Figure 1-5. Internal Switch Module; Switch Module - SMC Networks TigerStack II 10/100 User Manual

A H
BOUT THE UBS
Internal Switch Module

Figure 1-5. Internal Switch Module

Located in the top expansion slot of the DS hub models, the
Internal Switch Module interconnects the 10 Mbps and 100 Mbps
segments and employs a buffered store-and-forward architecture to
prevent bad packets from being propagated throughout the
network. It also features a non-blocking design that allows
simultaneous wire-speed transport in both directions at consistently
low latency.
A MAC address table that can hold 4K entries is provided for
learning, filtering and forwarding. Addresses are automatically
learned and maintained in the address table to enable the switch to
perform filtering and forwarding at line-rate speeds. When a
packet is encountered containing a destination address that does
not appear in the table, the packet is broadcast to both segments.
If more than one Internal Switch Module or Extender Switch
Module is in a stack, only the internal switch function
(interconnecting the 10 and 100 Mbps segments) that is in the
module highest in the stack will be active; the internal switch
function in all other modules is disabled automatically. Note that if
the active internal switch function should fail, the stack needs to
be reset for another module's internal switch function to become
active.
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