OTV with ASR1002 -join interface MTU

[alieson]

Dears,

what is the best practice value for MTU of join interfaces that will assure resiliency of OTV traffic over multicast?

[Manish Gogna]

Hi,

OTV essentially uses a GRE header for transporting L2 traffic across the WAN.  This GRE header is 42 bytes in size.  In an ideal network deployment, the WAN link will have a maximum transmission unit (MTU) that is at least 42 bytes larger than the largest packet that OTV is expected to handle.

Manish

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[alieson]

Dear Manish,

I know this point but i am looking for someone who deployed OTV in live network and need to know the best practice value for MTU..

Thanks for your post :)