Re: HSRP in Nexus switch

It is hard to follow the exact request and answer in this email. It really depends on the setup of the nexus 5ks. If you are using vPC's the nexus switches will not forward a layer2 packet destined for the FHRP gateway if the packet originates from a downstream host on a vPC link. HSRP in the Nexus switches was tweaked so that the standby HSRP switch will forward the packet, although the packet was sent to the Mac address of the active HSRP switch. This however depends on which side the packet comes into the 5ks at if you are using vPC spanning tree towards your vPC downstream switch is turned off and all your downstream ports forward traffic.

I would have to see a diagram of what Imran was talking about to really see if the scenario would work. Do your 5ks have the routing module? Are your 5ks your distribution block, or do you have a upstream layer3.

Regards,
 Joe Sanchez

On Feb 1, 2012, at 7:23 AM, Carlos G Mendioroz <tron_at_huapi.ba.ar> wrote:

> Joe,
> what do you mean by "forward the traffic" ?
> Will it work any different than with any other frame whose destination is in the CAM ? Do you mean it will L3 process the packet ?
>
> -Carlos
>
> George J. Sanchez @ 31/01/2012 13:57 -0300 dixit:
>> The Nexus class switch HSRP protocol is different, the nexus standby and active states will respond to and forward traffic. The standby switch understands the packet is destined for the Mac address of the hsrp VIP and will forward the traffic.
>>
>> Regards,
>> Joe Sanchez
>>
>> On Jan 31, 2012, at 9:21 AM, Radioactive Frog<pbhatkoti_at_gmail.com> wrote:
>>
>>> As ryan said - GLBP not an option, however u can go for odd and even vlan
>>> with HSRP. Not true load balancing but it works in most of production
>>> environment.
>>>
>>>
>>> On Tue, Jan 31, 2012 at 7:52 AM, imran ali<s.imranali1_at_gmail.com> wrote:
>>>
>>>> Hi,
>>>>
>>>> Thanks Ryan,
>>>> yes i want to configure SVI's (gateway for servers) , can it work on
>>>> different domains e.g we have domain 1 in primary site and domain 2 in
>>>> secondary site ,
>>>>
>>>>
>>>> *Primary
>>>> Site
>>>> Secondary Site*
>>>>
>>>> [N5kSW2]<=Vpc peer link=>[N5KSW1]----------------- L2
>>>> VPLS------------------[N5kDRSW1]<=Vpc peer link=>[N5KDRSW2]
>>>>
>>>>
>>>>
>>>>
>>>> (v-block)
>>>> (v-block)
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> On Tue, Jan 31, 2012 at 12:28 AM, Ryan West<rwest_at_zyedge.com> wrote:
>>>>
>>>>> On Mon, Jan 30, 2012 at 14:44:24, imran ali wrote:
>>>>>> Subject: HSRP in Nexus switch
>>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> We need to configure HSRP in 4 x nexus 5k (2 secondaries and 2
>>>>>> primary switches), just i need your opinion guys it is possible ?
>>>>>>
>>>>>>
>>>>>
>>>>> If you're talking about different SVI's, then you could have 4 nexi. The
>>>>> 5k does not support GLBP, so I think you're stuck with an active and
>>>>> standby router.
>>>>>
>>>>>
>>>>>
>>>> http://www.cisco.com/en/US/products/ps9670/products_installation_and_configuration_guides_list.html
>>>>>
>>>>> Unicast routing guide should have what you need.
>>>>>
>>>>> -ryan
>>>>
>>>>
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>
> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina

Blogs and organic groups at http://www.ccie.net
Received on Thu Feb 02 2012 - 07:08:03 ART