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11-6 CHAPTER 11: ADMINISTERING BRIDGE PORTS
Frame Processing and
Bridge Port Statistics
All frames received on a physical (Ethernet or FDDI) interface and not
explicitly directed to the Switch 2200 are delivered to the corresponding
bridge port. A frame is then either forwarded to another bridge port or
discarded. A frame might be discarded for the following reasons:
■ The destination station is on the same segment as the source station.
■ The receive bridge port is blocked.
■ There is some problem with the frame.
■ A user-defined packet filter indicated that the frame should not be
forwarded.
Figure 11-1 shows the order in which the discard decisions are made.
Figure 11-1 How Frame Processing Affects Receive Bridge Port Statistics
A frame forwarded to a bridge port is transmitted onto a physical interface
unless it is discarded. A frame might be discarded for the following reasons:
■ The transmit bridge port is blocked.
■ The frame is too large for the corresponding physical interface.
■ A user-defined packet filter indicated that the frame should not be
forwarded.
r
xFrames
s
ameSegDiscs
r
xBlockedDiscs
r
xSecurityDiscs
r
xErrorDiscs
r
xOtherDiscs
r
xMcastFilters
r
xAllFilters
r
xForwardUcasts
r
xFloodUcasts
r
xForwardMcasts
Frames received on this bridge port
Frames discarded because frame not valid for
bridging
Frames forwarded by this bridge port
processing of frames
R
eceive Bridge Port Statistics
from Physical
Interface
=
Frames discarded because of user-defined
packet filter
Frames discarded because source and
destination stations on same segment
Frames discarded because receive bridge port
blocked