Cisco Systems C3850NM410G

There is a provision per WLAN that the administrator can configure, if they want a L2 roam like the Cisco Unified

Wireless Network, where both the PoP and PoA of the user moves. This is the nontunneled (nonsticky) L2 roam.

The advantage of this roam is that the roamed traffic does not need to be back-hauled to the PoP switch, since the

PoP moves along with the user mobility. The roamed traffic is terminated locally at the new mobility agent and

delivered to the wired world, decreasing latency for application traffic. This type of roam, though decreasing

application latency, might increase client roam times.

As Figure 20 shows, initial client join is on MA1. This wireless traffic is terminated locally and switched to the wired

world. When the clients roam to an access point connected to MA2, both PoP and PoA move to the new mobility

agent switch. No client state is retained by MA1, where the clients initially joined.

This roam is exactly like the existing Cisco Unified Wireless Network L2 roam.

Figure 20. L2 Roam in Nontunneled Mode in Converged Access

The L3 roams are supported by the tunneled (sticky) method, as explained earlier.