180 Configuring network domainsNN47250-500 (320657-F Version 02.01)Figure 1. Network domainIn a Network Domain, one or more WSSs acts as a seed device. A Network Domain seed stores information about all ofthe VLANs on the Network Domain members. The Network Domain seeds share this information among themselves, sothat 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 memberneeds information about a VLAN in a remote Mobility Domain, it consults the Network Domain seed to which it isconnected. If the seed has information about the remote VLAN, it responds with the IP address of a WSS where theVLAN exists. A VLAN tunnel is then created between the WSS and the remote WSS.Figure 2 illustrates how user Bob, who is based at Sales Office C gets connectivity and is placed in a VLAN when hevisits the Corporate Office.Sales Office AWAN LinkLayer 2-3Layer 2-3 Layer 2-3Sales Office B Sales Office CBranch Office 2Branch Office 1Corporate OfficeND SeedPeerND SeedPeerND SeedPeerND SeedPeerND SeedPeerND SeedPeer
