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Bridging and BA Classifiers

On the M320 and M120 routers equipped with IQ2 PICs, you can configure BA classification based on the IEEE 802.1 bits for bridged Ethernet over Asynchronous Transfer Mode (ATM), Point-to-Point Protocol (PPP), and frame relay for VPLS applications. The BA classification is applied to the first (outer) tag when tagged frames are received. Untagged frames are bypassed and a value of 000 for the classification IEEE 802.1p bits is assumed. There is no support for circuit cross-connect (CCC), and only port-mode VPLS is supported (in port-mode VPLS, only VLANs on a single physical port are included in the VPLS instance). There is no support for multilink PPP bonding with VPLS. For bridging over frame relay, only frames that do not preserve the frame check sequence (FCS) field are supported. Frames that preserve the FCS field are silently discarded.

The bridging over PPP function is restricted:

There is no support for “tinygram” compression and expansion.
Frames received with preserved FCS bits are silently discarded.
Bridge control frames are also classified based on header bit values.
Both tagged and untagged frames are classified and forwarded. The peer must discard frame types that are not supported.

This example applies an IEEE 802.1p classifier named ppp-ether-vpls-classifier to an interface (so-1/2/3) with Ethernet VPLS over PPP encapsulation. Note that the interface and CoS configuration must be consistent to support the feature. You must also configure the classifier and other CoS parameters such as forwarding classes.



[edit class-of-service]
interfaces {


so-1/2/3 {


unit 0 {


classifiers {
ieee-802.1 ppp-ether-vpls-classifier;
}


}


}


}

[edit interfaces]
s0–1/2/3 {
encapsulaton ether-vpls-over-ppp;


unit 0 {
family vpls;
}


}

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