[c-nsp] VLAN disappeared

[Chris Griffin]

I believe there is a further limit when you enable SSH.  Its a 
combination of the number of trunk ports you have and the number of 
vlans you have.  If another trunk port came active would it try to kill 
off a vlan??
--
Chris Griffin                           cgriffin at ufl.edu
Sr. Network Engineer - CCNP             Phone: (352) 392-2061
CNS - Network Services                  Fax:   (352) 392-9440
University of Florida                   Gainesville, FL 32611

Vincent De Keyzer wrote:
> David,
> 
> thanks for the document for dummies.
> 
> Since this is a 2950, I am surprised to see that the limit is still 2950.
> 
> Two more questions then:
> 1) how do I know how many VLANs a switch supports? Is there a table
> somewhere on CCO that lists the max. number of VLAN per switch type, or do I
> have to dig the specs of each switch?
> 2) please confirm my understanding: when I do VLAN pruning on the trunk
> ports, the VLANs not listed as allowed (but present on the other switches of
> the VTP domain) will not enter the VTP database of the switch?
> 
> Vincent
> 
> 
> 
>>-----Original Message-----
>>From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
>>bounces at puck.nether.net] On Behalf Of David Prall
>>Sent: jeudi 22 septembre 2005 15:39
>>To: 'Vincent De Keyzer'; cisco-nsp at puck.nether.net
>>Subject: RE: [c-nsp] VLAN disappeared
>>
>>Vincent,
>>A number of the smaller switches have a 64 VLAN limit. What switch are you
>>using. On the trunk ports you might want to look at pruning all vlans
>>except
>>those that you require.
>>
>>2900XL
>>http://www.cisco.com/en/US/products/hw/switches/ps607/products_installatio
>>n_
>>and_configuration_guide_chapter09186a008007d32c.html
>>"A switch supports up to 64 VLANs"
>>
>>David
>>
>>--
>>David C Prall dcp at dcptech.com http://dcp.dcptech.com
>>
>>
>>
>>>-----Original Message-----
>>>From: cisco-nsp-bounces at puck.nether.net
>>>[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of
>>>Vincent De Keyzer
>>>Sent: Thursday, September 22, 2005 8:40 AM
>>>To: cisco-nsp at puck.nether.net
>>>Subject: [c-nsp] VLAN disappeared
>>>
>>>Hello,
>>>
>>>
>>>
>>>a VLAN disappeared from a switch this morning (obviously creating
>>>"side-problems").
>>>
>>>
>>>
>>>When I realised this and tried to put it back, here is what
>>>the switch told
>>>me:
>>>
>>>
>>>
>>>BRUBLUsw04#vlan database
>>>
>>>BRUBLUsw04(vlan)#vlan 828
>>>
>>>VLAN 828 added:
>>>
>>>    Name: VLAN0828
>>>
>>>BRUBLUsw04(vlan)#exit
>>>
>>>Proposed configuration has too many VLANs for this device's
>>>core memory
>>>
>>>resources.  Either reduce the number of VLANs proposed or use
>>>another VTP
>>>
>>>device to configure database.  (The latter will cause this
>>>device to enter
>>>
>>>TRANSPARENT mode automatically if propagated to it.)
>>>
>>>APPLY failed.
>>>
>>>Use 'abort' command to exit
>>>
>>>BRUBLUsw04(vlan)#
>>>
>>>
>>>
>>>So I looked up the VLAN, and found 204 that was not supposed
>>>to be there:
>>>
>>>
>>>
>>>BRUBLUsw04(vlan)#no vlan 204
>>>
>>>Deleting VLAN 204...
>>>
>>>BRUBLUsw04(vlan)#vlan 828 name BRUBLU
>>>
>>>VLAN 828 modified:
>>>
>>>    Name: BRUBLU
>>>
>>>BRUBLUsw04(vlan)#exit
>>>
>>>APPLY completed.
>>>
>>>Exiting....
>>>
>>>BRUBLUsw04#
>>>
>>>
>>>
>>>and everybody was happy again.
>>>
>>>
>>>
>>>Now, being infamously incompetent in layer2 switches (among
>>>other things), I
>>>have the following questions:
>>>
>>>What happened? Why did VLAN 828 suddenly disappear? If I turn
>>>this switch
>>>into a VTP client, and add VLANs on a VTP server, will this
>>>one be able to
>>>swallow all VLANs of the domain (at the moment, all switches
>>>in the VTP
>>>domain are servers)? Why would I want to have this switch
>>>VTP-transparent?
>>>How do I check the "core memory resources" consumption? etc.
>>>
>>>
>>>
>>>. in other words: please advise.
>>>
>>>
>>>
>>>Thanks in advance.
>>>
>>>
>>>
>>>Vincent
>>>
>>>
>>>
>>>
>>>
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>>>
>>
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> 
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