Posts in Category: ACI

What are the Endpoint Security Groups (ESGs) of ACI ?

You should have noticed the release 5.0(1) of Cisco ACI last week, it introduces a few new features among which we can find the Endpoint Security Groups (ESGs). Read more [...]

ACI | APIC unreachable after PCIe NIC card replacement

Following a hardware issue on a Cisco APIC, we had to replace the PCIe NIC card of the server (based on Cisco UCS). And as you may also encounter if you are reading this, it wasn't straight forward :) The initial problem was that the Eth2-1 and Eth2-2 ports went down after a few hours after each reboot, and that's a problem in an active APIC cluster... we decided to replace this APIC by the standby one in order to maintain a stable cluster of 3x APICs, before replacing the card. How to replace Read more [...]

ACI | Network 172.17.0.0/16 unreachable from APIC

Some days ago I had to configure a radius server on an APIC cluster. This server was addressed in the 172.17.0.0/16 range and it worked well for the spines and leaves of the fabric but not for any APIC of the cluster. From the APIC, we had the "unreachable" faults: From the CLI, the problem seemed more clear: APIC1# bashadmin@APIC1:~> ping 172.17.1.50PING 172.17.1.50 (172.17.1.50) 56(84) bytes of data.From 172.17.0.1 icmp_seq=1 Destination Host UnreachableFrom 172.17.0.1 icmp_seq=2 Destination Read more [...]