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PowerConnect B-Series FCX Configuration Guide 1301
53-1002266-01
Example configurations
36
The mac-authentication disable-ingress-filtering command enables tagged packets on the port,
even if the port is not a member of the VLAN. If this feature is not enabled, authentication works as
in “Example 2”
Example 2
Figure 162 illustrates multi-device port authentication with dynamic VLAN assignment on a Dell
PowerConnect device. In this configuration, a PC and an IP phone are connected to a hub, which is
connected to port e1 on a Dell PowerConnect device. Port e1 is configured as a dual-mode port.
Also, mac-authentication disable-ingress-filtering is enabled on the port. The profile for the PC MAC
address on the RADIUS server specifies that the PC should be dynamically assigned to VLAN 102,
and the RADIUS profile for the IP phone specifies that it should be dynamically assigned to VLAN 3.
FIGURE 162 Using multi-device port authentication with dynamic VLAN assignment
In this example, multi-device port authentication is performed for both devices. If the PC is
successfully authenticated, dual-mode port e1 PVID is changed from the VLAN 1 (the
DEFAULT-VLAN) to VLAN 102. If authentication for the PC fails, then the PC can be placed in a
specified “restricted” VLAN, or traffic from the PC can be blocked in hardware. In this example, if
authentication for the PC fails, the PC would be placed in VLAN 1023, the restricted VLAN.
If authentication for the IP phone is successful, then dual-mode port e1 is added to VLAN 3. If
authentication for the IP phone fails, then traffic from the IP phone would be blocked in hardware.
(Devices sending tagged traffic cannot be placed in the restricted VLAN.)
NOTE
This example assumes that the IP phone initially transmits untagged packets (for example, CDP or
DHCP packets), which trigger the authentication process on the Dell PowerConnect device and client
lookup on the RADIUS server. If the phone sends only tagged packets and the port (e1) is not a
member of that VLAN, authentication would not occur. In this case, port e1 must be added to that
VLAN prior to authentication.
Hub
Switch
Port e1
Dual Mode
Hub
Untagged
Tagged
RADIUS Server
Tunnel-Private-Group-ID:
User 0002.3f7f.2e0a -> “U:102”
User 0050.048e.86ac -> “T:3”
PC
MAC: 0002.3f7f.2e0a
IP Phone
MAC: 0050.048e.86ac