[c-nsp] FHRP selection within Nexus

[Tim Stevenson]

At 11:03 AM 11/13/2013  Wednesday, Gert Doering pronounced:
>Hi,
>
>On Thu, Nov 14, 2013 at 05:51:15AM +1100, Andrew Miehs wrote:
> > > How does that work?
> > >
> > > Have a read of
> > 
> http://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps9670/C07-572835-00_NX-OS_vPC_DG.pdf
> > The bottom of page 24...
> >
> > HSRP
> > The use of HSRP in the context of vPC does not require any special
> > configuration. With vPC, only the active HSRP
> > interface answers ARP requests, but both HSRP interfaces (active and
> > standby) can forward traffic.
> > If an ARP request coming from a server arrives on the secondary HSRP
> > device, it is forwarded to the active HSRP
> > device through the peer link.
>
>"forwarding to the active HSRP device" and "only the active HSRP interface
>answers ARP request" doesn't particularily sound "active-active" to me :-)


You're confusing "ARP" and "data packets".

ARP is handled by the control plane active; data packets are handled 
by either VPC peer.

Tim


>*This* is what happens on any 6500 that does HSRP on a SVI...
>
>GLBP is active-active in that both L3 routers will accept packets to the
>world, instead of L2-forwarding them to the other one inside the SVI.
>
>gert
>--
>USENET is *not* the non-clickable part of WWW!
> 
>//www.muc.de/~gert/
>Gert Doering - Munich, Germany                             gert at greenie.muc.de
>fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
>
>
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Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Distinguished Technical Marketing Engineer, Cisco Nexus 7000
Cisco - http://www.cisco.com
IP Phone: 408-526-6759
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