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CHAPTER 6
Configuring 802.3ad Link Aggregation and
Link Redundancy
802.3ad Link Aggregation for Ethernet Overview
Copyright © 2010, Juniper Networks, Inc.
This chapter describes how to configure 802.3ad link aggregation and link redundancy
on E Series routers.
This chapter contains the following sections:
802.3ad Link Aggregation for Ethernet Overview on page 197
802.3ad Link Aggregation Platform Considerations on page 199
802.3ad Link Aggregation References on page 200
Configuring 802.3ad Link Aggregation on page 200
Example: Configuring an IP Interface for a LAG Bundle on page 205
Example: Configuring a PPPoE Subinterface for a LAG Bundle on page 205
Example: Configuring a PPPoE Subinterface over a VLAN for a LAG Bundle on page 206
Example: Configuring MPLS for a LAG Bundle on page 207
Example: Configuring MPLS over a VLAN for a LAG Bundle on page 207
Ethernet Link Redundancy Overview on page 208
Ethernet Link Redundancy Behavior on page 212
Configuring Ethernet Link Redundancy on page 217
Monitoring 802.3ad Link Aggregation on page 218
IEEE 802.3ad link aggregation enables you to group Ethernet interfaces at the physical
layer to form a single link layer interface, also known as a link aggregation group (LAG)
or bundle. For more information, see IEEE Standard 802.3ad, Link Aggregation.
Some users require more bandwidth in their network than a single Fast Ethernet link can
provide, but cannot afford the expense or do not need the bandwidth of a higher-speed
Gigabit Ethernet link. Using IEEE 802.3ad link aggregation in this situation provides
increased port density and bandwidth at lower cost. For example, if you need 450 Mbps
of bandwidth to transmit data and have only a 100-Mbps Fast Ethernet link, creating a
LAG bundle containing five 100-Mbps Fast Ethernet links is more cost effective than
purchasing a single Gigabit Ethernet link.
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