06-23-2012 07:36 AM - edited 03-07-2019 07:25 AM
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
Solved! Go to Solution.
06-23-2012 08:27 AM
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
06-23-2012 08:39 AM
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
06-23-2012 08:27 AM
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
06-23-2012 08:39 AM
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
06-23-2012 06:00 PM
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.
03-15-2017 05:46 PM
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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