12-03-2019 02:09 AM - edited 12-04-2019 12:29 AM
Hi all,
On Cisco ACI environment we have configured under tenant "common", vrf "Yellow", one Bridge Domain (BD_gateway_Yellow) with 3 lan:
Gw 1: 10.123.1.1/25
Gw 2: 10.123.1.129/25
Gw 3: 10.123.2.1/24
Each lan are used in a specific EPG:
Gw 1 --> EPG: Network
Gw 2 --> EPG: Storage
Gw 3 --> EPG: Unix
Each EPG have a contract that permit to contact those lans from networks that are outside Cisco ACI environment (L3out).
We have a problem just with the LAN 1: every client that are in this EPG, lost randomly connection to gateway and between clients. After some attempts to solve this problem, the solution was to create a new BD (BD_gateway_Network) just for lan 1, used only from EPG Network. With this configuration, there are not issue in connectivity.
My question is why the problem seems to be only for the lower subnet 10.123.1.0/25 and not for the higher 10.123.1.129/25?
Cisco ACI permits to create a L3 on BD and use it in specific EPG, and if we want we can do segmentation under a specific EPG, but in this case seems that the problem in only on lower subnet /25.
Kind regards,
Marco
12-03-2019 10:20 AM
When you create Subnet on BD , it is actually gateway IP. So 10.123.1.0/25 and 10.123.2.0/24 are not valid config.
Also, EPG is assoiated with the BD , not some "Lan"
12-03-2019 11:25 AM
Hi @marco1305 ,
@6askorobogatov is absolutely correct.
What you will need to so is:
I hope this helps
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12-04-2019 12:36 AM
Hi @RedNectar , @6askorobogatov
Thank you very much for your support.
I've correct the information on my post: actually, the configurations on BD are with default gateway .1 and not with .0.
My problem is that hosts in 10.123.1.1/25 lose randomly communication. On higher subnet 10.123.1.129/25 we don't have problems. The same on 10.123.2.0/24 where all works fine.
Is it possible that on Cisco ACI is better to configure a /24 instead of two /25, and do what we usually did with subnetting, using EGP segmentation?
Thank you,
Marco
12-04-2019 04:29 AM
12-05-2019 03:23 AM
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