Cisco C1300 and Dell 6224 switch problem with untagged traffic and general mode

Hi,

Based on the guide here: https://www.dell.com/support/kbdoc/en-sg/000121373/how-to-use-general-switchport-mode-on-dell-networking-powerconnect-switches there might be a network configuration issue with the native VLAN. 

Based on your interface configuration, you might need to add:

interface TenGigabitEthernet1/0/21
 speed 1000
 description UPLINK
 switchport mode general
 switchport general allowed vlan add 150 tagged

 switchport general allowed vlan add 1 tagged
 switchport general allowed vlan add 51 untagged  
 switchport general pvid 51

Still not working. I tried your adivse also only VLAN150 working.

Cisco configuration:
interface TenGigabitEthernet1/0/21
speed 1000
description UPLINK
switchport mode general
switchport general allowed vlan add 150 tagged
switchport general allowed vlan add 1 untagged

Also tried with this configuration on cisco site:
interface TenGigabitEthernet1/0/21
speed 1000
description UPLINK
switchport mode trunk
switchport trunk allowed vlan 1,150   /   switchport trunk allowed vlan 150
switchport trunk native vlan 1

Dell configuration 9 (VLAN1 was indeed allowed as untagged, but as you advised, I removed it):
int eth 1/g21
switchport mode general
switchport gen allow vlan add 150 tagged
switchport gen allow vlan add 51 untagged
switchport general pvid 51

In summary, only traffic in VLAN150 is still working, while traffic in VLAN1 is not.

Rest related configuration:
vlan 150
!
interface vlan 1
ip address 192.168.51.233 255.255.255.0
no ip address dhcp
!
interface vlan 150
name MGMT
ip address 192.168.150.60 255.255.255.0
!
ip default-gateway 192.168.51.5
ip default-gateway 192.168.150.5

To allow untagged traffic (default VLAN) and tagged VLANs (e.g., VLAN 10) on the same port you would need to runt he following;

interface ethernet 1/gX
 switchport mode general
 switchport general allowed vlan add 10 tagged
 switchport general allowed vlan add 1 untagged
 switchport general pvid 1

• VLAN 1 is the default VLAN for untagged traffic.
• Tagged VLAN 10 is explicitly allowed.
• The PVID ensures untagged ingress traffic is assigned to VLAN 1.Note: Replace 1/gX with the actual interface number.

Verify Cisco C1300 Port Configuration:

• Ensure the Cisco port is set to trunk mode with native VLAN 1 (or matching the Dell PVID).
•  
•  
• Example:
• interface GigabitEthernet0/1
   switchport trunk encapsulation dot1q
   switchport mode trunk
   switchport trunk native vlan 1
   switchport trunk allowed vlan 1,10

Avoid Using Access Mode if Tagged VLANs Are Needed:

• • Access mode only supports one untagged VLAN and no tagged VLANs.

     

Test with Tagged and Untagged Devices:

• • Use a packet capture or VLAN-aware endpoint to verify tagging behavior.

Let me know if this helps.

But untagged traffic leaving Cisco from VALN1 is to be placed in VLAN51, which means that PVID51 (also general untagged shoud be 51 then?) should be on the Dell side? 

On the Cisco you would replace vlan 1 with vlan 51.

But the assumption is that VLAN1 should be there (the customer's idea), unless I could do it on VLAN2 as untagged, for example, so as not to use the default and leave it as it is now on the Dell side?

Hi,

By default, VLAN 1 is native VLAN (Untagged VLAN) on 6224. Instead of using VLAN 51 as native VLAN. Make VLAN 1 as native VLAN. 

Hence you can try:

interface TenGigabitEthernet1/0/21
speed 1000
description UPLINK
switchport mode general
switchport general allowed vlan add 150 tagged
switchport general allowed vlan add 51 tagged
switchport general allowed vlan add 1 untagged
switchport general pvid 1

@DELL-Joey C​ but my cisco switch is unaware of the existence of VLAN51. I have the rest of the configuration done as you say.

Hi,

With the command that I've provided above, 6224's native VLAN as become VLAN1. VLAN51 has been removed hence the CISCO switch will no longer be aware. (Sorry for the confusion reply above, as I was checking the configuration with the previous). I'm unsure the reason that you have configured VLAN51 as native. 

@DELL-Joey C​ It is set to Dell PVID 51 because when traffic comes from Cisco with VLAN1 (untagged), Dell is supposed to put it in VLAN51 and continue tagged to the firewall subinterface. Now I'm thinking that maybe VLAN 51 should be tagged on the Dell?

This is up to date:
Cisco configuration:
interface TenGigabitEthernet1/0/21
speed 1000
description UPLINK
switchport mode general
switchport general allowed vlan add 150 tagged
switchport general allowed vlan add 1 untagged

Dell configuration:
int eth 1/g21
switchport mode general
switchport gen allow vlan add 150 tagged
switchport gen allow vlan add 51 untagged
switchport general pvid 51

Hello, the Dell port is set with PVID 51 to map untagged traffic from the Cisco into VLAN 51, which is then forwarded to the firewall.

If the firewall expects VLAN 51 to be tagged, then yes  VLAN 51 must be tagged on the Dell port

@DELL-Marco B​ A funny solution to the problem – the customer didn't connect the VLAN, but insisted that he had :D