18-12
Troubleshooting
Unusual Network Activity
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If the monitor port is not a member of the same VLAN as the traffic from
the monitored ports, traffic from the monitored ports does not go out the
monitor port.
None of the devices assigned to one or more VLANs on an 802.1Q-
compliant switch are being recognized.
If multiple VLANs are being used
on ports connecting 802.1Q-compliant devices, inconsistent VLAN IDs may
have been assigned to one or more VLANs. For a given VLAN, the same VLAN
ID must be used on all connected 802.1Q-compliant devices.
Link Configured for Multiple VLANs Does Not Support Traffic for One
or More VLANs.
One or more VLANs may not be properly configured as
“Tagged” or “Untagged”. A VLAN assigned to a port connecting two 802.1Q-
compliant devices must be configured the same on both ports. For example,
VLAN_1 and VLAN_2 use the same link between switch “X” and switch “Y”.
Figure 18-1. Example of Correct VLAN Port Assignments on a Link
1.
If VLAN_1 (VID=1) is configured as “Untagged” on port 3 on switch “X”,
then it must also be configured as “Untagged” on port 7 on switch “Y”.
Make sure that the VLAN ID (VID) is the same on both switches.
2.
Similarly, if VLAN_2 (VID=2) is configured as “Tagged on the link port on
switch “A”, then it must also be configured as “Tagged” on the link port
on switch “B”. Make sure that the VLAN ID (VID) is the same on both
switches.
Duplicate MAC Addresses Across VLANs.
The Switch 4108GL operates
with multiple forwarding databases. Thus, duplicate MAC addresses occuring
on different VLANs can appear where a device having one MAC address is a
member of more than one 802.1Q VLAN, and the switch port to which the
device is linked is using VLANs (instead of STP or trunking) to establish
Switch “Y”
Switch “X”
Link supporting VLAN_1
and VLAN_2
VLAN Port Assignment
Port VLAN_1 VLAN_2
X-3 Untagged Tagged
Port X-3
Port Y- 7
VLAN Port Assignment
Port VLAN_1 VLAN_2
Y-7 Untagged Tagged
Summary of Contents for ProCurve 4108gl Bundle
Page 1: ...hp procurve switch 4108gl management and configuration guide www hp com go hpprocurve ...
Page 2: ......
Page 40: ...2 16 Using the Menu Interface Where To Go From Here Using the Menu Interface ...
Page 154: ...8 24 Time Protocols SNTP Messages in the Event Log Time Protocols ...
Page 350: ...14 44 Port Based Virtual LANs VLANs and GVRP GVRP Port Based Virtual LANs VLANs and GVRP ...
Page 383: ...16 13 Spanning Tree Protocol STP How STP Operates Spanning Tree Protocol STP ...
Page 384: ...16 14 Spanning Tree Protocol STP How STP Operates Spanning Tree Protocol STP ...
Page 442: ...18 30 Troubleshooting Restoring a Flash Image Troubleshooting ...
Page 466: ...B 6 MAC Address Management Determining MAC Addresses MAC Address Management ...
Page 470: ......
Page 481: ...Index 11 Index write memory effect on menu interface 2 13 X Xmodem OS download A 6 ...
Page 482: ......