CHAPTER
9-1
Cisco ONS 15454 SONET/SDH ML-Series Multilayer Ethernet Card Software Feature and Configuration Guide, R4.0
78-15224-02
9
Configuring Link Aggregation
This chapter describes how to configure link aggregation for the ML-Series cards, both EtherChannel
and Packet-over-SONET/SDH [POS] channel. For additional information about the Cisco IOS
commands used in this chapter, refer to the Cisco IOS Command Reference publication. This chapter
contains the following major sections:
• Understanding Link Aggregation, page 9-1
• Configuring EtherChannel, page 9-2
• EtherChannel Configuration Example, page 9-3
• Configuring POS Channel, page 9-4
• POS Channel Configuration Example, page 9-5
• Understanding Encapsulation over EtherChannel or POS Channel, page 9-7
• Configuring Encapsulation over EtherChannel or POS Channel, page 9-7
• Encapsulation over EtherChannel Example, page 9-8
• Monitoring and Verifying EtherChannel and POS, page 9-10
Note You might have already configured bridging, and you may now proceed with configuring link
aggregation as an optional step. See Chapter 5, “Configuring Bridging” for more general bridging
information.
Note The ML-Series does not support the routing of Subnetwork Access Protocol (SNAP) or Inter-Switch
Link (ISL) encapsulated frames.
Understanding Link Aggregation
The ML-Series card offers both EtherChannel and POS channel. Traditionally EtherChannel is a
trunking technology that groups together multiple full-duplex 802.3 Ethernet interfaces to provide
fault-tolerant high-speed links between switches, routers, and servers. EtherChannel is a logical
aggregation of multiple Ethernet interfaces. EtherChannel forms a single higher bandwidth routing or
bridging endpoint. EtherChannel is designed primarily for host-to-switch connectivity. The ML-Series
card extends this link aggregation technology to bridged POS interfaces.
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