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New Member

Vlan missing in running-config

Hi,

i am confused.

I have on 3750X stack with a few vlan

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

vvlansw06# sh vlan

VLAN Name                             Status    Ports

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

1    default                          active    Gi1/0/6, Gi1/0/10, Gi2/0/5

                                                Gi2/0/6, Gi2/0/37

10   LAN_10                           active    Gi1/0/16, Gi1/0/17, Gi1/0/19

                                                Gi1/0/20, Gi1/0/21, Gi1/0/22

                                                Gi1/0/27, Gi1/0/28, Gi1/0/29

                                                Gi1/0/30, Gi2/0/16, Gi2/0/17

                                                Gi2/0/19, Gi2/0/20, Gi2/0/21

                                                Gi2/0/22, Gi2/0/27, Gi2/0/28

                                                Gi2/0/29, Gi2/0/30, Po7, Po8

                                                Po11, Po15, Po16, Po20, Po22

                                                Po24, Po26, Po27

20   DMZ_20                           active    Gi1/0/34, Gi1/0/35, Gi1/0/36

                                                Gi2/0/34, Gi2/0/35, Gi2/0/36

                                                Po9, Po13, Po17

30   TP_30                            active   

40   MGMT_40                          active   

51   KHP_51                           active   

52   MOVO_52                          active   

53   PVK_53                           active   

54   SAS_54                           active   

VLAN Name                             Status    Ports

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

55   SVAS_55                          active   

56   VOSS_56                          active   

57   VP_57                            active   

58   SCVK_58                          active   

59   CC_59                            active   

60   1SCV_60                          active   

100  CSHB_100                         active    Po10, Po14, Po18

110  CSLM_110                         active    Po21, Po23, Po25

120  CSEX_120                         active   

130  FGHB_130                         active    Gi1/0/45, Gi1/0/46, Gi2/0/45

                                                Gi2/0/46

200  internet_200                     active    Gi1/0/47, Gi2/0/47

300  FR_300                           active   

999  VLAN0999                         active   

1002 fddi-default                     act/unsup

1003 token-ring-default               act/unsup

1004 fddinet-default                  act/unsup

1005 trnet-default                    act/unsup

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

But in running-config and startup-config I have only this

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

interface Vlan1

no ip address

!

interface Vlan30

description ***Trunk to Teplice***

no ip address

!

interface Vlan40

ip address 172.30.250.30 255.255.255.0

!

interface Vlan100

no ip address

!

interface Vlan300

description *BT-InfoNet*access to FR

no ip address

!

interface Vlan999

no ip address

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

where are the others vlan?

thank you

Everyone's tags (2)
2 ACCEPTED SOLUTIONS

Accepted Solutions

Vlan missing in running-config

The vlans that have interfaces assigned are considered L3 SVIs. Whenever a vlan is created, it doesn't create the SVI automatically because the vlan is considered L2. When you create the vlan, you can create an interface to attach to it which in turn creates the L3 SVI. You can create an interface that points to a non-existent vlan, but the vlan will show down/down until the L2 vlan is created.

HTH,

John

HTH, John *** Please rate all useful posts ***
VIP Super Bronze

Vlan missing in running-config

If you just create layer-2 vlans and you are in vtp server or client mode than sh run does not display the vlans

see this link:

http://www.cisco.com/en/US/products/hw/switches/ps5213/products_tech_note09186a0080a49dbf.shtml

HTH

4 REPLIES

Vlan missing in running-config

The vlans that have interfaces assigned are considered L3 SVIs. Whenever a vlan is created, it doesn't create the SVI automatically because the vlan is considered L2. When you create the vlan, you can create an interface to attach to it which in turn creates the L3 SVI. You can create an interface that points to a non-existent vlan, but the vlan will show down/down until the L2 vlan is created.

HTH,

John

HTH, John *** Please rate all useful posts ***
VIP Super Bronze

Vlan missing in running-config

If you just create layer-2 vlans and you are in vtp server or client mode than sh run does not display the vlans

see this link:

http://www.cisco.com/en/US/products/hw/switches/ps5213/products_tech_note09186a0080a49dbf.shtml

HTH

Purple

Re: Vlan missing in running-config

Reza gave you the answer , your switch is either vtp server or client mode .  If it was in tranparent mode the l2 vlans would show in the config.

New Member

Saw this on a 3650 - except

Saw this on a 3650 - except it only applied to VLAN's with a low number (seemed to be sub-1000) and VLAN's above that appeared fine in the running config! Go figure

Going to VTP transparent mode fixed it totally

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