Nexus 3548 x2 Stack

[bee7ch]

Hello,

We just unpack our new Nexuses and setup it in the network.

How I can to setup them in stack to access like one dedicated device ?

Or do I need to do vPC and manage it like this?

Thanks

[Mark Malone · Accepted solution]

Hi
Yes Nexus cant stack any of the models ,no need as they have VPC that's what you use
Then also you can connect non VPC switches like a stack of 3850s to each nexus under a standard port-channel there side and a VPC on the Nexus side for full resiliency and load balancing , very stable feature VPC

quick guide how to setup VPC , its 5ks but its same for each model in terms of VPC config

If you get stuck post what you have done i have multiple VPC setups in operation can assist with the config if needed

https://www.cisco.com/c/en/us/products/collateral/switches/nexus-5000-series-switches/configuration_guide_c07-543563.html

[bee7ch]

Hello Mark,

And the physical logic is next:

I have 2960 as access switches and I want to connect it to Nexus "stack".

I take two (e1/47, e1/48) links in port-channel from 2960 and put one link (e1/47) in Nexus1 e1/1 and second (e1/48) in Nexus2 e1/1.

Nexus1 e1/1 and in Nexus2 e1/1 - ports are in port-channel, of course.

Yep ?

Thanks

[Mark Malone]

Hi

you really only need 1 link per Nexus side and then 2 links on the individual 2960 , but you could use 4 for throughput resiliency

so would look something like below , the nexus would be in VPC port-channel config while the 2960 just standard PO config

EXAMPLE OF vpc po

interface port-channel15
  description VPC 15 ...........
  switchport mode trunk
  no lacp suspend-individual
  switchport trunk allowed vlan 2,10-11,17-18,20,28,31,33-34,36-39,48,50,64-65,72,74,76,78,80,105
  logging event port link-status
  logging event port trunk-status
  vpc 15

[bee7ch]

Mark,

And I found in manuals that only one of those Nexuses will be in active mode.

Thats mean, network bandwidth between 2960 and Nexus will be only 1G ?

Is it possible to put Nexuses in active-active mode ?

And another subject, I noticed that peer-link is used only for some system traffic etc. and not for normal traffic.

In that case, why there is a 2x 10G links for that ?

Thanks

[Mark Malone]

I believe that’s if your using peer-gateway setup its active/standby if you have NetApp filers you may require that design because of the way they forward traffic

This is it explained

https://supportforums.cisco.com/t5/network-infrastructure-documents/peer-gateway-feature-on-the-nexus-7000/ta-p/3113290

see this for active/active hsrp in vpc

http://www.ciscozine.com/nexus-vpc-hsrp-vrrp-active-active/

[cisco sepehr]

Thank you for your complete explanation قاب گوشی