Context
How to set MTU which is in the network context for heartbeat.By default, MTU is zero which means it will get the value from the underlying network interface.
If MTU for all nodes are not the same, then it is best to set them to eliminate any potential issue.
Method
For asadm, this command will work:
asinfo -v "config-set:context=network;heartbeat.mtu=1460"
You can validate the settings by running this in asadm:
show stat like mtu -flip