RTS DV-3400 Informações Técnicas descarregar pdf (Página 517)

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101

Troubleshooting

Unusual Network Activity

Switch “Y”

Switch “X”

Link supporting VLAN_1

and VLAN_2

Port X-3

Port Y- 7

VLAN Port Assignment

Port VLAN_1 VLAN_2

X-3 Untagged Tagged

Y-7 Untagged Tagged

Figure C-9. 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 switches covered by this

guide operate with multiple forwarding databases. Thus, duplicate MAC

addresses occurring 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 redundant links to another switch. If the other device sends traffic

over multiple VLANs, its MAC address will consistently appear in multiple

VLANs on the switch port to which it is linked.

Note that attempting to create redundant paths through the use of VLANs will

cause problems with some switches. One symptom is that a duplicate MAC

address appears in the Port Address Table of one port, and then later appears

on another port. While the switches covered by this guide have multiple

forwarding databases, and thus does not have this problem, some switches

with a single forwarding database for all VLANs may produce the impression

that a connected device is moving among ports because packets with the same

MAC address but different VLANs are received on different ports. You can

avoid this problem by creating redundant paths using port trunks or spanning

tree.

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