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PPPoE MTU Configuration

To avoid fragmentation and reassembly, Ethernet access networks require larger MTU sizes for PPP traffic. With JUNOSe PPPoE MTU, you can control the deployment of larger packet sizes. You can configure PPPoE MTU directly on the PPPoE interface or use a dynamic configuration profile. When you use the PPPoE MTU tag, each PPPoE subinterface can have a unique MTU value. Operational MTU is the lesser of the PPPoE MTU or the lower layer MTU minus the PPPoE overhead.

You can use the pppoe mtu command to set the MTU using a combination of lower layer restrictions and controls:

Greater MTU than the current maximum permitted by RFC 2516, with the default equal to the current maximum setting (1494 octets)
Optional setting for absolute maximum PPPoE MTU
Optional use of a larger lower layer MTU
Optional use of the PPPoE-Max-Mtu tag transmitted from the client

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