4A0-105: Nokia Virtual Private LAN ServicesDemo

Question

How does PBB forward broadcast, unknown-unicast, and multicast traffic from a B-VPLS to an I-VPLS?

A The receiving PE checks the l-TAG in the l-SID to determine if there is a local l-VPLS on the node.
B The receiving PE checks the l-SID in the l-TAG to determine if there is a local l-VPLS on the node.
C The receiving PE checks the service label in the mpls header to determine if there is a local l-VPLS on the node.
D The receiving PE checks the multicast B-DA to see if an l-SID has been mapped to the B-DA that matches a local l-VPLS on the node.

Explanation

For broadcast, unknown-unicast, and multicast PBB traffic, the backbone destination MAC (B-DA) is a special group MAC derived from the I-SID. The receiving PE uses that multicast B-DA to identify the mapped local I-VPLS and deliver the traffic accordingly.

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IEEE 802.1ah Provider Backbone Bridging

4A0-105: Nokia Virtual Private LAN ServicesDemo

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Notes

Readiness

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