Table 3 Vlan Rules - Nortel 8300 User Manual

port belongs to the unassigned VLAN and the frame is dropped. Only ports
in the unassigned VLAN have no spanning tree group association, so they
do not participate in Spanning Tree Protocol negotiation; that is, no BPDUs
are sent out of ports in the unassigned VLAN.
The unassigned VLAN cannot be deleted or viewed. If a user-defined
spanning tree group is deleted, the ports are moved to the unassigned
VLAN and can later be assigned to another spanning tree group. Moving
the ports to the unassigned VLAN avoids creating unwanted loops and
duplicate connections. If routing is disabled in these ports, the port is
completely isolated and no layer 2 or layer 3 functionality is provided.
The unassigned VLAN is useful for security concerns or when using a port
for monitoring a mirrored port.
VLAN rules
Table 3 "VLAN rules" (page 25)
Table 3
VLAN rules
•
In addition to the default VLAN, the ERS 8300 supports 4000 VLANs. VLAN IDs range in
value from 1 to 4000. See note
•
If you enable tagging on a port in a VLAN, the spanning tree group configuration for that port is
lost. To preserve VLAN assignment of ports, enable tagging on the ports before you assign
the ports to VLANs.
•
Tagged ports can belong to multiple VLANs and multiple spanning tree groups. When a tagged
port belongs to multiple spanning tree groups, the BPDUs are tagged for all spanning tree
groups except for spanning tree group number 1. Under the default configuration, the default
is spanning tree group number 1.
•
An untagged port can belong to only one port-based VLAN. A port in a port-based VLAN can
belong to other policy-based VLANs.
•
An untagged port can belong to only one policy-based VLAN for a given protocol. For example,
a port can belong to only one policy-based VLAN where the policy is IPX802dot2 protocol.
•
A VLAN cannot span multiple spanning tree groups; that is, the ports in the VLAN must all
be within one spanning tree group. Spanning tree group IDs can range in value from 1 to
64. See note 1
•
A frame's VLAN membership is determined by the following order of precedence:
1. VLAN ID in the frame's VLAN tag
2. protocol-based VLAN
3. port-based VLAN
1 Also see Nortel Ethernet Routing Switch 8300 Release Notes — Software Release
4.0(NN46200-401) for the latest information about supported software and hardware capabilities.
Configuration — VLANs, Spanning Tree, and Static Link Aggregation using Device Manager
Copyright © 2005-2007, Nortel Networks
.
describes the VLAN rules for the ERS 8300.
1
Nortel Ethernet Routing Switch 8300
NN46200-510 03.01 Standard
4.0 27 August 2007
VLANs 25