Vlan Router Interfaces; Vlan Implementation - Nortel 8300 User Manual

24 VLANs, Spanning Tree, and Static Link Aggregation
How the frame is forwarded is based on the VLAN the frame is received
and on the forwarding options available for that VLAN. A ERS 8300 tries to
associate untagged frames with a VLAN in the following order:
•
•
If the frame meets none of the preceding criteria, it is discarded.

VLAN router interfaces

Virtual router interfaces correspond to routing on a virtual port associated
with a VLAN. This type of routing is the routing of IP traffic to and from a
VLAN. Because a given port can belong to multiple VLANs (some of which
are configured for routing on the switch and some of which are not), there is
not a one-to-one correspondence between the physical port and the router
interface. For VLAN routing, the router interface for the VLAN is called a
virtual router interface because the IP address is assigned to an interface
on the routing entity in the switch. This initial interface has a one-to-one
correspondence with a VLAN on any given switch.
The ERS 8300 chassis supports 4096 MAC addresses. If you are using
an 8600 chassis, make sure it supports 4096 MAC addresses. You can
install the 8600 MAC upgrade kit to support 4096 MAC addresses. For
more information, see the publication, Adding MAC addresses to the 8600
Series Switch (part number 212486-A).

VLAN implementation

This section describes how to implement VLANs on a ERS 8300. The
following topics are included:
•
•
•
Default VLANs
The ERS 8300 is factory configured with all ports residing in a port-based
VLAN and default spanning tree group (STG) 1. With all ports in this default
VLAN, the switch behaves like a layer 2 switch. The VLAN ID of this default
VLAN is always 1, and it is always a port-based VLAN. The default VLAN
cannot be deleted.
Unassigned VLANs
The unassigned VLAN is a port-based VLAN that acts as a placeholder for
ports that are removed from other port-based VLANs. Ports can belong to
policy-based VLANs as well as to the unassigned VLAN. If a frame does not
meet any policy criteria and there is no underlying port-based VLAN, the
Configuration — VLANs, Spanning Tree, and Static Link Aggregation using Device Manager
Copyright © 2005-2007, Nortel Networks
.
Does the frame belong to a protocol-based VLAN?
What is the port-based VLAN of the receiving port?
"Default VLANs" (page 24)
"Unassigned VLANs" (page 24)
"VLAN rules" (page 25)
Nortel Ethernet Routing Switch 8300
NN46200-510 03.01 Standard
4.0 27 August 2007