Juniper JUNOSE 11.1.X - LINK LAYER CONFIGURATION 4-7-2010, Configuration Manual

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Chapter 6
Configuring 802.3ad Link Aggregation and
Link Redundancy
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 199
■
802.3ad Link Aggregation Platform Considerations on page 201
■
802.3ad Link Aggregation References on page 202
■
Configuring 802.3ad Link Aggregation on page 202
■
Example: Configuring an IP Interface for a LAG Bundle on page 207
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Example: Configuring a PPPoE Subinterface for a LAG Bundle on page 208
■
Example: Configuring a PPPoE Subinterface over a VLAN for a LAG
Bundle on page 209
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Example: Configuring MPLS for a LAG Bundle on page 209
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Example: Configuring MPLS over a VLAN for a LAG Bundle on page 210
■
Ethernet Link Redundancy Overview on page 211
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Ethernet Link Redundancy Behavior on page 215
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Configuring Ethernet Link Redundancy on page 220
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Monitoring 802.3ad Link Aggregation on page 222
802.3ad Link Aggregation for Ethernet Overview
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.
802.3ad Link Aggregation for Ethernet Overview
■ 199