Heads Up :
The post you are writing will appear in a public forum. Please ensure all content is appropriate for public consumption. Review the employee guidelines for the community here.
There is also an excellent post by Brad Hedlund on his blog diagraming and explaining supported and unsupported designs for routing over vPC peer-link:http://bradhedlund.com/2010/12/16/routing-over-nexus-7000-vpc-peer-link-yes-and-no/
the peer-gateway command does like you stated: it allows the active router to forward packets it receives that are destined for the MAC address of the physical interface of its HSRP peer.In theory, yes, everything should have a destination MAC addres...