liveBook · Manning

Channel-group command

As explained in Acing the CCNA Exam: Volume 1 Fundamentals and Protocols

The channel-group command assigns a switch port to an EtherChannel and specifies its negotiation or static mode.

The channel-group command assigns switch ports to an EtherChannel and selects how the links form: PAgP negotiation, LACP negotiation, or static operation. Its group number identifies the EtherChannel locally on the switch. section 16.2.1 section 16.5

Use the mode keyword to choose the formation method:

  • PAgP: mode desirable actively negotiates; mode auto responds to a desirable neighbor. Auto plus auto does not form an EtherChannel. section 16.2.1
  • LACP: mode active initiates negotiation; mode passive responds to an active neighbor. LACP is the choice for forming an EtherChannel with a non-Cisco switch. section 16.2.1 section 16.5
  • Static operation: mode on creates an EtherChannel without a negotiation protocol. section 16.5

Configure and verify a PAgP channel

SW1(config)# interface range g0/0-1 SW1(config-if-range)# channel-group 1 mode desirable The command automatically creates Port-channel1. Configure settings such as trunk mode on the logical port-channel interface, then use show etherchannel summary to verify that member ports show P and the channel is in use. section 16.5

How Acing the CCNA Exam: Volume 1 Fundamentals and Protocols covers it

How deep it goes
Explains syntax, mode pairing, automatic port-channel creation, inherited settings, and status verification.
Examples
Uses interface ranges, PAgP desirable and auto configurations, Port-channel1 output, and EtherChannel summary verification.
What it assumes
Assumes interface configuration familiarity while defining negotiation modes, group numbers, and logical port-channel interfaces.
What you can do after
Operate/configure EtherChannels with appropriate PAgP, LACP, or static mode and verify their bundled-port status.
How it connects
Connects EtherChannel formation with PAgP, LACP, port-channel interfaces, trunking, and Spanning Tree Protocol.
Cover of Acing the CCNA Exam: Volume 1 Fundamentals and Protocols
liveBookmanning.com
Read Acing the CCNA Exam: Volume 1 Fundamentals and Protocols on liveBook Get the book at manning.com

This explainer was generated by Manning's knowledge graph from the text of Acing the CCNA Exam: Volume 1 Fundamentals and Protocols. The section links point to the parts of the book it draws on.