Hi Xyhue,

As far as I know IPv4 fragmentation / reassembly is not supported on the tunnel 
types you listed.
IP{4,6} fragmentation / reassembly is supported for IPv4 over IPv6 tunnels 
(src/vnet/map), but I think that's it.

In general the recommendation is to avoid fragmentation in tunnels because of 
the associated cost in reassembly for the tunnel endpoint. You _can_ of course, 
and feel free to have a go at implementing it if you like.

Best regards,
Ole

> A detailed description of my problem:
> I would like to test ip fragment reassembly,but it didn't work.Is there 
> anything wrong in my configuration:
> set interface mtu 2000 host-eth2
> 
> Did I miss anything configuration?
> If vpp support ip fragment reassembly on host interface . Does VPP support 
> the IP fragment reassembly on the virtual interface we created, such as the 
> GRE interface?
> 
> Thanks,
> xyxue
> 
> From: xy...@fiberhome.com
> Date: 2017-05-08 15:42
> To: otroan
> CC: vpp-dev
> Subject: Re: Re: [vpp-dev] sharding in tunnel
> 
> I'm sorry I didn't say it clearly.
> My questions:
> Does the VPP support ip fragment  in GRE、L2TP、MPLS tunnel?
> Whether the tunnel supports configuring the MTU?
> Whether the receiver supports  ip reassembly?
> 
> Thanks,
> xyxue
> 
> 
> From: otroan
> Date: 2017-05-08 15:16
> To: 薛欣颖
> CC: vpp-dev
> Subject: Re: [vpp-dev] sharding in tunnel
> > When the IP message enters the GRE、L2TP、MPLS tunnel, does the VPP support 
> > sharding?
> 
> I'm not quite sure what "sharding" would mean in this context.
> Are you thinking of point to multipoint tunnels? Or ECMP to a set of anycast 
> tunnel destinations or something completely different?
> 
> Cheers,
> Ole

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