CHAPTER 21
VLANs
This chapter provides information on configuring virtual local area networks (VLANs) in support of enhanced
or extended services. Product-specific and feature-specific Administration Guides provide examples and
procedures for configuration of services on the system that may utilize VLANs. You should select the
configuration example that best meets your service model before using the procedures described below.
•
Overview, page 235
•
Creating VLAN Tags, page 236
•
Verifying the Port Configuration, page 237
•
Configuring Subscriber VLAN Associations, page 238
•
VLAN-Related CLI Commands , page 239
Overview
Virtual LANs (VLANs) provide greater flexibility in the configuration and use of contexts and services.
They are configured as "tags" on a per-port basis and allow more complex configurations to be implemented.
The VLAN tag allows a single physical port to be bound to multiple logical interfaces that can be configured
in different contexts. Therefore, each Ethernet port can be viewed as containing many logical ports when
VLAN tags are employed.
Overlapping IP Address Pool Support – GGSN
Overlapping IP Address pools allow operators to more flexibly support multiple corporate VPN customers
with the same private IP address space without expensive investments in physically separate routers or virtual
routers.
The system supports two types of overlapping pools:
•
Resource pools are designed for dynamic assignment only, and use a VPN tunnel (such as a GRE tunnel)
to forward and receive the private IP addresses to and from the VPN.
•
Overlap pools can be used for both dynamic and static addressing, and use VLANs and a next hop
forwarding address to connect to the VPN customer.
ASR 5500 System Administration Guide, StarOS Release 21.5
235
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