HP 2610-PWR - Manual (Page 40)

Static Virtual LANs (VLANs)
Port-Based Virtual LANs (Static VLANs)
The Solution. To avoid the preceding problem, use only one cable or port
trunk between the single-forwarding and multiple-forwarding database
devices, and configure the link with multiple, tagged VLANs.
Switch 8000M
VLAN 1 VLAN 2
Multiple-Forwarding
Database Switch
(Routing Enabled)
VLAN 1 VLAN 2
This switch has multiple
forwarding databases.
This switch has a single
forwarding database.
PC “A” PC “B”
VLAN
1 & 2
VLAN
1 & 2
A1
C1
Figure 2-9. Example of a Solution for Single-Forwarding to Multiple-Forwarding
Database Devices in a Multiple VLAN Environment
Now, the 8000M forwarding database always lists the multiple-forwarding
database switch MAC address on port A1, and the 8000M will send traffic to
either VLAN on the multiple-forwarding database switch.
To increase the network bandwidth of the connection between the devices,
you can use a trunk of multiple physical links rather than a single physical link.
Multiple-Forwarding Database Operation
If you want to connect a switch covered by this guide to another switch that
has a multiple-forwarding database, you can use either or both of the following
connection options:
■ A separate port or port trunk interface for each VLAN. This results in a
forwarding database having multiple instances of the same MAC address
with different VLAN IDs and port numbers. (See table 2-6.) The switches
covered by this guide that use the same MAC address on all VLAN
interfaces cause no problems.
■ The same port or port trunk interface for multiple (tagged) VLANs. This
results in a forwarding database having multiple instances of the same
MAC address with different VLAN IDs, but the same port number.
Allowing multiple entries of the same MAC address on different VLANs
enables topologies such as the following:
2-14