On the Alcatel-Lucent 7750 SR, how many queues per FC are available for multipoint traffic within a VPLS on service ingress?

The correct answer is C. 3. On the Alcatel-Lucent 7750 SR, service ingress queue policies for multipoint services like VPLS provide 3 queues per Forwarding Class (FC) - one each for Broadcast, Unknown unicast, and Multicast (BUM) traffic. This maps directly to the three distinct multipoint traffic types…

Ingress and Egress QoS

Question

Options

How the community answered

(46 responses)

A
2% (1)
B
2% (1)
C
89% (41)
D
7% (3)

Explanation

On the Alcatel-Lucent 7750 SR, service ingress queue policies for multipoint services like VPLS provide 3 queues per Forwarding Class (FC) - one each for Broadcast, Unknown unicast, and Multicast (BUM) traffic. This maps directly to the three distinct multipoint traffic types that VPLS must handle, making C the correct answer. The distractor values (64, 8, 16) correspond to other contexts on the 7750 SR - for example, 8 FCs exist per port, and 64/16 appear in other queue or scheduling contexts - but none describe multipoint queues per FC at service ingress. Option E (1) is wrong because a single queue cannot differentiate BUM traffic types, which is essential for proper VPLS forwarding policy.

Memory tip: Think BUM = 3 - Broadcast, Unknown unicast, Multicast gives you exactly 3 multipoint queues per FC, one for each letter.

Topics

#VPLS Queuing#Forwarding Classes#Ingress QoS#Multipoint Traffic

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