Vlans allowed and active in management domain

[mahesh18]

                   Hi Everyone,

Need to confirm thing below.

Port gi6/4 is trunk and goes to nei switch.

when i do sh int trunk it shows

Port        Vlans allowed on trunk

Gi4/26      41,52,510-513,515,981

Gi6/4      1-4094

Then below i see

Port        Vlans allowed and active in management domain

Gi4/26      41,52,510-513,515,981

Gi6/4       1,5,7,12-13,15-18,20,22-23,25-33,35,37-38,40-41,47,51-53,88,99-100,107,110-111,155-156,158,160,164,168,170,172,174,180,200,207,253-255,301-313,316-317,335-336,349,500-501,509-513,515,

So my understanding is that  when it says 1-4094  it  is allowing by default all the vlans from 1 to 4094 right?

When it says Vlans allowed and active in management domain  what does it mean does it mean that these vlans are active in this

switch.

for example int vlan 110 is on nei switch not on this still it shows vlan110 does it mean that only layer 2 vlan is active on this switch?

Thanks

Mahesh

[srsaunders42 · Accepted solution]

Correct Mahesh,

You allow all the vlans (1-4094) to pass through the trunk port Gi6/4 so therefor the switch now knows about all of them.

[mahesh18]

Hi,

What about this

When it says Vlans allowed and active in management domain  what does it mean does it mean that these vlans are active in this switch.

for example int SVI  vlan 110 is on nei switch not on this still it shows vlan110 does it mean that only layer 2 vlan is active on this switch?

So it is carrying traffic for vlan 110  to nei switch?

Thanks

MAhesh

[mahmoodmkl · Accepted solution]

Hi,

When it says Vlans allowed and active in management domain  what does it  mean does it mean that these vlans are active in this switch.

Yes it means these vlans are active in this switch.

2.yes it means the vlan is active at L2.

Thanks

[mahesh18]

Hi Everyone,

Thanks for answering the question.

Regards

Mahesh

[Sundararjun]

 When your Cisco switches receives an Ethernet frame without a tag on a 802.1Q enabled interface,
it will assume that it belongs to the native VLAN.  I understand this one, but when this un-tagged frames are occured?and why ?           ------------------pleas give me some explanation about this.