ACI Multipod Extended Community and DHCP Relay

[udo.konstantin]

Hello,

from the ACI Multipod documentation I found two configuration parts which are not clearly explained:

1. I know there must be a extended community set on POD 1 and POD2. Following the documentation the extended community should be: extended:as2:nn4:5:16. Should this be the same on both sides or/and can this different? 

2. The IPN Interfaces must habe a DHCP relay configuration which is pointing to the APIC controller? This mean, the IPN device _must_ reach the OoB Interface of the controller?! 

Thanks 

Udo 

[Manuel Velasco]

The extended community, will be the same for both pods on the multi-pod set up, plus I believe this a global configuration for all the pod in the multi-pod set up,

Multi-pod White Paper

https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-739714.html#_Toc495712870

Regarding the DHCP relay configuration, yes it needs to point the the APIC controllers, but to the internal fabric IP derived from the TEP pool you assigned when bringing this fabric from the first time.  Usually the APIC controllers get the first 3 IP from the TEP pool.  For example if your TEP pool was 10.0.0.0/16 APIC would get assign IPs 

APIC1: 10.0.0.1

APIC2: 10.0.0.2

APIC3: 10.0.0.3

If you want to find the addresses assigned to your APIC you can ssh to one of them and type the “show controller” command this information would be under the address column.

please let me know if this helps