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New Member

VLAN DB disappearing on reboot

Hello experts,

I have a 3825, running 12.4(22)T (c3825-ipvoicek9-mz.124-22.T.bin). The chassis has the following modules:


WIC-1DSU-T1-V2

VIC2-2FXO

PVDM2-8

NM-16ESW

PPWR-DCARD-16ESW

NME-WAE-502-K9

This unit is in a small branch office, and there is no other switch in the network, just the module on this router. The switch module was configured to use VTP v2, it was a VTP server, & the domain was set. There were a few VLANs added. Each time the router reboots, or loses power, all VTP & VLAN info is lost. A quick Internet search did not return any results regarding this issue. Any idea why this is happening?

For now, I have moved it to VTP transparent as a work around to see if that fixes it. Just curious if any one else has seen this, or knows what the cause might be.

Thank you,

Drew

1 REPLY
New Member

Re: VLAN DB disappearing on reboot

The powers that be need to add my hardware/software config to the following bug id:

http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCsz52576

CSCsz52576 Bug Details
vlan.dat file lost after second power cycle - VTP Domain Name disappears.
Symptoms: The vlan.dat file gets deleted after the second reload of the
router, and the VLAN definition and names are lost (not the interfaces and IP
addresses). It has been observed that when the vlan.dat is lost, in "sh vtp
status" the VTP Domain Name is blank (and was properly configured before).

Conditions: This behavior is observed in a Cisco 3270 router that is running
Cisco IOS Release 12.4(24)T. It is also observed with Cisco 1800 ISR with
switch modules in Cisco IOS Release 12.4(22)T.

Workaround: There is no workaround. Customer needs to reconfigure them again
after reboot. This problem is not observed in Cisco IOS Release 12.4(15)T.

Further Problem Information: When a customer is running an image that does not
store the VTP and VLAN information in the start-up configuration or the normal
output of show running-config, the vlan.dat file gets overridden to the default
vlan.dat approximately 2 minutes after reboot. The current VLANs and VTP
information remains operational until the router is rebooted.

A reboot causes the VLANs and VTP information to disappear because the start-up
configuration does not contain any VLAN or VTP information, nor does the
vlan.dat file in flash.

The operating VTP information appears in the output of show running-config all
(which shows non-default and default values), indicating that the router
considers the VTP information to be at default values even when there is a VTP
domain name configured. This allows the VLANs and VTP to remain operational
until the router is rebooted.

This status of this bug is fixed. The problem described in the bug report is "fixed-in" all release versions targeted to be fixed, and all changes have been successfully tested.

Fixed-In
15.0(1)M
12.4(24)T1
12.4(22)T2
12.4(24.6)PI11j
12.4(24.6.5)PIL12
12.4(22)MDA1
12.4(24)YG
12.4(24.6.5)PIB12
12.4(24)GC1
12.4(22)XR
12.4(24)MD
12.4(24.6)M0.1
12.4(22)YE2
15.1(1)XB
12.4(24)YE
15.1(1.5.1)PIA13
15.1(1.7.1)PIA13
12.4(24)GC2
12.4(24)MDA1

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