3Com 3800 - Manual (Page 96)

6-2 C HAPTER 6: S WITCH F ORWARDING D ATABASE (FDB)
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Permanent entries — Permanent entries are retained in the
database if the Switch is reset or a power off/on cycle occurs. The
system administrator must make entries permanent. A permanent
entry can either be a unicast or multicast MAC address. All entries
entered by way of the command-line interface are stored as
permanent. The Switch can support a maximum of 64 permanent
entries.
PACE Prioritization For devices supporting PACE, the Switch 3800 can be configured to
recognize PACE modified addresses. When present, the Switch assigns
PACE traffic to the high priority queue within the Switch.
Recognition of PACE traffic is controlled by the following commands:
enable pace
disable pace
How FDB Entries are
Added
Entries are added into the FDB in two ways:
■
The Switch can learn entries. That is, the Switch updates its FDB
with the source MAC address from a packet, the VLAN, and the
port identifier on which the source packet is received.
■
You can enter and update entries using a MIB browser, an SNMP
Network Manager, or the command-line interface, as described in
the next section.
SW3800.BK Page 2 Tuesday, May 5, 1998 5:20 PM