Thanks very much Lou! I think that covered all my questions about how it's supposed to work.
Thanks again! Cristiano Rodrigues Técnico de Informática Sistemas e Tecnologias de Informação [email protected] - Rua do Repouso, n10, 8000-302 Faro T: +351 289 899 070 F: +351 289 899 079 W: http://www.aguasdoalgarve.pt -------------------------------------------------------------------- * Antes de imprimir este e-mail pense bem se tem mesmo de o fazer. * * Before printing this e-mail, assess if it is really needed. * -------------------------------------------------------------------- -----Original Message----- From: Lou H. Goddard [mailto:[email protected]] Sent: quinta-feira, 22 de Julho de 2010 17:58 To: Enterasys Customer Mailing List Subject: RE: [enterasys] RoamAbout 4102 - Wireless Bridge Howto I pulled this out the of on-line help from the 4102: WDS & STP Each access point radio interface can be configured to operate in a bridge mode, which allows it to forward traffic directly to other access point units. To set up bridge links between access point units, you must configure the Wireless Distribution System (WDS) forwarding table by specifying the wireless MAC address of all units to which you want to forward traffic. Up to six WDS bridge or repeater links can be specified for each unit in the wireless bridge network. The Spanning Tree Protocol (STP) can be used to detect and disable network loops, and to provide backup links between bridges. This allows a wireless bridge to interact with other bridging devices (that is, an STP-compliant switch, bridge or router) in your network to ensure that only one route exists between any two stations on the network, and provide backup links which automatically take over when a primary link goes down. WDS Settings: Bridge Role allows you to set each radio interface to operate in one of the following modes: AP (Access Point) configures the AP to communicate with wireless clients only, providing connectivity to a wired LAN. Bridge configures the AP to a LAN-to-LAN mode as a bridge to other access points. The "Parent" link to the root bridge must be configured. Up to five other "Child" links are available to other bridges.Root-Bridge configures the AP to operate as the root bridge in the wireless bridge network. Up to six other "Child" links are available to other bridges in the network. Channel Auto Sync allows the AP in the Bridge mode (the “Child” AP) to automatically reconnect with its “Parent” AP (or the Root-Bridge) in the event that either the “Child” or the “Parent” AP’s channel is changed. Default: Disabled. Bridge Parent is the physical layer address of the root bridge, or the AP connected to the root bridge. Enter the MAC address in the form: 12 hexadecimal digits (xx-xx-xx-xx-xx-xx). Bridge Child (1-8) is the physical layer address of other AP's that connected to the root bridge. Enter the MAC address of each remote AP that is will be connected in the LAN-to-LAN environment. IMPORTANT: WDS is only supported with the following authentication methods: Open, WEP and WPA w/AES. Spanning Tree Protocol Settings: The AP4102 uses 802.1d Spanning Tree Protocol to prevent network loops. A loop can cause bridges to continually forward multicast traffic and degrade network performance. In a point-to-multipoint configuration it is suggested to enable Spanning Tree. The AP Spanning Tree function corrects loops by shutting down the port and possibly shutting down a segment of the network. Bridge: Enables or disables the Spanning Tree Protocol on the wireless bridge. Default: Disable.Bridge Priority: (1-65535) Selects the root device, root port, and designated port. The AP with the highest priority becomes the STP root AP. However, if all AP's have the same priority, the AP with the lowest MAC address will then become the root device. Default: 32769 Note: Lower numeric values indicate higher priority. Bridge Max Age: (6-40) The maximum time (in seconds) a device can wait without receiving a configuration message before attempting to reconfigure. All device ports (except for designated ports) should receive configuration messages at regular intervals. Any port that ages out STP information (provided in the last configuration message) becomes the designated port for the attached LAN. If it is a root port, a new root port is selected from among the device ports attached to the network. Default: 20 Minimum: The higher of 6 or [2 x (Hello Time + 1)].Maximum: The lower of 40 or [2 x (Forward Delay - 1) Bridge Hello Time: (1-10) The interval, in seconds, at which the root bridge transmits a configuration message. · Default: 2 · Minimum: 1 · Maximum: The lower of 10 or [(Max. Message Age / 2) -1] Bridge Forwarding Delay: (4-30) The maximum time (in seconds) this device waits before changing states (for example., discarding to learning to forwarding). This delay is required because every device must receive information about topology changes before it starts to forward frames. In addition, each port needs time to listen for conflicting information that would make it return to a discarding state; otherwise, temporary data loops might result. · Default: 15 · Minimum: The higher of 4 or [(Max. Message Age / 2) + 1] · Maximum: 30 802.11a/g/b and Ethernet Interface Settings: Link Path Cost: (1-65535) Used by STP to determine the best path between devices. Therefore, lower values should be assigned to ports attached to faster media, and higher values assigned to ports with slower media. (Path cost takes precedence over port priority.) · Range: 1-65535 · Default: Ethernet interface: 19; Wireless interface: 40 Link Port Priority: (0-255) Defines the priority used for this port in the Spanning Tree Protocol. If the path cost for all ports on a switch are the same, the port with the highest priority (for example, lowest value) will be configured as an active link in the spanning tree. This makes a port with higher priority less likely to be blocked if the Spanning Tree Protocol is detecting network loops. Where more than one port is assigned the highest priority, the port with lowest numeric identifier will be enabled. · Default: 128 · Range: 0-255, in steps of 16 Thanks, Lou Goddard Network Engineer 302-552-8053 [email protected] ----- Original Message ----- From: Richard Applebee <[email protected]> Sent: Thu, 7/22/2010 11:16am To: Enterasys Customer Mailing List <[email protected]> Subject: re:[enterasys] RoamAbout 4102 - Wireless Bridge Howto Hi Cristiano - We have never set them up as a backup link (and do not think they have that functionality) but we use them as Wireless Distribution System (WDS) links to buildings that we have a line of site to but no physical pathways. You could tune Spanning Tree to prefer your optical link over the WDS link. Richard --- To unsubscribe from enterasys, send email to [email protected] with the body: unsubscribe enterasys [email protected] ------------------ CONFIDENTIALITY NOTICE --------------- This message, including any attachments, is for the sole use of the intended recipient(s) and may contain privileged confidential information protected by law. Any unauthorized review, use, disclosure or distribution of this message is prohibited. 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