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What does it mean when you have ports showing no VLAN attached?

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sonikbaby
Level 1
Level 1

‎02-24-2012 03:03 PM - edited ‎03-07-2019 05:10 AM

When I run a sh vlan Brief on the 4507 switches I get this feedback:

BELL-SW1-4507R#show vlan brief

VLAN Name                             Status    Ports

---- -------------------------------- --------- -------------------------------

1    default                          active    Gi1/1, Gi1/2, Gi2/1, Gi2/2

                                                Gi3/1, Gi3/2, Gi3/4, Gi3/5

                                                Gi3/6, Gi3/7, Gi3/8, Gi3/9

                                                Gi3/10, Gi3/13, Gi3/14, Gi3/15

                                                Gi3/16, Gi3/17, Gi3/18, Gi3/19

                                                Gi3/20, Gi3/21, Gi3/22

8    VLAN0008                         active    Gi3/11, Gi3/12, Gi3/23, Gi3/24

                                                Gi3/25, Gi3/26, Gi3/27, Gi3/28

                                                Gi3/29, Gi3/30, Gi3/31, Gi3/32

                                                Gi3/33, Gi3/34, Gi3/35, Gi3/36

                                                Gi3/37, Gi3/38, Gi3/39, Gi3/40

                                                Gi3/41, Gi3/42, Gi3/43, Gi3/44

                                                Gi3/45, Gi3/46, Gi3/47, Gi3/48

                                                Gi4/20, Gi4/30, Gi4/34, Gi4/37

                                                Fa5/1, Fa5/3, Fa5/14, Fa5/38

                                                Fa5/41, Fa5/42, Fa6/2, Fa6/4

                                                Fa6/11, Fa6/21, Fa6/22, Fa6/23

                                                Fa6/27, Fa7/14

12   VLAN0012                         active    Gi3/3, Fa7/36

16   VLAN0016                         active    Gi4/4, Gi4/5, Gi4/6, Gi4/7

VLAN Name                             Status    Ports

---- -------------------------------- --------- -------------------------------

                                                Gi4/8, Gi4/9, Gi4/10, Gi4/11

                                                Gi4/12, Gi4/13, Gi4/14, Gi4/15

                                                Gi4/16, Gi4/17, Gi4/18, Gi4/19

                                                Gi4/21, Gi4/22, Gi4/23, Gi4/24

                                                Gi4/25, Gi4/26, Gi4/27, Gi4/28

                                                Gi4/29, Gi4/31, Gi4/32, Gi4/33

                                                Gi4/35, Gi4/36, Gi4/38, Gi4/39

                                                Gi4/40, Gi4/41, Gi4/42, Gi4/43

                                                Gi4/44, Gi4/45, Gi4/46, Gi4/47

                                                Gi4/48, Fa5/2, Fa5/4, Fa5/5

                                                Fa5/6, Fa5/7, Fa5/8, Fa5/9

                                                Fa5/10, Fa5/11, Fa5/12, Fa5/13

                                                Fa5/15, Fa5/16, Fa5/17, Fa5/18

                                                Fa5/19, Fa5/20, Fa5/21, Fa5/22

                                                Fa5/23, Fa5/24, Fa5/25, Fa5/26

                                                Fa5/27, Fa5/28, Fa5/29, Fa5/30

                                                Fa5/31, Fa5/32, Fa5/33, Fa5/34

                                                Fa5/35, Fa5/36, Fa5/37, Fa5/39

                                                Fa5/40, Fa5/43, Fa5/44, Fa5/45

                                                Fa5/46, Fa5/47, Fa5/48, Fa6/1

VLAN Name                             Status    Ports

---- -------------------------------- --------- -------------------------------

                                                Fa6/3, Fa6/5, Fa6/6, Fa6/7

                                                Fa6/8, Fa6/9, Fa6/10, Fa6/12

                                                Fa6/13, Fa6/14, Fa6/15, Fa6/16

                                                Fa6/17, Fa6/18, Fa6/19, Fa6/20

                                                Fa6/24, Fa6/25, Fa6/26, Fa6/28

                                                Fa6/29, Fa6/30, Fa6/31, Fa6/32

                                                Fa6/33, Fa6/34, Fa6/35, Fa6/36

                                                Fa6/37, Fa6/38, Fa6/39, Fa6/40

                                                Fa6/41, Fa6/42, Fa6/43, Fa6/44

                                                Fa6/45, Fa6/46, Fa6/47, Fa6/48

                                                Fa7/1, Fa7/2, Fa7/3, Fa7/4

                                                Fa7/5, Fa7/6, Fa7/7, Fa7/8

                                                Fa7/9, Fa7/10, Fa7/11, Fa7/12

                                                Fa7/13, Fa7/15, Fa7/16, Fa7/17

                                                Fa7/18, Fa7/19, Fa7/20, Fa7/21

                                                Fa7/22, Fa7/23, Fa7/24, Fa7/25

                                                Fa7/26, Fa7/27, Fa7/28, Fa7/29

                                                Fa7/30, Fa7/31, Fa7/32, Fa7/33

                                                Fa7/34, Fa7/35, Fa7/36, Fa7/37

                                                Fa7/38, Fa7/39, Fa7/40, Fa7/41

VLAN Name                             Status    Ports

---- -------------------------------- --------- -------------------------------

                                                Fa7/42, Fa7/43, Fa7/44, Fa7/45

                                                Fa7/46, Fa7/47, Fa7/48

What does it mean for the ports that are under the blank VLAN name and status section?

I assume most of these must be in VLAN 16 as that is our user VLAN and I know this switch has more then 4 ports using VLAN 16 as it indicates above.

Thanks,

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Pronoy Dasgupta
Cisco Employee
Cisco Employee

‎02-26-2012 03:23 AM

Hello,

All the ports are part of vlan 16. Do a "show run inter Gi4/8" and it would show you the same.

Show vlan brief command only shows you access ports in a specific vlan.

Using the show vlan id 16 command, would also show you the trunk ports which have vlan 16 being carried over them.

thank

PD

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mellonr
Level 1
Level 1

‎02-24-2012 04:28 PM

I'm betting that if you do a show run, you'll either find those ports are trunk (switchport mode trunk) or that they are access ports with no vlan. Think of no vlan as the same as assigning them to vlan 0. Vlan 0 doesn't really exist, its more the absence of having a vlan assigned. These ports will behave As if they are all in the same vlan.

Sent from Cisco Technical Support iPad App

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Kishore Chennupati
Level 7
Level 7

‎02-24-2012 04:35 PM

hi,

do a  "sh vlan id 16" and it will show you all the ports associated with it. that will give u an idea. possibly all these ports are part of it

cheers

Kishore

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Pronoy Dasgupta
Cisco Employee
Cisco Employee

‎02-26-2012 03:23 AM

Hello,

All the ports are part of vlan 16. Do a "show run inter Gi4/8" and it would show you the same.

Show vlan brief command only shows you access ports in a specific vlan.

Using the show vlan id 16 command, would also show you the trunk ports which have vlan 16 being carried over them.

thank

PD

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sonikbaby
Level 1
Level 1
In response to Pronoy Dasgupta

‎03-05-2012 03:51 PM

I was just looking at it it wrong. All those ports are part of vlan 16. Thanks! 

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