Channel bonding configuration for slave interface

Hello.

I would like to ask question about the channel bonding configuration for slave interface.
I was pointed out the MAC address for the slave interface needs to be written in each
ifcfg-ethx files.

However, according to RHEL document for RHEL 6 and 7 do not have MAC address in it's example.

For RHEL 6
Example 10.2. Example ifcfg-ethX bonded interface configuration file
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/s2-networkscripts-interfaces-chan.html

For RHEL 7
Example 4.2. Example Slave Interface Configuration File
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Networking_Guide/sec-Network_Bonding_Using_the_Command_Line_Interface.html

Should I include the MAC address or is it just not necessary?

Best Regards,
Yu Watanabe