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Device Configuration

ORiNOCO® 802.11n Access Points - Software Management Guide 32

Link Integrity Table - Add Row

To enable link integrity on the AP device, atleast one entry should be added to the Link Integrity Server Configuration

Tab l e. To add an entry, do the following:

1. Click Add in the link integrity screen, the Link Integrity Table - Add Row screen appears:

Figure 5-5 Link Integrity Table - Add Row

2. Configure all the parameters and click Add, to save the added entry.

• A maximum of five servers can be added.

• Atleast one server should be added to the table, to enable the link integrity feature on the device.

5.2.3 Spanning Tree Protocol (STP)

The Spanning Tree Protocol (STP) helps to avoid bridged loops in a wireless network and ensures a loop-free topology for

bridged LAN (connected on both Wireless and Ethernet interface). Following is the step-by-step procedure on how STP

feature works:

a. Disable: In this state, STP is disabled and no traffic is allowed through Wireless and Ethernet interfaces of the bridged

LAN.

b. Listening: When STP is enabled, the AP devices exchange Bridge Protocol Data Unit (BPDU) packets in listening state.

These BPDU packets contain Bridge Priority and MAC Address information, based on which a Root bridge and

Designated Bridge are selected.

• Root Bridge: It is the device that has the lowest MAC Address or highest priority. Based on a Root Bridge, the

shortest low cost path is selected and alternate high cost paths are blocked, therefore avoiding loops on the

network. Root Bridge transmits the network topology information continuously to other bridges on the

network.

• Designated Bridge: It is the device closest to the Root Bridge and is responsible for forwarding the data

towards the root port of the root bridge. Designated Bridge determines the shortest low cost path to the

destination, via root port. All the other devices in the network other than Root Bridge, act as Designated

Bridge.

c. Learning: Once the Root Bridge and Designated Bridge are selected, all the devices learn and update the Bridge

Priority and MAC address information in their learn table. Designated Bridge determines the shortest low cost path to

via root port, to forward the packets to the destination.

d. Blocking: After selecting the low cost path, the device blocks and disables all the other high cost paths active on

other interfaces. Once the path is blocked, no traffic is allowed via that high cost path.

e. Forwarding: The device easily forwards the data packet to the destination via single low cost path selected, with zero

loops and interference on the bridged network.

: The state of the port must change from blocking state to listening and learning state, before it can change to

the forwarding state.

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