EtherChannel - jibingl/CCNA-CCNP GitHub Wiki

Aka Port Channel or Link Aggregation Croup (LAG)

Protocol	Full-name	Property	Up to Interfaces
PAgP	Port Aggregation Protocol	Cisco	8
LACP	Link Aggregation Control Protocol	Public	8/16
Static	Static EtherChannel		8

Syntax

SW1(config)#interface range START-IF - END-IF
SW1(config-if-range)#channel-group NUMBER mode CHANNEL-MODE         //channel-group number locally significant
                                   1-255       auto|desirable       //PAgP
                                               active|passive       //LACP
                                               on                   //Static

EtherChannel Forming Table

Modes	auto/passive	desirable/active	on
auto/passive	X	EtherChannel	X
desirable/active	EtherChannel	EtherChannel	X
on	X	X	EtherChannel

Configuration Requirements

All member-interfaces must have matching configurations:

• Same duplex (full/half);
• Same speed;
• Same switchport mode (access/trunk)
• Same allowed VLANs/native VLAN (for trunk interfaces)

If not matching, the mis-config interface will be excluded while EtherChannel still works with other member-interfaces matching the requirements.

Load Balance

Methods used to calculate in EtherChannel load balancing can be configured as one of dst-ip, dst-mac, src-dst-ip, src-dst-mac, src-ip, src-mac. Example:

SW1#show etherchannel load-balance
EtherChannel Load-Balancing Configuration:
      src-dst-ip
EtherChannel Load-Balancing Addresses Used Per-Protocol:
Non-IP: Source XOR Destination MAC address
  IPv4: Source XOR Destination IP address
  IPv6: Source XOR Destination IP address

SW1#conf t
SW1(config)#port-channel load-balance src-dst-mac
SW1(config)#do show etherchannel load-balance
EtherChannel Load-Balancing Configuration:
      src-dst-mac
EtherChannel Load-Balancing Addresses Used Per-Protocol:
Non-IP: Source XOR Destination MAC address
  IPv4: Source XOR Destination MAC address
  IPv6: Source XOR Destination MAC address