Unable to have 2 active vlan on Cisco 2950.

[JHVindasC]

Hello all,

I'm trying to configure some vlans on a 2950 we have in the office.

It has some old configuration and I don't want to delete it, it shouldn't give me problems at all.

Now, I have vlan 100 and vlan 115, if I decide to issue the command "no shutdown" for the vlan 100, it goes up but the vlan 115 goes down. 

Same happens if I issue the command on the vlan 115, vlan 110 goes down.

Any of you have an idea of what could it be the cause of this?

Thanks in advance.

[Georg Pauwen · Accepted solution]

Hello,

that is, unfortunately in your case, how the 2950 is designed. You can only have one interface, typically used for management, active at the same time on the 2950...

[JHVindasC]

Makes sense since I wasn't able to mantain both interfaces active at the same time lol

Didn't know that about the 2950, thank you.

[thai46001]

I am having the same issue with not being able to have 2 vlans active on my 2950 lab switch, I am testing some configuration to role out changes into my production switch at work. But i cannot get 2 VLAN to come up in my 2950 lab switch running IOS code 12.1(19)EA1c, but on my production switch running IOS 12.2 both the vlans are up. Can I get some help on this? Please let me know if you would like the running config from both devices.

[Jhosbell Verdesca De Aguiar]

Are you talking about

conf t
vlan 100
shut

or about

interface vlan 100
shut ?

The 2950 switch will allow you have only one layer 3 interface with IP Address at the time.

[JHVindasC]

I'm talking about:

interface vlan 100

ip add x.x.x.x x.x.x.x

no shut

[Jhosbell Verdesca De Aguiar]

Yeah, that's one of the reasons those switches are called layer 2 switches. They don't have multiple Layer 3 interfaces.

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