DNAC interface subnet size and switch-side config

[Csaba Nagy]

What's the minimum recommended size of the DNA-C 10G interface subnets?  A /28 for each interface should be more than enough allowing enough addresses for all 3 nodes including the VIP addresses too, shouldn't it?

In case of M4 appliance the switchports for the DNA-C 10G interfaces has to be configured as trunk while in case of M5 they have to be access ports. Is there anything else to watch out for M5 configuration?

[Preston Chilcote]

Sounds like you are asking about the cluster link.  This requires a minimum /21.

See "Required Subnets and Additional IP Addresses" section of below document

https://www.cisco.com/c/en/us/td/docs/cloud-systems-management/network-automation-and-management/dna-center/1-3-1-0/install_guide/M4/b_cisco_dna_center_install_guide_1_3_1_0_M4/b_cisco_dna_center_install_guide_1_3_1_0_M4_chapter_01.html#concept_ig4_1...

The reason why is also explained at the end of that section.

The M5 install guide, for comparison, is here:

https://www.cisco.com/c/en/us/td/docs/cloud-systems-management/network-automation-and-management/dna-center/1-3-1-0/install_guide/M5/b_cisco_dna_center_install_guide_1_3_1_0_M5/b_cisco_dna_center_install_guide_1_3_1_0_M5_chapter_01.html

[Csaba Nagy]

Hello Preston,

My question is more about the interface (Enterprise and Cluster) configuration in Maglev, they are steps 7 and 8 in the install guide:

https://www.cisco.com/c/en/us/td/docs/cloud-systems-management/network-automation-and-management/dna-center/1-3-1-0/install_guide/M5/b_cisco_dna_center_install_guide_1_3_1_0_M5/b_cisco_dna_center_install_guide_1_3_1_0_M5_chapter_0100.html

The /21 Services and Cluster Services are configured at Step 13 and they are different from the interface subnets.

What's the minimum size of the interface subnets?

Thanks,

Csaba

[Preston Chilcote · Accepted solution]

Ah, thanks for the clarification. I don't think any of the interfaces need more than 4 IP's (3 physical + 1 Virtual). Maybe we need to document that as well.