TB - GNS3 Lab: PAgP LACP Etherchannel
by C. Casquatch
Lab from Renee Molenaar
Topology
SW1 <--> SW2 : Gi0/0, Gi0/1
SW1 <--> SW3 : Gi0/3, Gi0/1
SW2 <--> SW3 : Gi0/2, Gi0/3
Lab Goals
- Configure PAgP between SW1 and SW2:
- SW1 = desirable (active)
- SW2 = auto (passive)
- Configure LACP between SW1 and SW3:
- SW1 = active
- SW3 = passive
- Configure static EtherChannel between SW2 and SW3 (no negotiation protocol).
- Set EtherChannel on SW1 to use destination MAC address for load-balancing.
Step-by-Step Configuration
1. PAgP EtherChannel: SW1 ↔ SW2
On SW1:
conf t
interface range gi0/0 - 1
channel-group 1 mode desirable
exit
interface port-channel 1
switchport
switchport mode access
exit
On SW2:
conf t
interface range gi0/0 - 1
channel-group 1 mode auto
exit
interface port-channel 1
switchport
switchport mode access
exit
2. LACP EtherChannel: SW1 ↔ SW3
On SW1:
conf t
interface range gi0/3, gi0/1
channel-group 2 mode active
exit
interface port-channel 2
switchport
switchport mode access
exit
On SW3:
conf t
interface range gi0/0 - 1
channel-group 2 mode passive
exit
interface port-channel 2
switchport
switchport mode access
exit
3. Static EtherChannel: SW2 ↔ SW3
On SW2:
conf t
interface range gi0/2 - 3
channel-group 3 mode on
exit
interface port-channel 3
switchport
switchport mode access
exit
On SW3:
conf t
interface range gi0/2 - 3
channel-group 3 mode on
exit
interface port-channel 3
switchport
switchport mode access
exit
4. Load-Balancing (SW1)
On SW1:
conf t
port-channel load-balance dst-mac
exit
Verification Commands
show etherchannel summary
show interfaces port-channel 1
show interfaces port-channel 2
show interfaces port-channel 3
show running-config | include channel-group
show etherchannel load-balance
Notes
- Ensure all interfaces in a channel have matching speed, duplex, switchport mode.
- Shut/no shut interfaces if channels don’t form.
- Use the following for troubleshooting:
show pagp neighbor(PAgP)show lacp neighbor(LACP)show log
tags: GNS3 - pagp - Networking - lacp - etherchannel