How to configure MAD on S series modular switches

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For S series switches, when a cluster splits, two master switches may exist on the network, affecting network operations. In this case, you can configure MAD in direct mode for specified ports in a CSS to reduce the impact of a cluster split on the network. Alternatively, you can configure MAD in relay mode on specified Eth-Trunk ports.
1. Configuring MAD in direct mode
MAD in direct mode can only be configured on Layer 2 Ethernet ports, and ports must be in Up state.
# Configure MAD in direct mode on GigabitEthernet1/2/0/0.
[CSS] interface gigabitethernet 1/2/0/0
[CSS-GigabitEthernet1/2/0/0] mad detect mode direct //Command line format in V200R002C00 and earlier versions: dual-active detect mode direct
# Configure MAD in direct mode on GigabitEthernet2/10/0/0.
[CSS] interface gigabitethernet 2/10/0/0
[CSS-GigabitEthernet2/10/0/0] mad detect mode direct //Command line format in V200R002C00 and earlier versions: dual-active detect mode direct
2. Configuring MAD in relay mode
# In the CSS, configure MAD in relay mode for the inter-device Eth-Trunk.
[CSS] interface eth-trunk 20
[CSS-Eth-Trunk20] mad detect mode relay //Command line format in V200R002C00 and earlier versions: dual-active detect mode relay
[CSS-Eth-Trunk20] quit
[CSS] quit
# Configure MAD in relay mode on SwitchC.
[SwitchC] interface eth-trunk 20
[SwitchC-Eth-Trunk20] mad relay //Command line format in V200R002C00 and earlier versions: dual-active relay

Other related questions:
How to restart the CSS of S series modular switches
After S series modular switches establish a CSS, two devices are virtualized into one logical switch. You can run the reboot command to restart the CSS.

MPU types on S series modular switches
Different S series switches have different MPUs: S9303: LE0MMCUA and LE0DMCUA S9306&S9312: LE0MSRUA, LE0DSRUA, LE0D00SRUB00, LE1D2SRUE000, and LE1D2SRUH000 S9310: LE1D2SRUKC00 S7703: ES0D00MCUA00 and ES1D2MCUAC00 S7706&S7712: ES0D00SRUA00, ES1D2SRUAC00, ES0D00SRUB00, ES1D2SRUE000, and ES1D2SRUH000 S9703: EH1D2MCUAC00 S9706&S9712: EH1D2SRUDC00, EH1D2SRUC000, and EH1D2SRUDC01 S12704&S12708&S12712: ET1D2MPUA000 S12710: ET1D2MPUBC00

How to split a CSS composed of S series modular switches
Perform the following steps to split the CSS of S series modular switches (two standalone switches are restored): 1. Back up the configuration file. (1) Run the save command to save the setting. (2) Run the copy source-filename destination-filename all command to back up the configuration file to the standby switch. Note: Back up the current configuration file to the storage medium of the standby switch before you split the CSS. You can use the configuration file when you set up a CSS next time. 2. Delete the CSS system MAC address. (1) Run the system-view command to enter the system view. (2) Run the undo set css system-mac command to delete the CSS system MAC address. 3. Disable the CSS function. Run the undo css enable all command to disable the CSS function on two member switches. Two standalone switches are restored after they restart. 4. Restore physical member ports to service ports. (This step is required only in service port clustering.) Note: To restore a physical member port to a service port on a standalone switch, run the undo interface css-port command. To restore a physical member port to a service port in a CSS, run the shutdown interface ** command in the logical CSS port view to shut down the physical member port and then run the undo port interface ** enable command. 5. Power off the switches and remove the cluster cables. You can also remove the cluster cables when the switches are running.

Whether S series switches support NAT
S series switches do not support NAT, but S series modular switches configured with SPUs support NAT. 1. S series fixed switches do not support NAT. 2. S7700 and S9700 series modular switches configured with SPUs support NAT. 3. S9300 series modular switches configured with SPUs support NAT. 4. S12700 series modular switches do not support NAT.

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