Cabletron Systems SPECTRUM, Руководство пользователя

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Accessing the Bridge Traffic View Window 6-7
Using the 7C0x SmartSwitch Bridge View
The Frames display mode shows the following Bridge Port information:
• Frms In —Displays the total number of frames, including BPDU frames,
received at this bridge port from its attached network segment during the last
polling interval.
• Frms Out —Displays the total number of frames, including BPDU frames,
transmitted or forwarded through this port to its attached network segment
during the last polling interval.
• Forwarded —Displays frames forwarded by this bridge port to another bridge
port on the device during the last polling interval. You can change this display
using the Delta/Percentage button (described in this section). When Delta is
selected, this field displays the total number of frames forwarded by this
bridge port to another port on the bridge during the last polling interval. When
Percentage
is selected, this field displays the percentage of all frames received
by the port from its network segment that were forwarded to another port on
the bridge during the last polling interval.
When the Admin option is selected, the Bridge Port boxes display port Status
—whether the port is enabled or disabled — and port State.
Enabled The port is able to participate in bridging and the
Spanning Tree Algorithm.
Disabled The port cannot participate in bridging or Spanning Tree
operations.
A port’s State indicates whether or not the port is forwarding packets and
participating in the exchange of BPDUs. The Spanning Tree Algorithm determines
the state of each port in order to maintain an active topology with no data loops.
As a port moves from the blocking to the forwarding state, it will remain in each
state for the duration of the Forward Delay in order to prevent data loops while
the active topology is changing. Possible port states are as follows:
Disabled The port has been disabled by management; it cannot
receive or forward traffic, and is not participating in the
exchange of BPDUs.
Blocking This port is not forwarding or receiving traffic (and
therefore no physical address information is added to the
Filtering Database), but it will still send out and receive
BPDUs. A port will enter the blocking state for two
reasons: if it receives information that another bridge is
the designated bridge to the network segment to which
this port is attached, or immediately after it has been
enabled by management.
Listening This state is entered from the blocking state when the
STA determines that this port should participate in frame
relay. The port is processing BPDUs, but is not yet
forwarding or receiving traffic or adding information to
the Filtering Database.