3Com SUPERSTACK 2200 User Manual page 129

11-6 C 11: A
HAPTER DMINISTERING
Frame Processing and
Bridge Port Statistics
B P
RIDGE ORTS
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.
Receive Bridge Port Statistics
rxFrames
sameSegDiscs
rxBlockedDiscs
rxSecurityDiscs
rxErrorDiscs
rxOtherDiscs
rxMcastFilters
rxAllFilters
rxForwardUcasts
rxFloodUcasts
rxForwardMcasts
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.
Frames received on this bridge port
Frames discarded because source and
destination stations on same segment
Frames discarded because receive bridge port
blocked
Frames discarded because frame not valid for
bridging
Frames discarded because of user-defined
packet filter
=
Frames forwarded by this bridge port
from Physical
Interface