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Re: Switchport mode Access/Trunk vs. General?

msi
Luminary Luminary
Luminary

Switchport mode Access/Trunk vs. General?

We're moving more workloads to the M4300 series of switches and wanted to revisit some conventions in our internal documentation.

 

In the early days you could only use what is now named "General" mode where you haveto define VLAN membership, tagging and PVID individually. For some time now similar to another vendor we can use "switchport mode access" for a client-facing port that only has 1 VLAN or we can use "switchport mode trunk" where by default all traffic is tagged, unless you define one VLAN as the native VLAN.

 

Going forward I can see that in some areas using "switchport mode access" could lead to a shorter and understandable config and I'm guessing what it considered recommended by now since the SW Admin Manual for the M4300 says about general mode "Ports conform to NETGEAR *legacy switch behavior* for switch ports." so is general mode to be considered "legacy" by now?

Model: GSM4352PB|M4300-52G-PoE+ - 48x1G PoE+ Stackable Managed Switch with 2x10GBASE-T and 2xSFP+ (1
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DaneA
NETGEAR Moderator

Re: Switchport mode Access/Trunk vs. General?

@msi,

 

I inquired your concern to the higher tier of NETGEAR Support and got their feedback.  According to them, General Mode is not legacy.  It is just a different way of doing the configuration.  Access Mode and Trunk Mode were added for those who were more familiar with Cisco and wished to configure it that way.  They both will achieve the same results if you configure them correctly.

 

 

Regards,

 

DaneA

NETGEAR Community Team

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msi
Luminary Luminary
Luminary

Re: Switchport mode Access/Trunk vs. General?

I'd be interested in hearing from the Netgear crew if possible since I've come the the (interim) conclusion that in general mode especially trunks end up to longer configs. For example:

 

configure interface
interface  X/X/X
vlan ingressfilter
vlan participation exclude 1
vlan participation include 200-205
vlan tagging 200-205
exit

configure interface
interface  X/X/X
switchport mode trunk
switchport trunk allowed vlan 200-205
exit

The additional lines in general mode is due to the fact that ingressfilter is automatically enabled trunk mode and any that general mode always includes the default VLAN and that it has to be explicitely excluded - which doesn't seem the case in trunk (and in access mode)

 

switchport mode access also seems to end up with shorter configs to:

configure
interface  X/X/X
vlan pvid 200
vlan ingressfilter
vlan participation exclude 1
vlan participation include 200
exit

configure
interface  X/X/X
switchport mode access
switchport access vlan 200
exit

Of course the actual configs end up being larger since in my case I do set 'vlan acceptframe' and other things.

 

Still: If you save 2-3 lines per port config, this starts to add up in complete config file on a stack of switches, hence my initial question if there is an actual recommendation from Netgear's side.

Message 2 of 4
DaneA
NETGEAR Moderator

Re: Switchport mode Access/Trunk vs. General?

@msi,

 

I inquired your concern to the higher tier of NETGEAR Support and got their feedback.  According to them, General Mode is not legacy.  It is just a different way of doing the configuration.  Access Mode and Trunk Mode were added for those who were more familiar with Cisco and wished to configure it that way.  They both will achieve the same results if you configure them correctly.

 

 

Regards,

 

DaneA

NETGEAR Community Team

Message 3 of 4
msi
Luminary Luminary
Luminary

Re: Switchport mode Access/Trunk vs. General?

Hi @DaneA 

 

Thanks for taking the time to check this internally, good to hear that both ways are still valid.

 

What makes general mode more verbose (hence harder to read) is that I have to enable ingress filtering explicitely if I want it (which I do prefer to be enabled), and the fact that VLAN 1 (as far as I understood) has to explicitely excluded if not used. I'm not specifically coming from a Cisco background, but these are some of the reasons as to why my personal preference goes to switchport mode access/trunk - as of now.

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