Cisco Systems 7600 EtherChannel Feature Overview, Understanding How EtherChannels Are Configured

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Chapter 12 Configuring EtherChannels

Understanding How EtherChannels Work

EtherChannel Feature Overview

An EtherChannel bundles individual Ethernet links into a single logical link that provides the aggregate bandwidth of up to eight physical links.

With Release 12.2(18)SXE and later releases, a Cisco 7600 series router supports a maximum of

128EtherChannels. With releases earlier than Release 12.2(18)SXE, a Cisco 7600 series router supports a maximum of 64 EtherChannels.

You can form an EtherChannel with up to eight compatibly configured LAN ports on any module in a Cisco 7600 series router. All LAN ports in each EtherChannel must be the same speed and must all be configured as either Layer 2 or Layer 3 LAN ports.

Note The network device to which a Cisco 7600 series router is connected may impose its own limits on the number of ports in an EtherChannel.

If a segment within an EtherChannel fails, traffic previously carried over the failed link switches to the remaining segments within the EtherChannel. When a failure occurs, the EtherChannel feature sends a trap that identifies the router, the EtherChannel, and the failed link. Inbound broadcast and multicast packets on one segment in an EtherChannel are blocked from returning on any other segment of the EtherChannel.

Understanding How EtherChannels Are Configured

These sections describe how EtherChannels are configured:

EtherChannel Configuration Overview, page 12-2

Understanding Manual EtherChannel Configuration, page 12-3

Understanding PAgP EtherChannel Configuration, page 12-3

Understanding IEEE 802.3ad LACP EtherChannel Configuration, page 12-4

EtherChannel Configuration Overview

You can configure EtherChannels manually or you can use the Port Aggregation Control Protocol (PAgP) or the Link Aggregation Control Protocol (LACP) to form EtherChannels. The EtherChannel protocols allow ports with similar characteristics to form an EtherChannel through dynamic negotiation with connected network devices. PAgP is a Cisco-proprietary protocol and LACP is defined in IEEE 802.3ad.

PAgP and LACP do not interoperate with each other. Ports configured to use PAgP cannot form EtherChannels with ports configured to use LACP. Ports configured to use LACP cannot form EtherChannels with ports configured to use PAgP. Neither interoperates with ports configured manually.

Table 12-1lists the user-configurable EtherChannel modes.

Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX

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Contents Configuring EtherChannels 12-1EtherChannel Configuration Overview EtherChannel Feature OverviewUnderstanding How EtherChannels Are Configured 12-212-3 Understanding Manual EtherChannel ConfigurationUnderstanding PAgP EtherChannel Configuration Understanding Ieee 802.3ad Lacp EtherChannel Configuration 12-412-5 Understanding Port Channel InterfacesUnderstanding Load Balancing 12-6 Router# show running-config interface Routerconfig# interface port-channelRouterconfig# no interface port-channel 12-712-8 Configuring Channel GroupsRouter# show running-config interface port-channel Router# show running-config interface fastethernet 5/6 Routerconfig-if# no lacp port-priorityRouter# show running-config interface type 12-9Configuring the Lacp System Priority and System ID 12-10Reverts to default EtherChannel load balancing Configuring EtherChannel Load BalancingConfigures EtherChannel load balancing 12-11Routerconfig-if# no port-channel min-links Configuring the EtherChannel Min-Links FeatureRouterconfig-if# port-channel min-links number 12-12
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