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NB-30 Bridging
3-12 Bridge Statistics
Out of Window Coll. (Ethernet Port Only)
The number of collisions at this port that were out of the standard collision
window (51.2µs) due to a network problem experienced by the bridge. The
problem may be that the network length exceeds speciÞcations, or that a node is
transmitting without listening for carrier sense.
CRC Errors
The total number of frames received by the port that had Cyclical Redundancy
Check (CRC) errors. A CRC error indicates the packet was damaged in transit Ñ
since a frame check sequence of the packet does not match that recorded in the
frame by the transmitting station.
Frame Alignments
The number of frames received by the port from the network that were
misaligned Ñ that is, in which a byte of data in the packet contained less than 8
bits. This may indicate a packet formation problem on the part of a node, a
problem of interference with the cabling, or a network design with cascaded
multi-port transceivers (which does not meet IEEE 802.3 speciÞcations).
Giant Packets (Ethernet Port Only)
The number of giant frames the Ethernet port has received from the network. A
giant frame exceeds the maximum Ethernet frame size of 1518 bytes (excluding
the preamble).
Timeout (Remote Port Only)
The number of frames that were discarded because the maximum time for
forwarding was exceeded before it could be transmitted by the remote port.
Total Errors
The total number of any errors processed by the selected port.
Nothing
The selected scale is not currently in use.
Configuring Performance Graphs
To conÞgure the Bridge Performance Graph:
1. Using the mouse, click on a scale button. A menu will appear.
For the Bridge Performance Graph, Frames Forwarded appears next to the
blue scale by default; Frames Received appears next to the red scale.
For the Ethernet Port Performance Graph, Collisions appears next to the
blue scale by default; Frames Received appears next to the red scale.
For the Remote Port Performance Graph, Forwarded Outbound appears
next to the blue scale by default; Frames Received appears next to the red
scale.