VMs need to support giant frames, how do I set it up?

Cloud hosts need to support giant frames, how do I set it up?

Cloud Platform Environment: ZStack Enterprise Version 4.1.3

Network Environment: Flat Network

Storage environment: Ceph storage

Management Node Operating System: ZStack Customized CentOS 7.6 System

Cloud Host System: CentOS 7.6 System

Users need to receive giant frames, butThe MTU value of cloud platform three-tier network and physical network card is 1500 by default, which needs to be modified to 9000.

Be careful: Users need to configure the switch side to turn on support giant frames.

1.     Firstly, modify the configuration file corresponding to the bond used by the Layer 2 network in the physical machine, and set the MTU value in ifcfg-bond0 to 9000.
 

 #   Vim / Etc/sysconfig/network-scripts/ifcfg-bond0

(Figure 1 enters the two-tier bond corresponding profile)

(Figure 2 modifies the corresponding profile MTU)

2.     Restart the network service on the physical machine to take effect (Be careful: Restarting the physical machine network service may cause business exceptions. Please make sure that no cloud hosts are running on the physical machine and that Ceph is stored in a healthy state. If in doubt, please contact ZStack's official technical support)

#   Service  Network   Restart

(Figure 3 Physical Machine Restart Network Service)

3.     Modify the MTU value of 9000 in the cloud platform global settings, and the new policy will be adapted when the cloud host is restarted.

(Figure 4 looks for MTU in Advanced Settings)

(Figure 5 Modifies Cloud Platform MTU)

Testing on cloud hosts:

Command test before modification, showing data is too long

#ping  192.168.1.203 - M  Do - S  8972

(Figure 6 tests sending 9000 packets)

The modification was tested with the same command and sent successfully.

(Test results in Figure 7)