On S1 and S3, add ports F0/21 and F0/22 to Port Channel 1 with the channel-group 1 mode desirable command. Port Mode Encapsulation Status Native vlan Use the show interfaces trunk command to ensure that you have an active trunk link for those two links, and the native VLAN on both links is the same. Configure the ports on both switches as static trunk ports. The first EtherChannel that is created for this activity aggregates ports F0/21 and F0/22 between S1 and S3. The ports and port channels can be re-enabled after EtherChannel is configured. Otherwise, EtherChannel Misconfig Guard may place these ports into err-disabled state. Note : When co nfiguring EtherChannels, it is recommended to shut down the physical ports being grouped on both devices before configuring them into channel groups. Part 2: Configure an EtherChannel with Cisco PAgP DTP can be disabled on interfaces with the switchport nonegotiate command. The default mode on a 2960 switch is for DTP to be enabled and set to dynamic auto. Note : If the ports are configured with DTP dynamic auto mode, and you do not set the mode of the ports to trunk, the links do not form trunks and remain access ports. Configure all ports that are required for the EtherChannels as static trunk ports. Commands that provide information about the state of the switch ports include: Before beginning the link aggregation between switches, verify the existing configuration of the ports that connect the switches to ensure that the ports will successfully join the EtherChannels. Assign each switch a hostname according to the topology diagram. Instructions Part 1: Configure Basic Switch Settings 
In this lab, you will configure Port Aggregation Protocol ( PAgP ), a Cisco EtherChannel protocol, and Link Aggregation Control Protocol ( LACP), an IEEE 802.3ad open standard version of EtherChannel.īefore beginning the configuration, review the EtherChannel Configuration Guidelines and Restrictions listed at the end of this activity. EtherChannel allows up to eight redundant links to be bundled together into one logical link.
However, using only one link utilizes only half of the available bandwidth. As configured, only one of these links can be used otherwise, a bridging loop might occur. There are redundant uplinks between the switches. Part 4: Configure a Redundant EtherChannel Link Background Part 3: Configure an 802.3ad LACP EtherChannel Packet Tracer – Configure EtherChannel (Answers Version)Īnswers Note : Red font color or g ray highlights indicate text that appears in the Answers copy only.
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