Cisco Systems 15327 Manual de usuario descargar pdf (Pagina 149)

100

101

CHAPTER

10-1

Ethernet Card Software Feature and Configuration Guide, R7.2

January 2009

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 10-1

• Understanding Encapsulation over EtherChannel or POS Channel, page 10-7

• Monitoring and Verifying EtherChannel and POS, page 10-9

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 IEEE

802.3 Ethernet interfaces to provide

fault-tolerant high-speed links between switches, routers, and servers. EtherChannel forms a single

higher bandwidth routing or bridging endpoint and was designed primarily for host-to-switch

connectivity. The ML-Series card extends this link aggregation technology to bridged POS interfaces.

POS channel is only supported with LEX encapsulation.

Link aggregation provides the following benefits:

• Logical aggregation of bandwidth

• Load balancing

• Fault tolerance

Port channel is a term for both POS channel and EtherChannel. The port channel interface is treated as

a single logical interface although it consists of multiple interfaces. Each port channel interfaces consists

of one type of interface, either Fast Ethernet, Gigabit Ethernet, or POS. You must perform all port

channel configurations on the port channel (EtherChannel or POS channel) interface rather than on the

individual member Ethernet or POS interfaces. You can create the port channel interface by entering the

interface port-channel interface configuration command.

Port channel connections are fully compatible with IEEE 802.1Q trunking and routing technologies.

IEEE

802.1Q trunking can carry multiple VLANs across a port channel.

Each ML100T-12, ML100X-8, or ML1000-2 card supports one POS channel, a port channel made up of

the two POS ports. A POS channel combines the two POS port capacities into a maximum aggregate

capacity of STS-48c or VC4-16c.

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