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| Chapter 7 Basic Setting |
| Table 12 Basic Setting > Port Setup (continued) | |
| LABEL | DESCRIPTION |
| Flow Control | A concentration of traffic on a port decreases port bandwidth and overflows buffer |
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| memory causing packet discards and frame losses. Flow Control is used to regulate |
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| transmission of signals to match the bandwidth of the receiving port. |
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| The Switch uses IEEE802.3x flow control in full duplex mode and backpressure flow |
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| control in half duplex mode. |
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| IEEE802.3x flow control is used in full duplex mode to send a pause signal to the |
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| sending port, causing it to temporarily stop sending signals when the receiving port |
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| memory buffers fill. |
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| Back Pressure flow control is typically used in half duplex mode to send a "collision" |
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| signal to the sending port (mimicking a state of packet collision) causing the sending |
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| port to temporarily stop sending signals and resend later. Select Flow Control to |
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| enable it. |
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| 802.1p Priority | This priority value is added to incoming frames without a (802.1p) priority queue tag. |
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| See Priority Queue Assignment in Table 10 on page 82 for more information. |
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| BPDU Control | Configure the way to treat BPDUs received on this port. You must activate bridging |
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| control protocol transparency in the Switch Setup screen first. |
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| Select Peer to process any BPDU (Bridge Protocol Data Units) received on this port. |
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| Select Tunnel to forward BPDUs received on this port. |
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| Select Discard to drop any BPDU received on this port. |
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| Select Network to process a BPDU with no VLAN tag and forward a tagged BPDU. |
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| Apply | Click Apply to save your changes to the Switch’s |
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| these changes if it is turned off or loses power, so use the Save link on the top |
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| navigation panel to save your changes to the |
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| configuring. |
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| Cancel | Click Cancel to begin configuring this screen afresh. |
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| 87 |
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