Dell S4112f-on to Aruba 2930m not routing?

Jaxon62,

 

The S4112F-ON runs Dell OS10, which uses a modular configuration model. Unlike Cisco IOS, OS10 does not always expose ip routing as a global command.

 

Routing is implicitly enabled when:

IP addresses are assigned to VLAN interfaces.

Static routes or routing protocols are configured.

 

However, if the switch is operating in Layer 2-only mode, or if the routing stack is not enabled, inter-VLAN or upstream routing will not function.

 

 

I would check the following

 

Use the following command to check if routing is active:

show ip route

If this returns no output or an error, the routing stack may not be initialized.

 

 

 

Enable routing by assigning IPs to VLAN interfaces:

interface vlan 10

ip address 192.168.10.1/24

no shutdown

 

Repeat for other VLANs as needed.

 

 

 

To allow the switch to reach external networks:

ip route 0.0.0.0/0 192.168.10.254

Replace 192.168.10.254 with the Aruba or Juniper gateway IP.

 

 

Ensure the uplink to Aruba is configured as a trunk:

interface ethernet1/1/1

switchport mode trunk

switchport trunk allowed vlan 10,20,30

 

Ensure matching VLANs are tagged on the Aruba side.

 

 

 

You can then use:

show vlan

show interfaces status

To confirm VLANs are active and interfaces are up.

 

 

 

If the switch is in SmartFabric mode, routing may be restricted. Ensure it is in Standard mode:

show system mode

If needed, convert to standard mode (note: this may require a reload and config loss).

 

 

 

Let me know what you see and if this helps.

 

@DELL-Chris H ​ 

Hi Chris,  Thank you for the response.

I am puzzled because the switch appears to work as L2 only in the current stack eg  Nutanix <> S4112f-on <> Dell X4012 <> Dell N3024 <> Juniper Router <> MPLS etc.

I copied the original Dell N3024 config to the Aruba 2930m as near as I could - and the routing settings are identical eg 0.0.0.0/0 to Juniper  and a Default gateway of the same for good measure...

However I have tried adding IPs to the VLANs which gave me show route results - still did not route me to the internet.

I came across a Route of last resort setting on the S4112 - I tried that via the VLAN 10 but it stoped pings on VLAN 10 address so I removed that - maybe I should try it on the Port or port channel...

I added to s4112 0.0.0.0/0 10.10.10.254 (Aruba IP) but it does not show up in Show ip route - the other entries of via s4112 IP show in ip route.

The connection between s4112 and Aruba is a trunk at both ends - I even used the original working port on the s4112 and created a matching port on the Aruba.  the interfaces show as UP

Show System Mode does not exist - there are various othe show system option and it appears Smartfabric is not enabled.  So i assume the switch is in standard mode.

Maybe it is something in  the Aruba config (as it is the new kid on the block) but in isolation the routes to the internet work...  

This whole thing is keeping me awake at night cos it should be soooo simple.

Thanks again

E.

Hi,

 

If you added the Aruba IP, and it's not showing in IP Route, it might be some misconfiguration. 

 

There is a need for the support to check on the configuration, do you plan to contact the network support team to clarify the configuration is correct? 

@DELL-Joey C​ 

Hi Chris

I contacted support and they do not do config checks , I was told to get a quote from my account manager :-( - 

I will be going back to the DC to try again on Tuesday, I will go through your check list again then. 

I will check and compare the configs again

Many thanks for your help, it is much appreciated.

E.

@DELL-Joey C​ 

Good afternoon

An interesting few days in the life of a Dell 4112f-on - I found some other "glitches" in configuring a switch that works in layer 2 until you need to route to the internet via another switch.   Ok:

I added Ip route 0.0.0.0/0 10.10.10.254 

I did show ip route - showed nothing

added an ip to a vlan 32 

Show ip route - showed a route to x.x.32.0 via x.x.32.246 (the switch) - still no ip route of 0.0.0.0/0

as this was a currently live switch I did not want to do too much --

Anyway I tried to add 10.10.10.246 to vlan 10 - this answered with "there is an ip address overlap with mgmt"  - ah ha a clue that had not shown up in any other attempts!

Mgmt oob was also in the 10.10.10.x range, supposedly allowed but not good practice... not so - the vlan could therefore not have a 10.10.10.x ip

Sooo, I changed the mgmt ip to 192.x.x.x

second attempt, add 10.10.10.246 to vlan 10 and hey presto

ip route now shows 0.0.0.0/0 10.10.10.254

and it  also shows it as gateway of last resort (default gateway - the missing command?)

Finally I could attach to the Aruba and pings and traffic flowed freely until.... the Junipers up stream started blocking alternately - so that's a whole other problem.

I hope this information helps other users of the S4112f-on OS10 switches.

Have an excellent day where ever you are.

E.