InterVLAN Routing w/ 3750 L3 Switch

IT Man

Greetings,

I hope I am posting this in the correct area. I do have my CCNA and I know that routing on the stick was the only VLAN routing that was discussed so here goes.....

I am having an issue with routing on my 3750 switch. I turned on routing with the "ip routing" command and confirmed it was enable by doing a "show run" command. I then created several VLAN's and assigned each of them an IP address and subnet mask. I then assigned the appropriate interfaces to the desired vlans. I did put in the "show vlan brief" command to confirm that the interfaces were in the correct VLAN's. At this point, I took a few workstations and assigned them a static IP in the same subnet as the VLANs they were attached too but I was unable to ping anything. When I ran the "show ip interface brief" command I saw all but one vlan read status up but protocol down. I am stumped and to why this occurred. I am hoping this is something simple that I overlooked. Any assistance or suggestions would be very appreciated.

Thanks

tech-airman

IT Man wrote:

Greetings,

I hope I am posting this in the correct area. I do have my CCNA and I know that routing on the stick was the only VLAN routing that was discussed so here goes.....

I am having an issue with routing on my 3750 switch. I turned on routing with the "ip routing" command and confirmed it was enable by doing a "show run" command. I then created several VLAN's and assigned each of them an IP address and subnet mask. I then assigned the appropriate interfaces to the desired vlans. I did put in the "show vlan brief" command to confirm that the interfaces were in the correct VLAN's. At this point, I took a few workstations and assigned them a static IP in the same subnet as the VLANs they were attached too but I was unable to ping anything. When I ran the "show ip interface brief" command I saw all but one vlan read status up but protocol down. I am stumped and to why this occurred. I am hoping this is something simple that I overlooked. Any assistance or suggestions would be very appreciated.

Thanks

IT Man,

Did you verify that the access switchports aren't in a "shutdown" state?

APA

show vlans

if the vlans haven't been created in the vlan database the SVI's are always going to be up/down...........

use 'vlan (ID)' in global config mode to enter the VLANs into the VLAN database..... Give them a name as well so easy to distinguish when you do use the show vlans



Hope this helps

IT Man

tech-airmain

The switchports are not shutdown.

a.p.a.

Here is a copy of the config I used to create the vlans:

conf t
vlan 10
name Student
exit
vlan 20
name Staff
exit
vlan 30
name Server
exit
vlan 40
name Admin
exit
vlan 50
name Pseudo-Net
exit

rossonieri#1

hi it man,

did you have cables plugged to the switch?

Chris Knight

Any chance that you didn't set the default gateway correct to the SVI address on the hosts?

Any access lists preventing echo requests?

APA

so you have SVI's matching those very VLAN's right???

eg

interface vlan 10
desc ***Student**
ip address 10.10.10.1 255.255.255.0
no shut
!
interface vlan 20
desc ****Staff*****
ip address 10.10.20.1 255.255.255.0
no shut

IP addressing is just for explanation purposes........ Can you show your interfae config as well..... VLAN database config looks fine......

Chris Knight

Are the hosts using windows xp by any chance? Make sure that stupid firewall is turned off or you allow the echo requests to come through.

waru

Hi IT man,

Can you post the config for the switchports themselves?

Cheers
waru

IT Man

Greetings All,

I am sorry for not replying sooner as I was at work when I sent my original question and was unable to respond. I just ended up deleting and adding the VLANs all back again and for some reason, this time it worked. I assume I must have missed a step in the config somewhere. I just wanted to thank you all for taking the time to offer your wisdom. I am pretty new to the site but it does seem like a nice place to get some information when needed.

Thanks again,