In order to migrate to a new rack inside the datacenter I have to replicate the VLAN setup between a Cisco Switch and a Dell PowerConnect Swithch.

On the Dell Switch I have 2 VLANs :

vlan 10 : WAN vlan 20 : MGMT

On the Cisco Switch i have created the same VLANs and set up different port range

vlan10 : Ports 1-12 vlan20 : Ports 13-24

Like this example:

interface gigabitethernet2                            
switchport mode access
switchport access vlan 10

The Cisco and the Dell switch are patched like this :

Dell (Port 13) ---> Cisco (Port 1)  - VLAN 10
Dell (Port 22) ---> Cisco (Port 13) - VLAN 20

Here are the port configs CISCO side :

interface gigabitethernet1
switchport trunk native vlan 10
interface gigabitethernet13
switchport trunk native vlan 20

And on the DELL SIDE:

interface gigabitethernet1/0/13
 switchport access vlan 10
interface gigabitethernet1/0/22
 switchport access vlan 20

Now, i can ping anything that is on vlan20; but cannot ping anything on the vlan10. I'm pulling my hairs out; what is wrong here ?

  • 1
    I just replicated your topology in the lab, I have a powerconnect 8024 and a Cisco 4948 connected with two Cat6 cables. I put one set or ports in access vlan 10 on both sides, the other ports in access vlan 20 on both sides. Then I added interface vlan 10 and interface vlan 20 with different IPv4 subnets assigned to each vlan. I have no problems pinging between those two vlan interfaces on the Cisco and PowerConnect – Mike Pennington Jun 29 '12 at 19:05

You don't need trunking at all - the two VLAN's are running on separate cables and you aren't using 802.1q on the Dell side.

The same commands you're using on the Dell (switchport access vlan xxx) will work on the Cisco side as well, as the syntax is actually derived from (read: copied) Cisco.

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Configure the Cisco side just like the dell side. Instead of switchport trunk native vlan 10 use switchport access vlan 10 and switchport mode access. If you wanted to trunk the VLANs you would use a single cable and run both VLANs across that cable. This configuration is just a couple of access ports.

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  • thanks; i think i've tried that already but didn't work; and in order to use a trunk; do i have to setup the port as a trunk on both switches ? – Disco Jun 29 '12 at 16:36
  • yes that is correct. if you wanted to trunk you would set switchport mode trunk and then switchport trunk allowed vlan 10,20 on both switches. – resmon6 Jun 29 '12 at 16:43
  • I've tried as suggested; both sides on port 13(Dell) and 1(Cisco); it won't let me do it, after a few seconds i get : %CDP-W-NATIVE_VLAN_MISMATCH: Native VLAN mismatch detected on interface gi1 (on the cisco) – Disco Jun 29 '12 at 16:58
  • and for some reason i see : "%LINK-I-Up: Vlan 1" when I enable the trunk on port 1 (cisco side) why the hell Vlan 1 here ... – Disco Jun 29 '12 at 17:00
  • @Disco - You need switchport trunk native vlan 10 on the port. By default, the native VLAN is 1 on the Cisco switch. Otherwise, you would want to specify the native VLAN as 1 on the Dell as well for that to work as is (10 and 20 would then be allowed). The important piece of info to know is that when you set up a trunk link, it runs several VLANs over that same link between the switches. – Paul Kroon Jun 29 '12 at 17:18

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