VLAN NOT WORKING PROPERLY

Unanswered Question
Sep 7th, 2010

Hi ,

     I have two 3750 switch and one of them is core switch.The core switch is configured 14 VLAN.the 2nd l3 switch is connected with core switch by trunk mode.My all VLAN is working properly except VLAN 4.The problem is VLAN 4 it goes down and after 30/40 second it goes up.I tried but can't find out the problem so please help me out of this problem.


PPCL IS MY CORE SWITCH


i have attached my current config.

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madathilsiva Tue, 09/07/2010 - 04:58

Hi,

Can u please clarify about the qurey. ie what's happening with you network.

Is that int vlan 4 is going down or VLAN 4 itself disappering?


What are the nodes connected with VLAN 4?



Regards,

Sivaprakash

Bangalore

Nagaraja Thanthry Tue, 09/07/2010 - 05:01

Hello,


When you say that the VLAN goes down, are you referring to Layer 3 interface

(interface vlan 4)? Can you please post the output of "show spanning-tree

vlan 4" command when the interface goes down? Most likely the interface goes

down when the trunks participate in spanning-tree recalculations.


Regards,


NT

Arup Dutta Tue, 09/07/2010 - 23:04

Hi ,

Thank you valuable support.

i have attach bot switch sshow spanning-tree and vlan id 4 status


please helpe me out i am waiting for your response


Thanking you,

Arup


On Tue, Sep 7, 2010 at 5:55 PM, ukglobecast <

Nagaraja Thanthry Wed, 09/08/2010 - 05:55

Hello,


Can you please post the output of "show interface gi 1/0/9 from L3SWPPCL

switch?


Regards,


NT

j-marenda Wed, 09/08/2010 - 06:29

Hi,


on the second switch, you have several SVI for several vlans without IP configured.


So IP-Processing is OFF.


I would reommende to either give thos vlans ip-adresses (and problably configure also hot standby)

or delete the svi interfaces

"int vlan 4; shut; exit; no int vlan 4"

This will not delete the Layer-2 vlan 4 , just the routed but not configured interface.


Hope this help's,


Juergen.

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