The correct answer is A because of the peer-gateway statement.
vPC HSRP Gateway Considerations
In normal Hot Standby Router Protocol operation, the active HSRP interface answers ARP
requests, but with a vPC, both HSRP interfaces (active and standby) can forward traffic.
The most significant difference between the HSRP implementation of a non-vPC configuration
and a vPC configuration is that the HSRP MAC addresses of a vPC configuration are
programmed with the G (gateway) flag on both systems, compared with a non-vPC configuration,
in which only the active HSRP interface can program the MAC address with the G
flag. Given this fact, routable traffic can be forwarded by both the vPC primary device (with
HSRP) and the vPC secondary device (with HSRP), with no need to send this traffic to the
HSRP primary device. Without this flag, traffic sent to the MAC address would not be routed.
Correct Answer is A.
(Cleared exam last week. Thanks for exam topics. It won't be possible without it! 105 questions in 120min are really challenging to think, Analys each question and answer)
A - The peer-gateway command does not change the way in which the router responds to ARP requests. Rather it results in a device e.g., R2, installing the MAC address of an interface on the vPC peer R1, into its own CAM table with the "Gateway" (G) flag set. This is simply to allow R2 to directly route traffic received on a vPC that was destined to the MAC address of R1.
vPC PeerGateway allows a vPC peer device to act as the active gateway for packets addressed to the other peer device router MAC.
https://www.cisco.com/c/dam/en/us/td/docs/switches/datacenter/sw/design/vpc_design/vpc_best_practices_design_guide.pdf
According to above answer should be A. But, I have a doubt...
To activate vPC peer-gateway capability, use the following command line (under vPC configuration context mode):
N7k(config-vpc-domain)# peer-gateway
In the exhibit line is under vrf, not sure if affects in something.
A
The vPC peer-gateway functionality allows a vPC switch to act as the active gateway for packets that are addressed to the router MAC address of the vPC peer.
This feature enables local forwarding of such packets without the need to cross the vPC peer-link
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