Operational Problems; Deadlocked Vlan - Alcatel Omni Switch/Router User Manual

Operational Problems

Operational Problems
The following paragraphs describe operational problems you may encounter.

Deadlocked VLAN

Occasionally, a
used when you set up the
If, for example, you have a setup with three switches, as shown in the following figure, the
can enter a deadlock. In this example, there are two switches, one configured with one
VLAN
(Switch X), another configured with two
VLAN
device that connects to the
In this situation,
connected to Switch Y with two virtual bridges (V1 and V3), which are inside one switch.
Since V2 detects a loop, it invokes blocking at the port connected to V1, which results in a
deadlock. V1 and V3, inside Switch Y, can still communicate, and traffic still exits V2 in
Switch X, going to V3; however, traffic will not exit V3.
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may deadlock. This may be a result of the configuration process you
VLAN
.
VLANs
(Switch Z).
VLANs
Switch X has detected a
loop and is blocking on
its port connected to
VLAN 1 (V1).
Switch Y with VLAN No. 1 (V1)
and VLAN No. 3 (V3)
Deadlocked VLANs Due to Loop
2 (V2) in the Switch X is in a loop because it has not learned that it has
VLAN
(Switch Y), and another switching
VLANs
Switch X with VLAN No. 2 (V2)
Switch Z