[j-nsp] GRE packet fragmentation on j-series

[Lukasz Martyniak]

Hi all 

I have some problem with gre tunnels. I need to fragment packages in tunnel. I run gre between two jseries (junos 10.4R6) and lunch MPLS on it. The problem looks like that packages with MTU above 1476 are not fragmented/reassembled and are dropped.


interfaces gr-0/0/0 
unit 10 {
    clear-dont-fragment-bit;
    description "Tulne to r1-lab";
    tunnel {
        source 10.200.0.1;
        destination 10.200.0.2;
        allow-fragmentation;
        path-mtu-discovery;
    }
    family inet {
        mtu 1500;
        address 100.100.100.1/30;
    }
    family mpls {
    }
}

Have someone have similar problem ? is there a simple way to fix this ?

Best Lukasz