port speed - 10/100 mbps utp
you can select the desired speed and duplex for each port. possible settings include: auto, 10f, 10h, 100f, and 100h where the number 10 or 100 is the speed in mbps, and the h or f designates half-duplex or full-duplex. choosing auto enables nway autonegotiation to automatically configure the port speed to match the highest speed attainable by the device being connected. the port speed default setting is auto.
port speed ¨c gigabit ethernet ports
1000base-sx fiber ports can operate in 1000 mbps full-duplex (1000f) only.
1000base-t ports offer four possible settings: auto, 100h, 100f, and 1000f.
when auto is chosen, nway will negotiate three settings:
·speed - 100/1000 (100 mbps connections are attainable for hardware version a2 only)
·duplex - full/half (half-duplex mode is only available for 100 mbps connections in hardware version a2 only)
·ieee 802.3x flow control ¨c enable/disable
the hardware version (a1 or a2) can be found in the lower right-hand corner of the management console screen.
flow control
toggles flow control enable or disable. it is useful during periods of heavy network activity when the switch's buffers can receive too much traffic and fill up faster than the switch can forward the information. in such cases, the switch will intervene and tell the transmitting device to pause to allow the information in the port buffer to be sent. the flow control default setting is enable.
port trunk groups
the switch supports the use of port trunk groups. each trunk group may contain 2 to 4 ports as members for a potential bit rate of up to 800 mbps per trunk group. see the discussion of port trunk groups in chapter 6 for more detailed information about port trunk groups.
port monitor
allows you to select a port to monitor activity for analysis. the monitored port will mirror all activity to the monitoring port. this feature is useful for analyzing traffic in ports where acute traffic congestion or other problems may exist.
priority queues
this feature allows you to customize packet traffic handling to the particular needs of your network. configure this setting for packets passing through the port, using ieee 802.1p priority tagging. these settings are universal, that is, they are for all ports on the switch. four priority levels may be assigned with queue 3 being the highest priority queue, and queue 0 being the lowest priority queue.
the settings you assign to the queues, numbers 0-7, represent the ieee 802.1p priority tag number. do not confuse these settings with port numbers.
the highest priority queue, queue 3, should reserved for data in which latency can have adverse affects on the function of an application, such as video or audio data, where latency can produce distorted sounds and images. packets in the lower priority queues will be processed with less urgency. see the discussion on ieee 802.1p priority and management of priority queues in chapter 6.
figure 5-2 shows how priority queues might be assigned. access the priority queue settings on the second page of the console management screen
vlan group
up to 9 port-based virtual lan (vlan) groups can be designated for the switch.
individual ports can exist in two or more vlans simultaneously, so vlan groups can overlap or intersect. for a more detailed discussion of vlans, see chapter 6.
using the space bar, select each port that you would like to be included in the assigned vlan. a "v" under the port number indicates the port is in the designated vlan group.
figure 5-3 gives an example of different vlans assigned to different ports. notice that a port may be a member of more than one vlan.
in order to use vlan segmentation in conjunction with port trunk groups, you must first set the port trunk group(s), and then you may configure vlan settings. if you wish to change the port trunk grouping with vlans already in place, you will need to reconfigure the vlan settings after changing the port trunk group settings.