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
•Understanding Manual EtherChannel Configuration, page
•Understanding PAgP EtherChannel Configuration, page
•Understanding IEEE 802.3ad LACP EtherChannel Configuration, page
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
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
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
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