[c-nsp] 6500 admin shuts a new vlan if it has the same IP as a down vlan.

[Peter Rathlev]

On Wed, 2012-12-19 at 19:52 -0500, Drew Weaver wrote:
> You cannot un-shut the new VLAN until you remove the downed VLAN
> completely.
>  
> When we create the new VLAN we do 'no shut' and it gives an error
> about an overlap.

For me it does warn about the overlap, but as soon as I shut the old SVI
I can unshut the new one. I don't have to completely remove it.

> I'm doing all of this via scripts; so if the IP I am assigning isn't
> in the routing table and it isn't assigned in our database then that
> means I have no way of knowing that it's still pegged to a long
> forgotten vlan.
> 
> I'm almost certain that this is 'newer' functionality, like SXI5+

I tested what I think we're talking about on both SXD5 and SXJ3 with the
same result. On SXD5:

 RtrSXD5(config)#do show version | incl ^IOS
 IOS (tm) s72033_rp Software (s72033_rp-PSV-M), Version 12.2(18)SXD5, RELEASE SOFTWARE (fc3)
 RtrSXD5(config)#vlan 2,3
 RtrSXD5(config-vlan)#exit
 RtrSXD5(config)#interface Vlan2
 RtrSXD5(config-if)#ip address 10.0.0.1 255.255.255.0
 RtrSXD5(config-if)#no shutdown
 RtrSXD5(config-if)#interface Vlan3
 RtrSXD5(config-if)#ip address 10.0.0.5 255.255.255.0
 10.0.0.0 overlaps with Vlan2
 RtrSXD5(config-if)#no shutdown
 10.0.0.0 overlaps with Vlan2
 Vlan3: incorrect IP address assignment
 RtrSXD5(config-if)#do show running-config interface Vlan3 | include shutdown
  shutdown
 RtrSXD5(config-if)#do show running-config interface Vlan2 | include shutdown
 RtrSXD5(config-if)#interface Vlan2
 RtrSXD5(config-if)#shutdown
 RtrSXD5(config-if)#interface Vlan3
 RtrSXD5(config-if)#no shutdown
 RtrSXD5(config-if)#do show running-config interface Vlan2 | include shutdown
  shutdown
 RtrSXD5(config-if)#do show running-config interface Vlan3 | include shutdown
 RtrSXD5(config-if)#

And on SXJ3:

 RtrSXJ3(config)#do show ver | incl ^Cisco IOS
 Cisco IOS Software, s72033_rp Software (s72033_rp-ADVIPSERVICESK9-M), Version 12.2(33)SXJ3, RELEASE SOFTWARE (fc1)
 RtrSXJ3(config)#vlan 4,5
 RtrSXJ3(config-vlan)#exit
 % Applying VLAN changes may take few minutes.  Please wait...
 RtrSXJ3(config)#interface Vlan4
 RtrSXJ3(config-if)#ip address 10.0.0.1 255.255.255.0
 RtrSXJ3(config-if)#no shutdown
 RtrSXJ3(config-if)#interface Vlan5
 RtrSXJ3(config-if)#ip address 10.0.0.5 255.255.255.0
 10.0.0.0 overlaps with Vlan4
 RtrSXJ3(config-if)#no shutdown
 10.0.0.0 overlaps with Vlan4
 Vlan5: incorrect IP address assignment
 RtrSXJ3(config-if)#do show running-config interface Vlan5 | include shutdown
  shutdown
 RtrSXJ3(config-if)#do show running-config interface Vlan4 | include shutdown
 RtrSXJ3(config-if)#interface Vlan4
 RtrSXJ3(config-if)#shutdown
 RtrSXJ3(config-if)#interface Vlan5
 RtrSXJ3(config-if)#no shutdown
 RtrSXJ3(config-if)#do show running-config interface Vlan4 | include shutdown
  shutdown
 RtrSXJ3(config-if)#do show running-config interface Vlan5 | include shutdown
 RtrSXJ3(config-if)#

Maybe we're talking about different things. :-)

-- 
Peter