> i actually use GRE to establishs BGP connections , that means all 
> forwarding data will going in the GRE tunnel ,  what do you think of 
> this GRE perfermence limitation ?

Depends on the kernel and cpu GHz rate used to process GRE.
What CPU is in use ? What kernel ? I assume that forwarding is
the limitation at 20 Gbit/s, not the GRE processing of the
BGP protocol.

The best way to find out is benchmarking with/without GRE,
if you have the additional spare boxes laying around 8-} 

p...@opsec.eu            +49 171 3101372                         3 years to go !
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