Wired Controlling - Brocade Communications Systems RFS6000 System Reference Manual

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Software overview
Roaming within the controller
When a Client is assigned to a VLAN, the controller registers the VLAN assignment in its credential
cache. If the Client roams, it is assigned back to its earlier assigned VLAN. The cache is flushed
upon detected Client inactivity or if the Client associates over a different WLAN (on the same
controller).
Roaming across a cluster
Clients roam amongst controller cluster members. The controller must ensure a VLAN remains
unchanged as an Client roams. This is accomplished by passing Client VLAN information across the
cluster using the interface used by a hotspot. It automatically passes the username/password
across the credential caches of the member controllers. This ensures a VLAN Client association is
maintained even while the Client roams amongst cluster members.
Roaming across a layer 3 mobility domain
When an Client roams amongst controllers in different Layer 3 mobility domains, Layer 3 ensures
traffic is tunneled back to the correct VLAN (on the home controller).
Interaction with Radius assigned VLANs
Multiple VLANs per WLAN can co-exist with VLANs assigned by a Radius server. Upon association,
an Client is assigned to a VLAN from a pool of available VLANs. When the Radius server assigns the
user another VLAN, Client traffic is forwarded to that VLAN.
When 802.1x is used, traffic from the Client is dropped until authentication is completed. None of
the Client data is sent onto the temporarily VLAN. A Radius assigned VLAN overrides the statically
assigned VLAN.
If the Radius assigned VLAN is among the VLANs assigned to a WLAN, it is available for VLAN
assignment in the future. If the Radius assigned VLAN is not one of the VLANs assigned to a WLAN,
it is not available for future VLAN assignment. To configure Multiple VLANs for a single WLAN, see
"Assigning multiple VLANs per WLAN"

Wired controlling

The controller includes the following wired controlling features:
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DHCP servers
Dynamic Host Configuration Protocol (DHCP) allows hosts on an IP network to request and be
assigned IP addresses as well as discover information about the network to which they are
attached. Each subnet may be configured with its own address pool. Whenever a DHCP client
requests an IP address, the DHCP server assigns an IP address from that subnet's address pool.
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In general, when there are multiple VLANs mapped to the same WLAN, the broadcast buffer
queue size scales linearly to accommodate a potential increase in the broadcast packet
stream.
DHCP servers
DHCP user class options
DDNS
VLAN enhancements
Interface management
on page 114.
Brocade Mobility RFS6000 and RFS7000 System Reference Guide
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