Layer 3 Trunking
Switch#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#interface fastethernet 0/1
Switch(config-if)#switchport trunk encapsulation dot1Q
Switch(config-if)#switchport mode trunk
Switch(config-if)#
Switch(config-if)#
ETHERCHANNEL
EtherChannel is a port link aggregation technology developed by Cisco, which provides fault-
tolerant high-speed links between Switches, Routers, and Servers. EtherChannel technology
allows multiple physical Ethernet links (Fast Ethernet or Gigabit Ethernet) to combine into one
logical channel.EtherChannel technology allows grouping of several physical Ethernet links (Fast Ethernet,
Gigabit Ethernet, or 10 Gigabit Ethernet) to create one logical Ethernet link for the purpose of
providing fault-tolerance and high-speed links between switches, routers and servers.EtherChannel technology can be used to increase the bandwidth between two devices that
support EtherChannel technology and EtherChannel technology provides automatic recovery for
the loss of a link by redistributing the load across the remaining links. EtherChannel technology
allows automatic redirection of network traffic from the failed link to the remaining links in
EtherChannel.There are two protocols used for negotiating EtherChannel and Link Aggregation. We can
configure Etherchannel in three ways in Cisco Switches.- Port Aggregation Protocol (PAgP) - Cisco Proprietary protocol
- IEEE Link Aggregation Protocol (LACP) - Industry Standard
Manual Etherchannel Configuration - Without using any negotiation protocol listed above