Cannot Ping VLAN

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Dec 12th, 2008
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I have a core stack made up of 2 12Port Fiber Cisco Switches that are -E a 24-Port 3750-E and a 48 Port 3750.

The 24-port 3750 is my Master. I have setup all of my VLAN's and VTP on it. I have a VLAN1 that is and a VLAN16 that is when I had a port to VLAN16 I can't ping that device nor can i ping from anywhere but the fiber switch. What could I have left off?

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viyuan700 Fri, 12/12/2008 - 20:02
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For inter vlan communication you have to configure routing on ur switch if it is layer 3 or connect to a router.

amjbmr808 Sat, 12/13/2008 - 05:19
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Ok thanks. I have a new question. I have another exact setup just like this on another network. How can I tell what routing protocol the core stack is using so i can make this one the same?

Pari Thiagasundaram Fri, 12/12/2008 - 21:25
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Do you have atleast one trunk port connecting these 2 switches ?

Try pinging from the device to 16.1 ip address.

Hope you have gw configured on your PC connected to vlan 16.

amjbmr808 Sat, 12/13/2008 - 05:21
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I am a little confused. I need a trunk port on the switches even though they are a stack and the clients are both on this stack?

infosankar Sat, 12/13/2008 - 03:05
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Make sure that VLAN16 is Up or not. By that you can find the root cause of this issue.

allan.thomas Sat, 12/13/2008 - 03:07
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Hi Andy, here are a few aspects with which to check:-

1. Have you configured the command 'ip routing' from global? This is required for inter-vlan routing.

2. The particular Switchport has the commands 'switchport mode access' and 'switchport access vlan 16'.

3. Have you added the VLAN to the respective trunk ports between the Core Stack and either of the 3750s? Or was the link simply an access port as you were only using the default VLAN? If this is the case then you would need to configure a trunk between these devices.

4. Ensure that you do not have a personal firewall enabled on the the device, which could be blocking icmp.

4. The device has the DG of and a valid IP address/Mask.

Hope this helps.


amjbmr808 Sat, 12/13/2008 - 05:23
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I appreciate the detailed and quick response. I have checked all that you listed. The only question i have is on #3. The 3750 is part of my core stack so do i actually need trunk ports? I don't now since it is part of the stack.


viyuan700 Sat, 12/13/2008 - 05:59
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is it possible for you to post sh run

gagamboy15 Tue, 12/16/2008 - 00:45
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Since this is part of the stack no need for trunking, issue intervlan routing (ip route or ip default gateway commands).

Please correct me if I am wrong. :-)




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