Added vlan not working

[jeremy-rogers]

I am still using a 6509. I am trying to add a new vlan, but I can't even ping the router ip on that vlan from the router. I have configured it the same as my other vlans that work just fine. I am wondering if I have crossed some limit. I have my vlans setup as 1,100,200,300,400,500,600,700,800,900. Up not vlan 800 works just fine. VLAN 900 doesn't. I can't figure out what the problem is.  Below is my vlan configuration. Anything you see wrong?

interface Vlan900
 ip address 192.168.104.252 255.255.255.0
 ip helper-address 192.168.37.61
 no ip redirects
 ip pim sparse-dense-mode
 standby 90 ip 192.168.104.254
 standby 90 priority 105
 standby 90 preempt
 

[Zach Smith]

'show ip interface brief' show this as down?  You may try putting something in this VLAN to make the SVI active.  Perhaps add it to a trunk interface or temporarily put a port in access mode of this VLAN and connect a PC to it.  does that make it come up?

[jeremy-rogers]

status is up, but prot is down.

I have a pc connected, but it doesn't pull an IP address. Weird thing is that the router can't ping 192.168.104.252.

[Zach Smith · Accepted solution]

I assume 'show vlan' displays vlan 900?  i.e. you issued command 'vlan 900' on the 6509?  with the 6509 owning the gateway for vlan 900 it will need vlan 900 in the vlan db.  If you have an access port in vlan 900 on the 6509 - maybe put portfast on the port for testing - it should come up.  Maybe add it to a trunk to a downstream switch as well..?

[jeremy-rogers]

OK, that fixed it. I added a trunk port and a port on the downstream switch. Once I did that everything came up. Weird.

Thank you!