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CHAPTER 5
Configuring VLAN and S-VLAN
Subinterfaces
VLAN Overview
Copyright © 2010, Juniper Networks, Inc.
This chapter describes how to configure VLAN and S-VLAN subinterfaces on E Series
routers.
This chapter contains the following sections:
VLAN Overview on page 167
S-VLAN Overview on page 168
VLAN and S-VLAN Platform Considerations on page 169
VLAN and S-VLAN References on page 170
Creating a VLAN Subinterface on page 170
Configuring an S-VLAN Subinterface on page 178
Configuring S-VLAN Tunnels for Layer 2 Services over MPLS on page 182
S-VLAN Oversubscription on page 185
Monitoring VLAN and S-VLAN Subinterfaces on page 186
A virtual LAN (VLAN) enables multiplexing multiple IP and PPPoE interfaces and MPLS
interfaces over a single physical Ethernet port. This multiplexing is accomplished through
VLAN subinterfaces. Ethernet interfaces support the 802.1q-1998 IEEE Standards for
Local and Metropolitan Area Networks: Virtual Bridged Local Area Networks, which the
router uses as its standardized format for frame tagging.
The Ethernet V2 frame format enables multiplexing of different protocols over a single
physical link. IEEE 802.1q compatibility extends the frame format by adding a tag that
contains a VLAN ID. This feature enables multiplexing of different channels (VLANs)
over the physical link; each channel is able to multiplex different protocols.
This capability works very much like ATM encapsulation as described in RFC
2684—Multiprotocol Encapsulation over ATM Adaptation Layer 5 (September 1999).
This encapsulation type enables multiplexing of multiple protocols over a single ATM
virtual circuit (VC).
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