The TEP addresses prompted by my 1st APIC is 10.0.0.0/16

[Ibrahim Jamil]

Hi Guys

The TEP addresses prompted by my 1st APIC is 10.0.0.0/16

its huge Addresses spaces , also its overlapped by my internal

network

can i use the below subnet , as i have 2 spine and 6 leafs

10.0.254.0/24

thanks all

[RedNectar]

Hi Ibrahim,

TEP addresses are used for all sorts of things in ACI. There are anycast addresses for unknow MACs, another for unknown IPv4 addresses, and another for unknown IPv6 addresses. Every VPC pair of switches gets a TEP, and every remote switch, including Cisco AVE (Virtual) Switches.  So you may need more that you think as your network grows.

The minimun supported prefix is /22.  And CIsco DO recommend that these IP addresses are unique within your environment, but it is only in isolated cases that it would matter that the address space overlaps with your own address space.

So to answer your question

---

can i use the below subnet , as i have 2 spine and 6 leafs

10.0.254.0/24 

The answer is no - but you could get away with 10.0.252.0/22

I hope this helps

---

Don't forget to mark answers as correct if it solves your problem. This helps others find the correct answer if they search for the same problem

---

[Ibrahim Jamil]

Hello bro

actually we re using 10.0.0.0/8 in our Network

are we in stuck???

Regards

[RedNectar · Accepted solution]

Hi Ibrahim,

No - you are not stuck - but if you have already completed the install setup, you'll have to start again (which means wiping everything - see this answer to another question elsewhere)

Consider one of the following ranges:

172.16.0.0/22 (=172.16.0.0-172.16.3.255) or

172.16.4.0/22 (=172.16.4.0-172.16.7.255) or

...

172.31.252.0/22 (=172.31.252.0-172.31.255.255)

OR

192.168.0.0/22 (=192.168.0.0-192.168.3.255) or

192.168.4.0/22 (=192.168.0.0-192.168.7.255) or

...

192.168.252.0/22 (=192.168.0.0-192.168.255.255)

OR (from RFC 5735) even

198.18.0.0/22 (=198.18.0.0-198.18.3.255) or

198.18.4.0/22 (=198.18.0.0-198.18.7.255) or

...

198.19.252.0/22 (=198.19.252.0-198.19.255.255)

OR any other suitable RFC 5735 range

I hope this helps

---

Don't forget to mark answers as correct if it solves your problem. This helps others find the correct answer if they search for the same problem

---

[Ibrahim Jamil]

Thanks Sir