cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
127
Views
1
Helpful
1
Replies

Unexpected forwarding decision | DROP

DanDan
Beginner
Beginner

Hello ACI people!

I came across a strange issue today.

I have a jumphost living in the fabric. From that jumphost I tried to reach two different hosts in the same subnet, external to the fabric.

I can ping one of them from the jumphost with no issues, however the other host is unreachable.

I did elam capture and ftriage and I can see it is dropped because of a missing contract.

For some reason first hop Leaf thinks that my destination is in a different EPG, where we do not have a contract in place so it drops the packet.

When I check the iproute on the Leaf, for both destinations it shows our ASA, as it should.

Have anyone experienced this before?

We are running on release 5.2(7g).

DanDan_0-1700509682104.png

Leaf is somehow classifying the external IP address as an internal host in a different EPG, which is absolutely incorrect.

Thank you for any thoughts.

1 Accepted Solution

Accepted Solutions

DanDan
Beginner
Beginner

Alright, issue is now solved!

https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-739989.html#L3Outendpointlearningconsiderations

 

DanDan_0-1700515646925.png

I had a stale endpoint on the border leaf, once I manually cleared the entry , it worked just fine.

I hope this helps to someone in the future.

Cheers.

View solution in original post

1 Reply 1

DanDan
Beginner
Beginner

Alright, issue is now solved!

https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-739989.html#L3Outendpointlearningconsiderations

 

DanDan_0-1700515646925.png

I had a stale endpoint on the border leaf, once I manually cleared the entry , it worked just fine.

I hope this helps to someone in the future.

Cheers.

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: