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TOPIC: Packet Tracer- "Dark Green LED"

Packet Tracer- "Dark Green LED" 6 years 7 months ago #33623

  • prusso69
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I am wondering why I have dark green lights between one host and a port on the layer 2 switch. I have a network with vlans and intervlan routing. All other host attached to their respective vlans have the lighter green blinking lights and ping across the network. The one with the dark green light is very very sporadic. I can send the file as requested.

Thanks in advance
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Re: Packet Tracer- "Dark Green LED" 6 years 7 months ago #33636

  • S0lo
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Yes, posting a link to the pkt file would surely help us understand better. You could use www.2shared.com or whatever.
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Ammar Muqaddas
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Link to PT file 6 years 7 months ago #33640

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Solo,

Here is the link to my problem file. Please reference the link attached between the host and the switch on vlan 203.

www.2shared.com/file/11326118/f41a2409/Case_Study.html

Thanks in advance.
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Re: Packet Tracer- "Dark Green LED" 6 years 7 months ago #33645

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Here is the fixed file:

www.2shared.com/file/11342814/f25f315a/Case_Study_fixed.html

The switches were all put into VTP server mode, only one switch should be server and rest are clients. I've done the following on one of the switches:

[code:1]vtp mode server[/code:1]

Then all other switches would have:

[code:1]vtp mode client[/code:1]

I also defined a VTP domain name (DOM1) on the server switch:

[code:1]vtp domain DOM1[/code:1]

It worked after that.

By the way, there seams to be other problems, for example VLAN99 is assigned to have different IPs in the two layer 3 switches. I would suggest you assign the IP of the VLAN only on one of the switches and leave the other.

Tel us if you need further help.
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Ammar Muqaddas
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Re: Packet Tracer- "Dark Green LED" 6 years 7 months ago #33646

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Thanks Solo,

Does VTP on the switch default to server mode? I have not done anything with VTP yet.

I have the vlan99 on two separate subnets because the link between the two layer 3 switches is a routed link. I was told that if the link was routed that you had to have them on separate subnets. If the link was a trunk then they could be on one subnet. The link between the L3 switches and going upward, is all in the OSPF area according to my case study.

Thanks again for your help.
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Re: Packet Tracer- "Dark Green LED" 6 years 7 months ago #33652

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Does VTP on the switch default to server mode?

It seams so.
I have the vlan99 on two separate subnets because the link between the two layer 3 switches is a routed link. I was told that if the link was routed that you had to have them on separate subnets. If the link was a trunk then they could be on one subnet. The link between the L3 switches and going upward, is all in the OSPF area according to my case study.

You're right, I did not realize that it's a routed link. Still, as far as I know, a VLAN is essentially a single subnet. Meaning that all traffic within hosts in that VLAN is not routed, i.e it should not get passed layer 2 switching. For example, when you ping PC4 from PC5, it will work in your configuration, but if you trace the packet (in simulation mode) you will find that it passes through the routed link, although they are in the same VLAN!!.

Again, I'm not saying this will not work. I'm saying it's not meant to be this way. Besides, you might run into some trouble when you start defining sub-interfaces on routers (router on a stick). Two sub-interfaces might need to be defined for the same VLAN ID, which is not possible.

But don't take my words for it, trying and experimenting weird things is a great way to learn ;)
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