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Solution<br />

There are three steps to setting up an aggregated Ethernet interface. First, enable<br />

Ethernet aggregation on the router:<br />

[edit chassis]<br />

aviva@router1# set aggregated-devices ethernet device-count 24<br />

Second, enable aggregation on the Ethernet interface:<br />

[edit interfaces fe-0/0/3]<br />

aviva@router1# set fastether-options 802.3ad ae0<br />

Finally, configure the aggregated Ethernet interface:<br />

[edit interfaces ae0]<br />

aviva@router1# set vlan-tagging<br />

aviva@router1# set unit 0 vlan-id 1<br />

aviva@router1# set unit 0 family inet address 10.10.10.1/24<br />

<strong>Discussion</strong><br />

Link aggregation of Ethernet interfaces, defined in the IEEE 802.3ad standard, is a<br />

way to aggregate multiple connections from a switch into a single logical interface on<br />

a Fast Ethernet or Gigabit Ethernet interface on an M-series or T-series router. (Jseries<br />

boxes do not support Ethernet aggregation). The JUNOS software balances<br />

traffic across all member links within an aggregated Ethernet bundle.<br />

This recipe configures a bundle of 24 aggregated logical interfaces. The set<br />

aggregated-devices ethernet command tells the router chassis process to treat the<br />

Ethernet logical interfaces configured for aggregation as separate virtual devices. On<br />

the Fast Ethernet interface, the set fastether-options 802.3ad ae0 command turns on<br />

aggregation on the interface and associates the interface with aggregated Ethernet<br />

interface 0. Because the aggregation creates virtual links on the interface, do not configure<br />

a logical interface on the Fast Ethernet interface.<br />

To set up the aggregated Ethernet interface itself, configure VLAN tagging and a logical<br />

interface with an IP address on interface ae0.<br />

Verify the configuration by looking at the Fast Ethernet and aggregated Ethernet<br />

interfaces. On the Fast Ethernet interface, you see the logical interface points to the<br />

aggregated Ethernet bundle:<br />

aviva@router1> show interfaces fe-0/0/3<br />

Physical interface: fe-0/0/3, Enabled, Physical link is Up<br />

Interface index: 131, SNMP ifIndex: 82<br />

Description: to nutmeg fe-003<br />

Link-level type: Ethernet, MTU: 1518, Speed: 100mbps, Loopback: Disabled,<br />

Source filtering: Disabled, Flow control: Enabled<br />

Device flags : Present Running<br />

Interface flags: SNMP-Traps 16384<br />

Link flags : 4<br />

CoS queues : 4 supported<br />

Connecting to an Ethernet Switch | 223<br />

This is the Title of the Book, eMatter Edition<br />

Copyright © 2008 O’Reilly & Associates, Inc. All rights reserved.

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