difference between lacp pagp when trunking

[dolanduck.]

i am a bit confused on lacp and pagp. when setting trunking mode is it the same steps on both because i have seen some people who do the  interface port command on pagp  and they enable trunking through there but on lacp they don't do the interface thing why?

[Hiko]

Hi
If you use Etherchannel this steps must be same both of switch
Duplex has to be the same.
 Speed has to be there same.
 Same native AND allowed VLANs.
 Same switchport mode (access or trunk).

Etherchannel have 2 protocol LACP and PAGP(CISCO proprietary)
only you must use one etherchannel protocol

active Enable LACP unconditionally
auto Enable PAgP only if a PAgP device is detected
desirable Enable PAgP unconditionally
on Enable Etherchannel only
passive Enable LACP only if a LACP device is detected
auto and desirable are PAgp mode if you use auto mode this switch neighbors must be desirable . or if you use active mode for LACP and this switch neighbors port must be passive
I hope you understand me thanks

[balaji.bandi · Accepted solution]

Both nearly work same way.

In high level.

PAGP is Cisco Proprietary

LACP Standard ( works with inter-penetrability with other vendors too.)

When you configuring Port-channel / Etherchannel, interface configuration will be override by port-channel/ether channel configuration.