Configuring Ethernet Interfaces for IP Routing on DSC SWe

You can log onto either the Management and Routing VM1 or VM2 to configure the Ethernet interfaces for IP routing.

To configure Routing IP Network

1. From the Main Menu, click IP Networking.
   
   
2. Click Network Interfaces.
    
3. Click Routing IP Network.
   
4. Use the Add New Routing Subnet drop-down list to select a required subnet.
   
   
5. Click Add.
   
   
6. Enter a valid IP address and Netmask.
   
   

7. Click Save and Restart Networking.

   Caution

   Restarting networking can cause a momentary interruption in transmitting traffic and some messages can be lost. It is recommended that this action is executed during a maintenance window.

Configuring the IP/SCTP Packet Size   

This unlicensed feature supported on the DSC SWe (on KVM, on VMware, and on OpenStack) allows you to configure the IP/SCTP packet [also referred to as Maximum Transmission Unit (MTU) size (in bytes)] for the DSC SWe routing interfaces to best suit your unique networking environment. 

The routing interfaces on the DSC SWe are pkt0 and pkt1. Configuring the MTU size for these routing interfaces can be done using the Web UI. This UI displays the ACTUAL and Configured MTU. If the MTU size has not been configured, the Configured MTU input box will be blank (Unset).

The Configured MTU size limits for the DSC SWe are between 1,280 bytes up to 65,535 bytes. MTU sizes below 1,280 or above 65,535 bytes are not accepted by the Web UI. If the configured MTU size is above the limit supported by the OS, an error message is displayed informing you that the MTU size is not supported by the platform. This value may be below 65,535 depending on the system variant.

System performance can be impacted negatively and positively by changing the default MTU size. Configuring a low MTU size can impact performance negatively due to more packets being sent. Configuring a high(er) MTU size can impact performance positively but there can be packet loss if the external routers have problems with the bigger packets.

The Configured MTU size survives reboot, upgrade, and network restart. In case of a rollback, this value returns to the MTU size that was configured before the software upgrade.

Additional considerations for this feature are as follows:

• Only a root user can reconfigure the MTU size.
• Configured MTU size will be blank/unset for all interfaces when upgrading a DSC SWe to 17.0.0.R00 or higher.
• Changing the Configured MTU size takes effect immediately without a network restart.

To configure the IP/SCTP packet size

1. From the Main Menu, click IP Networking.
   
   
2. Using the Network Interfaces on drop-down menu, select the required Routing VM.
   
   
3. In the text box for the Configured: value, enter the required MTU size.
   
   
   

4. Click Apply MTU.