Nexus access device attached to dual homed vPC

[rajkumar sanapala]

Hi

In the above diagram , If if access device are  dual homed to both N7k`s vPC domain( Primary & Secondary).

in this secenario, for example if the server connected to access switch( below ) needs to communicate the destination server  which is behind the 7K`s vPC domain., questions is  only primary switch is reponsible to forward the packets to destination or both( prim & Secondary 7K`s)

if u say both primary & secondary , can some one explain how it is ??

Thanks

[Reza Sharifi]

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