two vlan in a switch not communicating

Unanswered Question
Apr 9th, 2010

hi frnds

i took a switch erased the old configurations and configured two different vlan 100, 101, i named the vlans but if i give no shutdown to the interface the vlan are still in shutdown mode..i dont know whats missing can anybody help


I have this problem too.
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Leo Laohoo Fri, 04/09/2010 - 16:23

Catalyst 2900XL/3500XL, 2940/2950 switches will allow only ONE active VLANs at any one time.  Understand that IP address on the VLANs are purely for management purposes.

What are you trying to achieve?

karthikeyan gop... Fri, 04/09/2010 - 16:28

create two vlan in the switch ...connect two servers with ip

address of the vlan network for example

if vlan 100 is  one of the server will have the gateway with this address..same for the second vlan ..

like vlan 200 and second server will have the gateway withi this address..both the server will connect to this switch and they can communicate with each other..literraly we want two server two communicate with each other with this switch...

Leo Laohoo Fri, 04/09/2010 - 16:35

Ok, So you want to both VLANs to communicate with each other.  What is the model of your switch.  In order to configure inter-VLAN routing you need a layer3 appliance like a Layer 3 switch or a router.

Federico Coto F... Fri, 04/09/2010 - 17:29

The 2900 series switches are Layer 2 switches which cannot perform inter-VLAN routing.

The 2600 are routers. This devices routes traffic from one interface to another.

As mentioned above, you need either a router or a Layer 3 switch to route between VLANs.


Leo Laohoo Fri, 04/09/2010 - 17:33

I doubt.  Inter-VLAN routing requires FastEthernet connection.  Plain 2600 router only have Ethernet connection.  (2600XM have FastEthernet.)

However, there were some mention that the later IOS for the 2600 with Ethernet now support inter-VLAN routing but I'm unable to determine the veracity.

Configuring InterVLAN Routing and ISL/802.1Q Trunking on a Catalyst 2900XL/3500XL/2950 Switch Using an External Router

How To Configure InterVLAN Routing on Layer 3 Switches

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CSCO11584685 Sat, 04/10/2010 - 00:14

here is a solution.

why not use router on a stick. connect ur ethernet cable from switch to router.

configure the switch port to use trunk.

configure the router port to use multiple sub-interfaces. and create two sub-interfaces each belonging to different subnet (vlan 100, and 101).

this should work by theory. im not sure bout hardware limitation or ios limitation issues. but the concept works.


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