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The IP is full on VLAN

i have two vlans, vlan3 and vlan12 , I use 250 IP on vlan3, and i want to add new CISCO Switch 2950-48 port on vlan3, by free port, how can get new ip and what is the good configuration on the switch? and can i use the vlan12 on vlan3 and how?

The connection between VLAN3 and VLAN12 is CISCO ROUTER.



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Rick_O_Shay
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If the 10.10.3.X subnet has a 24 bit mask, 255.255.255.0, then you don't have room to expand it and will need to add a new subnet on the router like 10.10.4.X. If the mask is 23 bits or less then you can continue assiging addresses from it. Either manually or via DHCP whatever you are using now.

You can't really use VLAN 12 on the new switch at that location because it is already in use with the 10.10.12.X subnet across the router at the other building.
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Do you actually have 250 of the 254 IP addresses  in use, or is that just the possible IP address you can use?

As for the config for he new switch, it should be pretty much like the other 5 current switches in VLAN3.  All that really needs to be unique is the switch name and the management IP address.


To get additional IP space on a existing VLAN you can add a secondary IP address range to the
layer 3 interface. So, multiple IP ranges can operate out of the same vlan.

harbor235 ;}
Provided that 10.10.2.0 is not in use, one option would be to change the mask to 255.255.254.0  which would change the address range to include 10.10.2.0 - 10.10.3.255
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i already use 250 of the 254 IP addresses on VLAN3>>>

Is there any config on new switch to get the free IP on VLAN12 like 10.10.12.xxx
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giltjr
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Which Cisco router do you have?

C6509
O.K., I would create a new VLAN and use it instead of attempting to extended VLAN12 between the two buildings.
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ASKER

good
 
i do this config on the port 0/24 of switch which connected to the router.

switch:
int Fas 0/24
 switchport trunk allowed vlan 1,5
 switchport mode trunk
 load-interval 30
 spanning-tree portfast trunk

and i config the new switch like this>>

switch:
int Fas 0/24
 switchport mode trunk
 spanning-tree portfast trunk

and worked very well

BUT>

when i try to do the same config to new switch on another vlan, i can not get ip
How is the new switch connected?

Is it connected directly to your 6500?  If so, did you make the port it connected to a trunk port?
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The new switch connected to the another switch which is connected directly to 6500 by Fiber ...

and i make the connect between the switches trunk port.
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