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Change BD setting from flood to Hardware proxy

jvetrive
Cisco Employee
Cisco Employee

Change BD setting from flood to Hardware proxy will interrupt the traffic?

 

Already 70 plus endpoints learned in fabric.

 

which is the best method to perform this change without any traffic interrupt

 

 

 

 

4 Replies 4

Jayesh Singh
Cisco Employee
Cisco Employee

Hello,

 

Most of the changes in BD config requires removal of entries in mapping database and relearning of the endpoints, hence they are disruptive. One of such setting is changing unknown unicast flooding mode to hardware proxy mode and vice-versa.

 

I would suggest to perform this activity during a planned maintenance window considering some downtime.

 

Regards,

Jayesh

 

Rate all post that are helpful. Mark it as a solution if it solves your problem, it might help other users who have the same query.

How about enabling 'Limit IP learning to subnet' ?

That would also have the same impact, all endpoints in the EPGs associated to that BD will be cleared and re-learning will be done. So, slight disruption is expected.

 

Regards,

Jayesh

jvetrive,

    Please take a moment to view the following white paper on endpoint learning behaviors in ACI:

https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-739989.html

 

In it you will find some answers to your queries as well as surrounding info on various features that impact/change the way ACI learns:

 

      

Prior to Cisco ACI Release 3.0(1k), if the Limit IP Learning To Subnet option was enabled when the bridge domain was configured for unicast routing, you could experience an impact of 120 seconds as the bridge domain endpoint table is flushed and endpoint learning for IP addresses would be paused (for 120 seconds).

        

When migrating Layer 3 gateway (L3GW) connectivity to Cisco ACI, you can mitigate this impact by enabling the Limit IP Learning To Subnet option when the bridge domain is configured as a Layer 2–only bridge domain. After you have enabled the option, wait 120 seconds for the timer to expire. Then enable the Unicast Routing option. Because you are not learning IP endpoints on the bridge domain (because it is an L2BD), the 120-second timer will not affect the learning of new MAC-based endpoints.

 

 

As for your initial question, it looks like it has been asked historically within the support forums:

https://community.cisco.com/t5/application-centric/modification-on-unknown-unicast-policy/td-p/3417884

 

-Gabriel

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