07-17-2008 09:58 AM - edited 03-03-2019 10:47 PM
Could someone explain to me the difference between L2 Trunking vs L3 Trunking?
This is mentioned in a Cisco document "Catalyst 3560 Switch Software Configurtion Guide" under Configuring VLANs Trunks.
I appreciate the help in advance,
sK
07-17-2008 10:30 AM
In a nutshell, L3 trunking is accomplished by configuring sub interfaces on a particular layer port while L2 trunking is done with a couple of commands in a single interface (with no subinterfaces).
Hope it helps
07-17-2008 10:41 AM
There is no such thing as Layer3 trunking.
Trunking is the ability to carry more than one vlan via a link. This is a strictly a Layer2 feature.
Perhaps, you are referring to Layer2 vs Layer3 Etherchanneling?
BTW, I read the document you are referring to, I don't see any mentioning of Layer3 trunking anywhere.
HTH,
__
Edison.
07-17-2008 10:47 AM
Edison,
In the documentation I found a note saying:
"The switch does not support Layer 3 trunks; you cannot configure subinterfaces or use the encapsulation keyword on Layer 3 interfaces."
So I guess that is the reason of the question.
Gary
07-17-2008 10:56 AM
I think the document is just saying that the switch doesn't support trunking on a Layer 3 interface.
In other words you can't issue the command no switchport and then try and use that interface to form a trunk.
07-17-2008 10:59 AM
Gary,
I see the confusion.
I much prefer calling that sub-interface rather than Layer 3 trunk but I see the message the documentation is trying to convey.
Good catch, I missed that little section before.
Thanks
__
Edison.
07-17-2008 11:48 AM
Correct. The mentionning of L2 vs L3 trunking was on page 12-20 under the note section. Sorry for not making that clear in my original inquiry.
Thanks to all for your responses. I understand it now.
sK
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