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Virtual Interface
(mandatory)
Service-Port Interface
(optional)
Dynamic Interface
(optional)
It is used to support mobility management, DHCP relay, and serves
as the redirect address for guest web authentication login window.
All WLAN controllers within a mobility group must be configured
with the same virtual interface IP address in order to support intercontroller
roaming.
It is mapped by the system to the service port. It must be configured
with an IP address on a different supernet from the management,
AP-manager, and any dynamic interfaces. Static routes must be
configured instead of default gateway for remote network access to
the service port.
Dynamic interfaces, which are also known as VLAN interfaces, are
used to define VLANs for WLAN clients. A WLAN controller can
support up to 512 dynamic interfaces (VLANs).
- If a WLAN controller in appliance mode fails, its dropped access points will poll the network for
another WLAN controller. Another online WLAN controller’s management interface that listens
to the network for AP polling messages will auto-discover, re-associate, and communicate with
as many access points as it can.
- The Cisco Wireless Mesh networking architecture is decentralized where each node only needs
to transmit as far as to the next nearest node. Wireless nodes act as repeaters to transmit data
from nearly nodes to peers that are too far away or impractical for a wired deployment – network
solution for networks that span a really large distance, as well as over rough or difficult terrains.
- Mesh networks are extremely reliable where nodes are connected with many redundant
connections between nodes. If a node is out of service due to hardware or software failure, its
neighbors can simply find another route – self-healing. Extra capacity and higher fault tolerance
can be achieved by adding more nodes.
WLAN
Controller
Wireless
Backhaul
Switch RAP
(Mesh Controller)
Figure 25-6: Cisco Wireless Mesh Networking Architecture
- Figure 25-6 shows a typical mesh network deployment – a RAP connected to the infrastructure,
and the MAPs connect to each other as well as the WLAN controller through the RAP.
- Backhaul interface is the 5GHz 802.11a protocol used to route packets between access points.
Ex: A MAP/PAP serves wireless clients on the 2.4GHz 802.11b wireless protocol but routes the
packets to its parent (RAP) on the 5GHz 802.11a band.
180
MAP
Wireless
Backhaul
Wireless
Backhaul
MAP
Copyright © 2008 Yap Chin Hoong
yapchinhoong@hotmail.com