User manual D-LINK DES-3208

[. . . ] 02 (January, 1998) 6DES3208. . 02 Printed In Taiwan RECYCLABLE Wichtige Sicherheitshinweise 1. Um eine Beschädigung des Gerätes zu vermeiden sollten Sie nur Zubehörteile verwenden, die vom Hersteller zugelassen sind. Verwenden Sie nur sichere Standorte und beachten Sie die Aufstellhinweise des Herstellers. Die Belüftungsöffnungen dienen zur Luftzirkulation die das Gerät vor Überhitzung schützt. [. . . ] The Switch uses the standard MIB-II Management Information Base module. Consequently, MIB values inside the Switch can be retrieved from any SNMP-based network manager. In addition to the standard Switch Management 25 10/100 Fast Ethernet Switch User's Guide MIB-II, the Switch also supports its own proprietary enterprise MIB as an extended Management Information Base. These MIBs may also be retrieved by specifying the MIB's Object-Identity (OID) at the network manager. Read-only MIBs variables can be either constants that are programmed into the Switch, or variables that change while the Switch is in operation. Examples of read-only constants are the number of ports and types of ports. Examples of read-only variables are the statistics counters such as the number of errors that have occurred, or how many kilobytes of data have been received and forwarded through a port. Read-write MIBs are variables usually related to user-customized configurations. Examples of these are the Switch's IP Address, Spanning Tree Algorithm parameters and port status. If you use a third-party vendors' SNMP software to manage the Switch, a diskette listing the Switch's propriety enterprise MIBs can be obtained by request. If your software provides functions to browse or modify MIBs, you can also get the MIB values and change them (if the MIBs' attributes permit the write operation). This process however can be quite involved, since you must know the MIB OIDs and retrieve them one by one. Packet Forwarding The Switch looks at the network configuration to forward packets. This reduces the traffic congestion on the network, because packets, instead of being transmitted to all segments, are transmitted to the destination only. Example: if Port 1 receives a packet destined for Port 2, the Switch transmits that packet through Port 2 only, and transmits nothing through Port 1. A Switch filters frames, i. e. , does not relay frames received by a Switch Port to other Ports on 26 Switch Management 10/100 Fast Ethernet Switch User's Guide that Switch, in order to prevent the duplication of frames. Frames transmitted between a pair of end stations can be confined to LANs that form a path between those end stations. The functions that support the use and maintenance of filtering database information are: 1. Automatic learning of dynamic filtering information through observation of Switched Local Area Network traffic. Calculation and configuration of Switched Local Area Network topology. Aging Time The Aging Time is a parameter that affects the auto-learn process of the Switch in terms of the network configuration. Dynamic Entries, which make up the auto-learned-node address, are aged out of the address table according to the Aging Time that you set. A very long Aging Time can result with the out-of-date Dynamic Entries that may cause incorrect packet filtering/forwarding decisions. In the opposite case, if the Aging Time is too short, many entries may be aged out soon, resulting in a high percentage of received packets whose source addresses cannot be found in the address table. Switch Management 27 10/100 Fast Ethernet Switch User's Guide Spanning Tree Algorithm The Spanning Tree Algorithm (STA) in the Switch allows you to create alternative paths (with multiple switches or other types of bridges) in your network. [. . . ] Straight cable for Switch (uplink MDI-II port) to switch/Hub or other devices connection Figure B-3. Crossover cable for Switch (MDI-X port) to switch/hub or other network devices (MDI-X port) connection RJ-45 Pin Specification 73 10/100 Fast Ethernet Switch User's Guide C 9 MII CONNECTOR SPECIFICATIONS The MII (Media Independent Interface) is a 40 pin connector used for making connection with other LAN networks. This connector has a shared connection with port 2x, and when connected, the MII connection takes operational precedence over port 2x. The following Figure and table show the standard MII 40 pin connector and the pin assignment. Figure C-1. [. . . ]