--> Seamless Roaming is a event when client moves from one ap to other ap or one wireless controller to other controller without any latency.
--> In the case of when client is moving from one access point to other access point which belongs to same wireless controller, client entry is simply updated in the wireless controller to the new access point.
--> Whereas in the case of when client is moving from one access point to other access point which belongs to different wireless controller, client entry is transferred to new wireless controller from old wireless controller by using mobility messages.
--> The new wireless controller is called as Foreign Wireless Controller and old wireless controller is called as Anchor Wireless Controller.
--> The client has no knowledge on this and retains its original IP address on the new controller.
--> Traffic flow from the client or to the client becomes asymmetrical.
--> Traffic from the client is directly sent via foreign controller and traffic to the client is received by original controller and sent to foreign controller by Ethernet Over IP tunnel.
--> Asymmetric tunneling can cause issues if the firewall or upstream router is enabled with reverse path forwarding.
--> Cisco added symmetric mobility tunneling feature to avoid the limitation of asymmetric mobility tunneling.
--> If you want to use symmetric tunneling you should enable this on all wireless controllers.
REF: CISCO.COM
--> In the case of when client is moving from one access point to other access point which belongs to same wireless controller, client entry is simply updated in the wireless controller to the new access point.
--> Whereas in the case of when client is moving from one access point to other access point which belongs to different wireless controller, client entry is transferred to new wireless controller from old wireless controller by using mobility messages.
--> The new wireless controller is called as Foreign Wireless Controller and old wireless controller is called as Anchor Wireless Controller.
--> The client has no knowledge on this and retains its original IP address on the new controller.
--> Traffic flow from the client or to the client becomes asymmetrical.
--> Traffic from the client is directly sent via foreign controller and traffic to the client is received by original controller and sent to foreign controller by Ethernet Over IP tunnel.
--> Asymmetric tunneling can cause issues if the firewall or upstream router is enabled with reverse path forwarding.
--> Cisco added symmetric mobility tunneling feature to avoid the limitation of asymmetric mobility tunneling.
--> If you want to use symmetric tunneling you should enable this on all wireless controllers.
REF: CISCO.COM
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