Link Aggregation: PAGP AND LACP Basic Config: Simple and To The Point
Link aggregation groups (LAG) are used to bundle several physical links into one logic link between switches.
There are two standards of Link groups PAGP (Cisco) and LACP (IEEE).
PAGP Config in our example:
Switch 1
conf t
interface port-channel 1
sw mode trunk
end
conf t
int fa0/1-2
sw mode trunk
channel-group 1 mode desirable
Switch 2
conf t
interface port-channel 1
sw mode trunk
end
conf t
int fa0/1-2
sw mode trunk
channel-group 1 mode auto
LACP Config in our example:
Switch 1
conf t
interface port-channel 2
sw mode trunk
end
conf t
int fa0/3-4
sw mode trunk
channel-group 2 mode active
Switch 3
conf t
interface port-channel 2
sw mode trunk
end
conf t
int fa0/3-4
sw mode trunk
channel-group 2 mode passive
LACP also has an "on" mode which the switches will form an etherchannel if both ends are in "on" mode (not shown in this video).
Helpful ISO commands used in this video.
show run (displays running config)
show etherchannel summary (show summary of LAGs)
It is recommend to schedule downtime when configuring LAGs in a live environment as there will be a moment of downtime while the switch form the LAG.
CHAPTERS
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0:00 Intro
2:20 PAGP
7:52 LACP
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