Port-channel, also known as EtherChannel or Link Aggregation, is a technology used to bundle multiple physical Ethernet links together to form a single logical link. This is done to increase the bandwidth and provide redundancy.
Here are some key points to remember for CCNA preparation:
- Port-channel can be configured on Cisco switches using the "interface Port-channel" command.
- Physical Ethernet links that are part of a port-channel must be configured with the same speed, duplex, and VLAN membership.
- Port-channel can be configured in either active or passive mode. In active mode, the switch actively tries to establish a port-channel connection, while in passive mode, the switch only responds to requests to form a port-channel.
- Port-channel can use either static or dynamic (LACP or PAgP) protocol to bundle the links.
- Port-channel can provide redundancy by using the Link Aggregation Control Protocol (LACP) to monitor the status of the physical links in the bundle.
- Port-channel can also be used with other redundancy protocols such as Virtual Router Redundancy Protocol (VRRP) or Hot Standby Router Protocol (HSRP) to provide redundancy at the IP level.
Examples:
- To create an etherchannel with channel-group 1 and with mode active
interface range Fa0/1 - 2
channel-group 1 mode active
- To check the etherchannel status
show etherchannel summary
- To check the ports that are part of the etherchannel
show etherchannel port-channel
Note: This is just a basic cheat sheet and it is recommended to read the official Cisco documentation for more detailed and accurate information.
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