What must be used when implementing the backbone multicast feature to isolate multicasts
in the SPBM region?
A.
maximum of two Equal Cost Tree (ECT) algorithms
B.
single l-SID for all VLANs belonging to the same customer
C.
head-end replication for multicasts
D.
odd-numbered VLAN IDs for B-VLANs
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correct is C
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head-end replication uses unicasting,
Correct is D
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CORRECT IS D
EXPLANATION:
Multicast B-VLAN
By default, the device uses one B-VLAN to transmit both unicast and multicast traffic.
If the multicast B-VLAN feature is enabled, you must assign an odd B-VLAN ID to an I-SID for SPBM to
transmit unicast traffic. SPBM automatically chooses the next higher even B-VLAN ID (odd B-VLAN ID plus
1) for multicast traffic.
ISIS-SPB only advertises the odd B-VLAN IDs. It uses the odd B-VLAN IDs when populating the unicast
FDB table with routes. When populating the multicast FDB table with routes, it uses the even B-VLAN IDs.
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