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Community Member

vlan down

hi,

i have a switch 2950.

i create 2 interface vlan (1 and 2).

the problem is when i do "conf t" , "interface vlan 1), "no shut" the int vlan1 is up but vlan2 is down.

and the same with int vlan2.

i dont know what's the problem.

why they can not be up in the same time.

5 REPLIES
Hall of Fame Super Bronze

Re: vlan down

You are creating two Layer3 interfaces and this switch is only Layer2, hence it's a limitation in the hardware.

However, you are allowed to create multiple Layer2 Vlans but in order to perform inter-vlan routing, you need a Layer3 device (router or switch) connected to both Vlans.

Community Member

Re: vlan down

but the switch accept ip address for vlan interfaces.

Hall of Fame Super Bronze

Re: vlan down

They do but those IP addresses will never become active if the interface is down/down.

That's how the hardware limit its use. Only one Layer3 up/up at the time.

Community Member

Re: vlan down

thanks in understand now.

but there is no solution without change hardware?

Hall of Fame Super Bronze

Re: vlan down

No solution without changing the hardware, that's correct.

If you need to play with inter-vlan routing at the switch level, the cheapest switch would be a 3560 compact switch (8 port model).

http://www.cisco.com/en/US/products/hw/switches/ps5528/index.html

and here is the current Cisco switch line

http://www.cisco.com/en/US/products/hw/switches/index.html

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