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460T Ch2.p65
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Intel Express 460T Standalone Switch Users Guide
On the 460T switch, overlapping VLANs can be supported through the use
of 802.1Q-capable devices. However, for non-802.1Q-capable devices,
overlapping VLANs can be supported by implementing an asymmetric
VLAN on the switch (see references below for more information). An
asymmetric VLAN is a type of 802.1Q configuration where endstations
send traffic on one VLAN and receive traffic on another VLAN. The 460T
switch is capable of supporting asymmetric VLANs.
To learn more about asymmetric VLANs, see http://support.intel.com/
support or refer to IEEE 802.1Q Specification Annex B.1.3.
Spanning Tree and VLANs
The Express 460T supports the Spanning Tree Protocol across the entire
switch, not per VLAN. If a loop occurs in a VLAN the port is disabled and
all VLAN traffic over that port is blocked.
A good example of this can be seen below. Both Switch 1 and Switch 2 have
two port-based VLANs configured. Crossover cables connect the
ENG_VLAN on Switch 1 to ENG_VLAN on and Switch 2. Crossover
cables also connect the MRKT_VLAN on Switch 1 to the MRKT_VLAN
on Switch 2. When Spanning Tree is enabled, the redundant link between
the MRKT_VLANs is blocked and those VLANs can no longer
communicate.
When the switch is running 802.1Q VLANs, Spanning Tree is required for
GVRP to work properly.
Intel
MDI
Switch 1
MDI-X
Intel
Switch 2
MDI
MDI-X
20
Module A
®
Port 1
Port 2
Express 460T Standalone Switch
Status
Link\Act\Coll
Link\Act\Coll
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
ENG_VLAN
ports 1-8
crossover
connecting ENG_VLANs
Module A
®
Port 1
Port 2
Express 460T Standalone Switch
Status
Link\Act\Coll
Link\Act\Coll
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
ENG_VLAN
ports 1-8
4/19/00, 4:10 PM
Status
Left
20
21
22
23
24
Link = Solid Green
Activity = Blinking Green
Collision = Blinking Orange
Right
10Mbps = Solid Orange
100Mbps = Off
MKT_VLAN
ports 17-24
Spanning Tree disables
the redundant crossover
breaking the connection
between the MKT_VLANs.
Status
Left
20
21
22
23
24
Link = Solid Green
Activity = Blinking Green
Collision = Blinking Orange
Right
10Mbps = Solid Orange
100Mbps = Off
MKT_VLAN
ports 17-24
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