Question: In an Instant cluster, how do I verify if the configuration is in sync between master and member Instant APs?
Environment: This article applies to Instant Access Point.
Instant architecture works on Layer 2 and the IAP that has taken up the role of Virtual Controller sends a master heartbeat every seconds to member IAPs. If the member IAP do not receive the hearbeat for 3 seconds, it would decide to go for a election.
Similarly, due to congestion in the wired network, there configuration sync between Master and member IAPs. So, before troubleshooting into any configuration related issue, it is recommended to see if the sync is complete between IAPs.
Before making a change, below is the checksum in master and slave instant APs:
Master# show ap checksum | include Checksum
Checksum :34771
Master#
Member-IAP# show ap checksum | include Checksum
Checksum :34771
Member-IAP#
Configuring Virtual Controller IP address to impose a change. This will help us to understand the checksum sync between APs.
Master# configure terminal
We now support CLI commit model, please type "commit apply" for configuration to take effect.
Master (config) # virtual-controller-ip 10.17.169.65
Master (config) # end
Master# commit apply
committing configuration...
configuration committed.
Master# show summary | include VC
VC IP Addres :10.17.169.65
VC VLAN :0
VC Mask :0.0.0.0
VC Gateway :0.0.0.0
Number of VC transition :0
Now, let us see if the configuration is in sync by looking at the checksum on the Instant APs:
Master# show ap checksum | include Checksum
Checksum :16288
Master#
Member-IAP# show ap checksum | include Checksum
Checksum :16288
Member-IAP#
Thus by looking at the Checksum values on the Instant APs we can be sure of configuration sync between them.