Wednesday, June 3, 2020

JunOS vs iOS MTU handling

Hi folks,

I've got a BGP peer flapping between a juniper device I control and a Cisco device of a customer's. We've both confirmed timers look good, and we both confirmed we were set to 9000 for our MTU... However from the Cisco to juniper he can get a full 9000 df-bit ping across but I top out around 8972. Is this a common thing with the two calculating MTUs differently? And as such should I then ensure his MTU is greater than 9000 by enough for the headers/overhead to alleviate that issue?

Thanks for the help.



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