On Fri, 15 Apr 2016, CiscoNSP List wrote:
My question is why? i.e. Why would reducing our PE's Ints MTU size to
1500 "allow" packets above 1500bytes to pass fragmented, but at 9100,
they were dropped?
There are two values here, MTU and MRU.
Some devices configured for 1500 MTU are capable of receiving 9100
unfragmented packet, but will not transmit more than 1500 bytes (thus
fragmenting before sending).
So most likely, the CE had MTU and MRU set to 1500, and since the 9100
sized unfragmented packet sent from the PE to the CE was higher than the
MRU, it was dropped.
If there were some L2 switches in between the PE and CE, then it/they
might have dropped it.
--
Mikael Abrahamsson email: [email protected]
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