Untitled

CCNA – EtherChannel

• Notes:
• The Port Aggregation Protocol (PAgP) and Link Aggregation Control Protocol (LACP) facilitate the automatic creation of EtherChannels by exchanging packets between Ethernet interfaces. The Port Aggregation Protocol (PAgP) is a Cisco-proprietary solution, and the Link Aggregation Control Protocol (LACP) is standards based.
• LACP modes:
• + on: the link aggregation is forced to be formed without any LACP negotiation. A port-channel is formed only if the peer port is also in “on” mode.
• + off: disable LACP and prevent ports to form a port-channel
• + passive: the switch does not initiate the channel, but does understand incoming LACP packets
• + active: send LACP packets and willing to form a port-channel
• The table below lists if an EtherChannel will be formed or not for LACP:

Slide 2

• Notes:
• The Port Aggregation Protocol (PAgP) and Link Aggregation Control Protocol (LACP) facilitate the automatic creation of EtherChannels by exchanging packets between Ethernet interfaces. The Port Aggregation Protocol (PAgP) is a Cisco-proprietary solution, and the Link Aggregation Control Protocol (LACP) is standards based.
• LACP modes:
• + on: the link aggregation is forced to be formed without any LACP negotiation. A port-channel is formed only if the peer port is also in “on” mode.
• + off: disable LACP and prevent ports to form a port-channel
• + passive: the switch does not initiate the channel, but does understand incoming LACP packets
• + active: send LACP packets and willing to form a port-channel
• The table below lists if an EtherChannel will be formed or not for LACP:
• LACPActivePassiveActiveYesYesPassiveYesNo

Slide 3