Link aggregation group

Q: How deeply does Acing the CCNA Exam: Volume 2 Advanced Networking and Security cover link aggregation group?

Explains logical behavior, static-mode limitations, member-port operation, trunk configuration, and verification-relevant defaults without detailing negotiation protocols.

As explained in Acing the CCNA Exam: Volume 2 Advanced Networking and Security

Link aggregation is the combination of multiple physical network links into one logical link to increase bandwidth and provide link redundancy.

A link aggregation group (LAG) combines multiple physical links into one logical connection, increasing bandwidth and providing redundancy. In a wireless LAN, a WLC commonly uses a LAG to connect to a switch through a trunk. section 21.1.1 section 21.2.1

Apply these implementation rules:

Treat LAG and EtherChannel as equivalent terminology on Cisco WLCs. section 21.1.1
Use a static LAG with mode on; Cisco WLCs do not support PAgP or LACP negotiation. section 21.1.1 section 21.4
Configure the switch-side port-channel as a trunk and allow the required VLANs. section 21.1.1
Include WLC distribution-system ports in the LAG; one functioning physical member keeps the LAG operational. section 21.2.1

Static WLC LAG trunk

On SW1, combine F0/1 and F0/2 into port-channel 1, then configure the logical link as a trunk carrying VLANs 10, 100, and 200: `interface range f0/1-2`, `channel-group 1 mode on`, `interface port-channel 1`, `switchport mode trunk`, `switchport trunk allowed vlan 10,100,200`. Enable LAG on WLC1 during its initial configuration so its distribution-system ports connect through the aggregated trunk.

SW1(config-if-range)# interface range f0/1-2             #1
SW1(config-if-range)# channel-group 1 mode on            #1
SW1(config-if-range)# interface port-channel 1           #2
SW1(config-if)# switchport mode trunk                    #2
SW1(config-if)# switchport trunk allowed vlan 10,100,200 #2
#1 Configures F0/1 and F0/2 as members of a static LAG
#2 Configures the LAG as a trunk and allows only the three VLANs used in the LAN

Browse the annotated Cisco IOS listing for member-port, port-channel, trunk, and allowed-VLAN configuration. section 21.1.1

How Acing the CCNA Exam: Volume 2 Advanced Networking and Security covers it

Cover of Acing the CCNA Exam: Volume 2 Advanced Networking and Security

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Related concepts

etherchannelequivalent to · EtherChannel is a link-aggregation technology that combines multiple physical Ethernet links into one logical connection.
wireless LAN controllerconfigures · A wireless LAN controller is a network platform that centrally manages wireless access points, their configuration, and their client connections.
distribution system portimplemented by · A distribution system port is a wireless LAN controller network port that connects the controller to the wired distribution system.

This explainer was generated by Manning's knowledge graph from the text of Acing the CCNA Exam: Volume 2 Advanced Networking and Security. The section links point to the parts of the book it draws on.