a constant in the GMS subsystem, whichever is lower. To see the time-to-live value being used, use the --verbose option.
--verbose: If used without a value or set to true, provides additional debugging information. The default is false.

Examples

Example 1 Validating multicast transport

Run from host machine1:

asadmin> validate-multicast
Will use port 2,048
Will use address 228.9.3.1
Will use bind address null
Will use wait period 2,000 (in milliseconds)

Listening for data...
Sending message with content "machine1" every 2,000 milliseconds
Received data from machine1 (loopback)
Received data from machine2
Exiting after 20 seconds. To change this timeout, use the --timeout command line option.
Command validate-multicast executed successfully

Run from host machine2:

asadmin> validate-multicast
Will use port 2,048
Will use address 228.9.3.1
Will use bind address null
Will use wait period 2,000 (in milliseconds)

Listening for data...
Sending message with content "machine2" every 2,000 milliseconds
Received data from machine2 (loopback)
Received data from machine1
Exiting after 20 seconds. To change this timeout, use the --timeout command line option.
Command validate-multicast executed successfully

Exit Status

0: command executed successfully
1: error in executing the command

See Also