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Using the Switch C-5
You are trying to manage the Switch over a
network which has STP, and you are losing con-
tact with the management agent intermittently.
As shown in Figure C-1
, there is a SuperStack
®
II
Switch unit (Switch A) between your management
workstation and the Switch 3000 TX (Switch B). You
have configured more than one VLAN on both
Switch units, and there is a parallel STP path for
each VLAN between the Switch units.
When Switch B transmits BPDUs across a VLAN
other than VLAN 1, Switch A learns the MAC
address of Switch B through the port on that
VLAN. The management agent of Switch B is only
accessible through VLAN 1, and so your manage-
ment workstation cannot communicate with Switch
B until it transmits BPDUs across VLAN 1. When that
occurs, Switch A learns the MAC address of Switch
B through the port on VLAN 1.
To avoid this situation, we recommend that you
connect the two SuperStack II Switch units using a
Virtual LAN Trunk (VLT). For more information
about VLTs, refer to “
Connecting Common VLANs
Between Switch Units” on page 5-3.
Figure C-1
Network configuration that results in loss of contact