Home » Cisco » 300-165 » You have a vPC configuration with two functional peers. The peer link is up and the peer-link feature is restricted the spanning-tree operations in the configuration?
You have a vPC configuration with two functional peers. The peer link is up and the peer-link feature is restricted the spanning-tree operations in the configuration? (choose two)
A. The secondary switch process BPDUs only if the peer-link fails
B. The primary and secondary switch generate and process BPDUs
C. vPC imposes a rules that the peer link is always blocking
D. vPC removes some VLANs from the spanning tree form the spanning tree for vPC use
E. vPC requires the peer link to remain in the forwarding states.
Correct Answer: AE
Explanation/Reference:
A vPC deployment has two main spanning-tree modifications that matter: ? vPC imposes the rule that the peer link should never be blocking because this link carries important traffic such as the Cisco Fabric Services over Ethernet (CFSoE) Protocol. The peer link is always forwarding. ? For vPC ports only, the operational primary switch generates and processes BPDUs. The operational secondary switch forwards BPDUs to the primary switch.
There are two “variants” of this question. One says that “peer-switch is RESTRICTED by spanning-tree” (which should never happen, however…). In this case both switches will produce and process BPDUs, since they will think they have “split brain”.
Second variant does not say anything about “restriction on peer-switch link”. In this case only PRIMARY switch process BPDUs. Second switch receives it and FORWARDS to the primary switch.