09-11-2017 04:42 AM - edited 03-08-2019 11:59 AM
Hello,
I have to create a vpc domain comprising of 2 x Cisco N93108TC-EX.
For the peer-link I intend to use a port-channel comprising of 2x40-G QSFP links on both the devices.
For the keep-alive I wanted to request advise on the following please:
1) Is it better to connect the mgmt-0 interface on both devices as a cross-connect (point-to-point) directly?
2) Is it better to use an out-of-band switch and then use the mgmt-0 interface?
3) Keep the mgmt-0 interface for pure out-of-band management and use a 1-Gig port under keep-alive dedicated vrf and connect the two swithces together in a cross-connect (point-to-point)?
4) Also, if the mgmt-0 interface can and/or should be used both for VPC keep-alive and out-of-band switch management as well?
I am thinking about using the mgmt-0 interface (under mgmt vrf) for pure out-of-band management and use 1-Gig port (under keep-alive dedicated vrf) for vpc keep-alive.
If it is essentail to know about the NX-OS please assume 7.x.
Please provide reasoning for your answers.
Kind advise.
Regards,
Abid Ghufran.
Solved! Go to Solution.
09-13-2017 10:11 AM
Hi Abid,
Regarding your vPC keepalive question - The Cisco Best Practice for the keepalive is the following, in descending order of preference:
1. Dedicated link(s) (1-Gigabit Ethernet port is enough) configured as L3. Port-channel with 2 X 1G port is even better.
2. Mgmt0 interface (along with management traffic)
3. As a last resort, route the peer-keepalive link over the Layer 3 infrastructure
In my experience working in the Datacenter TAC, most customers have the L3 dedicated port-channel between the vPC pair. You can also view this recommendation in the Nexus 9000 vPC Configuration Guide here
Hope that helps.
Thank you!
09-11-2017 06:56 AM
Hi,
Is it better to use an out-of-band switch and then use the mgmt-0 interface?
Yes, use mgmt-0 for that by connecting both interfaces to an OOB switch. This works really well.
Also, if the mgmt-0 interface can and/or should be used both for VPC keep-alive and out-of-band switch management as well?
Yes, that is correct. It can be used for both.
HTH
09-12-2017 09:51 AM
09-13-2017 10:11 AM
Hi Abid,
Regarding your vPC keepalive question - The Cisco Best Practice for the keepalive is the following, in descending order of preference:
1. Dedicated link(s) (1-Gigabit Ethernet port is enough) configured as L3. Port-channel with 2 X 1G port is even better.
2. Mgmt0 interface (along with management traffic)
3. As a last resort, route the peer-keepalive link over the Layer 3 infrastructure
In my experience working in the Datacenter TAC, most customers have the L3 dedicated port-channel between the vPC pair. You can also view this recommendation in the Nexus 9000 vPC Configuration Guide here
Hope that helps.
Thank you!
09-26-2017 02:54 AM
Thank you very much for the information you have provided. It is certainly what I had been looking - clear and precise.
Kind regards,
Abid Ghufan.
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