You can log onto either the Management and Routing VM1 or VM2 to configure the Ethernet interfaces for IP routing.
In this section:
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Click Save and Restart Networking.
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.
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.
This feature is not supported for the Management and Application VMs. The MTU for these VMs is set by the Dynamic Host Configuration Protocol (DHCP) to 1500 bytes by default that cannot be changed.
The routing interfaces on the DSC SWe are pkt0 and pkt1. Configuring the MTU size for these routing interfaces is 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:
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Click Apply MTU.
To unset the MTU size, delete the numerical value in the Configured text box and click Apply MTU.
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