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This soft copy for use by IBM employees only.
− Support port mirroring (TokenProbe or Etherprobe) whereby one port can
monitor any LAN port for the purposes of connecting a LAN analysis tool
− Support three switching modes to optimize performance:
1. Cut-Through Switching
In this mode, the switch reads in the address portion of the frame
header, makes a forwarding decision strictly based on destination
address, and forwards the header and the remainder of the packet to
the destination port while the packet is still arriving. This optimizes
forwarding performance, but does not filter out bad frames.
2. Store-and-Forward Switching
In this mode, the switch reads the entire packet into a buffer and
performs a full CRC check on it before forwarding good packets to
the destination port. This eliminates bad frames, but with a greater
latency.
3. Adaptive Switching
This feature allows the switch to run in cut-through mode (for high
performance and low latency) until the number of bad packets
received surpasses a user-settable threshold within a given period of
time. It then automatically switches to store-and-forward mode to
avoid propagating bad packets. When the number of bad packets
falls to acceptable levels, the switch reverts automatically to
cut-through mode. The net result is to give the highest possible
performance with the least number of errors.
− Provides a Virtual Switch capability that allows the switch to operate as
though it were actually several (up to 8) switches. That is to say, traffic
arriving on a port can only be forwarded to ports within its group. This
also means that broadcasts are isolated within each virtual switch.
− Support inbound MAC address filtering which allows:
- Blocking of packet based on source or the destination MAC address.
- Forwarding to specific ports based on source MAC address.
- Forcing traffic to specific ports based on the destination MAC
address.
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Token-Ring Features:
− Supports 8 shielded TRN UTP/STP RJ45 lobe ports using either UTP
category 3,4, or 5 cabling, or STP cabling.
Note
These ports do not support RI or RO connections. Use the 2-Port
Fiber RI/RO UFC to handle RI or RO connections.
− Have either two UFC slots (2-slot modules) or four UFC slots (3-slot
modules), which can contain any combination of the following UFCs:
- 4-Port UTP/STP
This UFC adds an additional four switched TRN ports to the module.
•
Interface: RJ45
•
Cabling: STP; UTP categories 3, 4, and 5
72 ATM Workgroup Solutions: Implementing the 8285 ATM Switch