[j-nsp] J4300 router FE Maximum MTU size

[Thomas Salmen]

I've had no problems setting the MTU as high as 9000 on a 4300 before (this
is on the built-in ports, I've never tried on a FE PIC, although I'd image
that should work also). Config (actually from a 4-port FE PIC in an M10, but
is the same on the J):

fe-0/2/3 {
    description "Access port";
    vlan-tagging;
    speed 100m;
    mtu 9000;
    link-mode full-duplex;
    unit 300 {
        description "Access VLAN";
        vlan-id 300;
        family inet {
            address192.168.1.1/30;
        }
    }
}

Cheers,
Thomas

> 
> Hi,
> 
> What is the Maximum MTU size that can be set on a J4300 R7.4 router with
> Fast Ethernet interface.
> 
> I tried to set it to 2000 using set interfaces fe-0/0/0 and then commit,
> it
> give:
> 
> Family MTU is too large relative to device MTU.
> 
> 
> I found this
> http://www.juniper.net/techpubs/software/junos/junos74/swconfig74-network-
> interfaces/html/interfaces-physical-config5.html
> but it does not list the data for J-series router.
> 
> Thanks
> Herman
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