User manual TRENDNET TE100-S55

[. . . ] ProXpress TM Multifunction Switch/Router Model TE100-S55 for connecting 10Base-T, 100Base-TX, 100Base-FX and ISDN links User's Guide First Edition - June 1, 1996 Trademarks Copyright 1996 TRENDware All rights reserved, contents may be revised without prior notice. TRENDnet is a registered trademark of TRENDware Ethernet is a trademark of Xerox Corporation. Microsoft Windows is a trademark of Microsoft Corporation. VT100 is a trademark of Digital Equipment Corporation. [. . . ] Root Path Cost: From each bridge, Root Path Cost is the total Path Cost of reaching the Root Bridge from a Designated Bridge. Designated Bridge: From each LAN segment, the bridge that has the lowest Root Path Cost to the Root Bridge becomes the Designated Bridge. It forwards data packets for that LAN segment. In case all bridges on a segment have the same Root Path Cost, the bridge with the lowest Bridge Identifier becomes the Designated Bridge. 1 The bridge MAC address is only used to decide the Root Bridge when there are 2 or more bridges with the same Bridge Priority. 29 AT THE PORT LEVEL Designated Port: This is the port on each Designated Bridge that forwards data packets for the attached LAN segment. Root Port: Each bridge has a Root Port that has the lowest Path Cost to the Root Bridge. In case there are several ports with the same Path Cost, the one with the lowest Port Identifier (Port Priority + pre-assigned Port ID) becomes the Root Port1. Port Priority: This is a user changeable parameter for each port on the bridge. In conjunction with a pre-set port ID, this parameter determines the Root Port of a Bridge. Path Cost: This parameter is fixed2 and will not be shown. The 100Mb segments will have auto-assigned Path Cost of 10, while the 10Mb segments will have auto-assigned Path Cost of 100. 1 2 In a bridge, a port is Blocked, if it is not a Root or a Designated Port. This is a changeable parameter, based on the STA specification. However, it is fixed by the TE100-S55 implementation. 30 TIMERS Max. Age Time: This is a user changeable parameter. Should a Bridge fail to receive an identifier packet from its Root Bridge within this time limit, it assumes that the Root Bridge has failed. Therefore, a new Root Bridge will be established for the network. Hello Time: This is a user changeable parameter. Should a Bridge be assigned as a Root Bridge, the Hello Time setting will be used as the interval to send out identifier packets to notify other Bridges of its existence. The Hello Time must be less than the Max. Age Time, or else a configuration error will occur. Forward Delay: This is a user changeable parameter. This is the delay time that each port on a Bridge waits in the Listening state before changing its Blocking state to the Forwarding state. 31 ILLUSTRATION OF STA A simple illustration of three Bridges (or TE100-S55) connected in a loop is depicted in Figure 3-2. In this example, you can anticipate some major network problems if the STA assistance is not applied. [. . . ] 27, 29, 30, 45 Port Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Port Physical setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25, 45 Port Priority. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28, 30, 39 Port State. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24, 25, 35, 44, 45 Port Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ]