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 2-39). 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

Multiple-Forwarding Database

MAC Address

Destination

Destination

 

VLAN ID

Port

 

 

 

0004ea-84d9f4

1

A5

0004ea-84d9f4

22

A12

0004ea-84d9f4

44

A20

0060b0-880a81

33

A20

Single-Forwarding Database

MAC Address

Destination

Destination

 

VLAN ID

Port

 

 

 

0004ea-84d9f4

100

A9

0060b0-880af9

105

A10

0060b0-880a81

107

A17

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.

Table 2-7 lists the database structure of current ProCurve switch models.

Table 2-7. Forwarding Database Structure for Managed ProCurve Switches

Multiple-Forwarding Databases*

Single-Forwarding Database*

Switch 8200zl

Switch 1600M/2400M/2424M

Switch 6108

Switch 4000M/8000M

Switch 5400zl

Series 2500 switches

Series 5300xl switches

Switch 800T

Series 4100gl switches

Switch 2000

Series 3400cl switches

Switch 800T

Series 2810 switches

Switch 2000

Series 2800 switches

 

Series 2610/2610-PWR switches

 

2-11