Maximum VLANs on trunk Port

[ahmedumair]

Hi,

Could you please let me know how many VLANs can be added on trunk port on cisco switches (Maximum VLANs that can be allowed on trunk ports of a cisco switches)??.

Thanks & Regards,

Ahmed Umair                  

[mahmoodmkl]

Hi

its the number of vlans supported by the switch.by default all the vlans are added on the trunk ports

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[Abzal]

Hi,

A trunk port by default allows all VLAN to be passed over it. But also trunk port could be configured to allow only certain VLANs.

int g0/0

switchport mode trunk

switchport trunk allow vlan 10-20

Verification:

show interface trunk

This will show you which VLANs are allowed on that port.

Hope it will help.

Best regards,
Abzal

[ahmedumair]

Hi All,

Thanks you very much for your support.

I totally agree with that we can allow certain VLAN on trunk port with the help of above configruation.

Int Gig0/0

switchport mode trunk

switchport trunk allow VLAN add 10-15

But my question is how many VLANs we can allow on trunk port?

And How many VLANs we can create on Cisco 3750 & 6500 Series Switch.

Thanks & Regards

Ahmed Umair

[johnlloyd_13]

Hi,

You can check the maximum VLANs locally created on a switch by issuing a 'show vtp status' command.

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[Abzal]

Hi,

Those swithces supports up to 4094 VLANs. And there is some specific ranges of VLANs.

http://www.cisco.com/en/US/docs/ios/12_4t/12_4t15/ht_xvlan.html

As I said you can simply verify it with this command:

sh int trunk

If you have one of those model switches.

Hope it will help.

Best regards,
Abzal

[Daniel McDavid]

If you are running PVST/PVST+, your limitation will likely be the maximum number to spanning-tree instances. See this blog post for more details:

http://blog.habets.pp.se/2009/06/Spanning-tree-limits