I was wondering the differences between the methods of configuring Etherchannels.
Pagp, LACP and "mode on"
We recently had some contractors come through and re-engineer one of our facilities. I'm trying to go through and fix inconsistencies and misconfigurations but before I do I need to be sure of their implementation.
You should use care when using the on mode. This is a manual configuration, and ports on both ends of the EtherChannel must have the same configuration. If the group is misconfigured, packet loss or spanning-tree loops can occur.
When using PAgP or LACP, the switch learns the identity of partners capable of supporting PAgP or LACP and the capabilities of each port.
It then dynamically groups similarly configured ports into a single logical link (channel or aggregate port). Similarly configured ports are grouped based on hardware, administrative, and port parameter constraints. For example, PAgP or LCAP groups the ports with the same speed, duplex mode, native VLAN, VLAN range, and trunking status and type. After grouping the links into an EtherChannel, PAgP or LCAP adds the group to the spanning tree as a single switch port.