07-23-2007 07:41 AM - edited 03-05-2019 05:26 PM
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.
07-23-2007 07:45 AM
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.
07-23-2007 08:11 AM
but the switch accept ip address for vlan interfaces.
07-23-2007 08:13 AM
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.
07-23-2007 08:16 AM
thanks in understand now.
but there is no solution without change hardware?
07-23-2007 08:26 AM
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
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