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Thursday, September 6, 2012

Choice of right interface encapsulation of VPLS in Juniper switching

We would like to configure the vlan-id blow 512 and we know that only the encapsulation that “extended-vlan-vpls” and “flexible-ethernet-services” can support it. Our case is without the special function ,so we are confused on which encapsulation to use. Can you suggest the best practice?


If you configure "flexible-ethernet-services" encapsulation for a physical interface,  the you can configure different encapsulations under the logical sub-interfaces.

xe-3/2/0 {
        flexible-vlan-tagging;
        encapsulation flexible-ethernet-services;
        unit 3401 {
            encapsulation vlan-vpls;
            vlan-id 3400;
            }
       unit 3400 {
            encapsulation vlan-ccc;
            vlan-id 3400;
            }
        }


That means you can configure different types of  services  ( VPLS, L2VPN etc ) under a single physical interface. But, this encapsulation is supported by certain types of hardware.

Please click here for documentation from Juniper Networks on encapsulation.


"flexible-ethernet-services—For Gigabit Ethernet IQ interfaces and Gigabit Ethernet PICs with small form-factor pluggable transceivers (SFPs) (except the 10-port Gigabit Ethernet PIC and the built-in Gigabit Ethernet port on the M7i router), use flexible Ethernet services encapsulation when you want to configure multiple per-unit Ethernet encapsulations."

On the other hand, if you configure "extended-vlan-vpls",  you will be able to configure VPLS services only in that interface / logical interfaces.


Also keep in mind that changing the encapsulation on the physical interface is going to bounce all logical interfaces associated with it, so you may want to do that in a maintenance window.



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