[j-nsp] stacked vlan

[sthaug at nethelp.no]

> can someone show me a good link on how JunOS process stacked vlan frames?
>   if I send frame with single 802.1q vlan tag, I want the ingress port on my M10 tag it with an outer vlan, then forwards it out through an egress port.
>   can someone provide sample config?

This sounds more like something you would do with a switch, for instance
what Cisco calls "QinQ" or "dot1q-tunnel".

An M router with suitable GigE IQ PIC can explicitly match outer *and*
inner VLAN tag, and this is very useful in some situations. Example
configs:

stacked-vlan-tagging;
encapsulation flexible-ethernet-services;
unit 1 {
    vlan-tags outer 1010 inner 102;
    family inet {
        address 10.81.254.1/24;
    }
}
unit 2 {
    encapsulation vlan-ccc;
    vlan-tags outer 1562 inner 2350;
}

Steinar Haug, Nethelp consulting, sthaug at nethelp.no