234 Configuring network domains

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Figure 4. Network domain

In a Network Domain, one or more WSSs acts as a seed device. A Network Domain seed stores information about all of
the VLANs on the Network Domain members. The Network Domain seeds share this information among themselves, so
that every seed has an identical database. In the example above, one WSS at each site is a Network Domain seed.
Each Network Domain member maintains a TCP connection to one of the seeds. When a Network Domain member
needs information about a VLAN in a remote Mobility Domain, it consults the Network Domain seed to which it is
connected. If the seed has information about the remote VLAN, it responds with the IP address of a WSS where the
VLAN exists. A VLAN tunnel is then created between the WSS and the remote WSS.
Figure 5 illustrates how user Bob, who is based at Sales Office C gets connectivity and is placed in a VLAN when he
visits the Corporate Office.
Sales Office A
WAN Link
Layer 2-3
Layer 2-3 Layer 2-3
Sales Office B Sales Office C
Branch Office 2Branch Office 1
Corporate Office
ND Seed
Peer
ND Seed
Peer
ND Seed
Peer
ND Seed
Peer
ND Seed
Peer
ND Seed
Peer