Hi,
HSRP/VRRP active/active with vPC
HSRP (Hot Standby Router Protocol) and VRRP (Virtual Router Redundancy Protocol) are both network protocols
that provides high availability for servers IP default gateway.
vPC domain at aggregation layer usually performs L2/L3 boundary so each vPC peer device is configure with
interface VLAN (or SVI) and HSRP or VRRP runs on top of this interface.
HSRP and VRRP in the context of vPC have been improved from a functional and implementation standpoint to
take full benefits of the L2 dual-active peer devices nature offered by vPC technology:
HSRP and VRRP operate in active-active mode from data plane standpoint, as opposed to classical active/standby
implementation with STP based network.
No additional configuration is required. As soon as vPC domain is configured and interface VLAN with associated
HSRP or VRRP group is activated, HSRP or VRRP will behave by default in active/active mode (on data plane side).
Have a look at this link for more info:
http://www.cisco.com/en/US/docs/switches/datacenter/sw/design/vpc_design/vpc_best_practices_design_guide.pdf
HTH