2-10
Static Virtual LANs (VLANs)
Port-Based Virtual LANs (Static VLANs)
showing the (different) source VLAN and source port. Other switch models
have a single-forwarding database, which means they allow only one data-
base entry of a unique MAC address, along with the source VLAN and source
port on which it is found (see Table 2-6). Not all VLANs on a switch covered
by this guide use the same MAC address (see “VLAN MAC Addresses” on page
2-38). Connecting multiple-forwarding database switch to a single-forwarding
database switch where multiple VLANs exist imposes some cabling and port
VLAN assignment restrictions. Table 2-6 illustrates the functional difference
between the two database types.
Table 2-6. Example of Forwarding Database Content
Table 2-7 lists the database structure of current ProCurve switch models.
Table 2-7. Forwarding Database Structure for Managed ProCurve Switches
Multiple-Forwarding Database Single-Forwarding Database
MAC Address Destination
VLAN ID
Destination
Port
MAC Address Destination
VLAN ID
Destination
Port
0004ea-84d9f4 1 5 0004ea-84d9f4 100 9
0004ea-84d9f4 22 12 0060b0-880af9 105 10
0004ea-84d9f4 44 20 0060b0-880a81 107 17
0060b0-880a81 33 20
This database allows multiple destinations
for the same MAC address. If the switch
detects a new destination for an existing
MAC entry, it just adds a new instance of that
MAC to the table.
This database allows only one destination
for a MAC address. If the switch detects a
new destination for an existing MAC entry,
it replaces the existing MAC instance with
a new instance showing the new
destination.
Multiple Forwarding Databases* Single Forwarding Database*
Switch 8212zl Switch 1600M/2400M/2424M
Series 6400cl switches Switch 4000M/8000M
Switch 6200yl Series 2500 switches
Switch 6108 Switch 2000
Series 5400zl switches Switch 800T
Series 5300xl switches
Series 4200vl switches
Series 4100gl switches
Series 3500yl switches
Series 3400cl switches
