Configuring Qualified BUM Pruning for a Dual-Tagged Interface with Inner VLAN list and InnerVLAN range for a VPLS Routing Instance

Currently, dual-tagged subscriber interfaces can support a single pair of service-provider VLAN and subscriber VLAN. With the support for broadcast, unknown unicast, multicast (BUM) pruning of VPLS traffic on dual-tagged interfaces, you can configure a single service provider VLAN— referred to as VLAN(S) in this topic —on the subscriber interface and map it to multiple customer VLANs by using a single inner VLAN list or inner VLAN range. The inner VLAN list on a subscriber interface can have multiple elements. Each element of the inner VLAN list can be a single VLAN tag or a range of VLANs. The BUM traffic flow through dual-tagged interfaces is supported on both aggregated and nonaggregated subscriber interfaces. When BUM traffic exits a subscriber interface that has an inner VLAN list or range configured, the VLAN(S) and the subscriber VLAN— referred to as VLAN(C)— in the packet are checked against all combinations of VLAN(S) and VLAN(C) possible on the interface. If the packet contents match any of the combinations, then the packet is forwarded on the subscriber interface. If the contents do not match any combination, then the packet is discarded. If the subscriber has a VLAN map configured, then the VLAN(S) and VLAN(C) to be checked are modified based on the VLAN normalization on the interface.