IBM 8275 User Manual

Contents

802.3x Flow ControlThe 8275-416 supports the 802.3x flow control, which, when enabled allows thetransmission of data frames to be inhibited for a specified period of time. Thedefault for 802.3x flow control isDisabled. 802.3x flow control is valid only when theport is in full duplex mode.Broadcast Storm RecoveryThe 8275-416 detects broadcast storms and automatically blocks broadcast trafficto minimize the impact of the broadcast storm on the rest of the network. You canenable or disable this function at a switch level. If broadcast storm recovery isenabled, each port will monitor incoming broadcast traffic. If the broadcast trafficexceeds 20 percent of the port speed, the broadcast traffic on this port is blockeduntil the broadcast traffic returns to 20 percent or below port speed. The default forbroadcast storm recovery isDisabled.Address AgingAn address recognized by the switch is removed from the port lookup tables after aperiod of time if no frames have been received from that address. The default valuefor the aging period is 300 seconds (5 minutes), but it can be changed by the user.The time values range from 10 seconds to 1000000 seconds.If a port lookup table is full and a frame is received with a new address that needsto be added to the table, the frame is sent multicast.Management and User InterfacesThe network administrator has a choice of these easy-to-use managementmethods:v A VT100 terminal interface allows the network administrator to fully manage the8275-416 using a standard terminal or terminal emulator connected over thenetwork using Telnet or connected to the 8275-416 ’s serial port (EIA 232).“Chapter 2. Accessing the 8275-416” on page 11 describes how to access the8275-416 using this interface and “Chapter 4. Using the Terminal Interface” onpage 25 instructs you about using this interface.v A Web-based interface enables you to manage the 8275-416 through standardWeb browsers. There must be a physical path between the Web browser and the8275-416 over the Ethernet network to use this method of connectivity.“Chapter 2. Accessing the 8275-416” on page 11 describes how to access the8275-416 using this interface and “Chapter 5. Using the Web Interface” onpage 61 instructs you about using this interface.v The 8275-416 has a Simple Network Management Protocol (SNMP) agent thatthe network administrator can access with a standard Network Manager. Thefollowing MIBs (Management Information Base) are supported:– MIB II (RFC 1213)– 8275-416 Enterprise MIB– RMON MIB (RFC 1757)– Bridge MIB (RFC 1493)– IEEE 802.3 Ethernet (RFC 1643)v 8275-416 interoperates with the following SNMP Managers:– Any standard MIB Browser (SNMP V1)2 8275-416 User’s Guide