Max2042
1 Copper

s4148F interswitch traffic within vlan with VLT

Hi,

 

I've set up 2 s4148F's with a VLTi and there are several machines connected with LACP across both switches. So far that's working fine.

Now I'd like to add a non-LAG connection on both switches so 2 devices can talk with each other in their own vlan, like this:

device A <--> (untagged port vlan 100) switch B <-VLTi-> switch C (untagged port vlan 100) <---> device D

in this setup, A and D can not reach each other. I suspect this is because the VLTi can only carry port channel traffic and I'm not setting up a LAG here so I'm not configuring these ports to be in a port-channel.

I have a 100g connection between switch B and C, which is in use for the VLTi. It's not allowed to change the port configuration to trunk, because the VLTi usage won't allow it.

How can I get device A and B to talk with each other?

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4 Replies
Moderator
Moderator

Re: s4148F interswitch traffic within vlan with VLT

Hi,

Is the VLT link configured to pass VLAN 100? Everything that I have been able to find does talk about it with port channels so that may be the case.

Thanks,
Josh Craig
Dell EMC Enterprise Support Services
Get support on Twitter @DellCaresPRO
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Max2042
1 Copper

Re: s4148F interswitch traffic within vlan with VLT

Hi Josh,

The interfaces that the VLT runs over can't be configured to allow vlan 100:

sw-06-of01(config)# vlt-domain 1
sw-06-of01(conf-vlt-1)# show configuration
!
vlt-domain 1
 discovery-interface ethernet1/1/25-1/1/26
 peer-routing
sw-06-of01(conf-vlt-1)# exit
sw-06-of01(config)# interface ethernet 1/1/25
sw-06-of01(conf-if-eth1/1/25)# show configuration
!
interface ethernet1/1/25
 description "VLTi crosslink to sw-07.of01"
 no shutdown
 no switchport
 mtu 9216
 flowcontrol receive off
sw-06-of01(conf-if-eth1/1/25)# switchport trunk allowed vlan 100
% Error: vlan100, Interface being added (to VLAN) is not in switchport mode trunk!.
sw-06-of01(conf-if-eth1/1/25)# switchport mode trunk
% Error: Discovery Interface mode must not be in switchport mode!.

I am wondering what the best practice setup is for these kinds of situations to enable this normal type of traffic to flow through?

 

Thank you,

 

Max

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Highlighted
Moderator
Moderator

Re: s4148F interswitch traffic within vlan with VLT

Can you private message me the service tag?

Thanks,
Josh Craig
Dell EMC Enterprise Support Services
Get support on Twitter @DellCaresPRO
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sphere011
1 Copper

Re: s4148F interswitch traffic within vlan with VLT

Hey there, We are also intersted in this - could you pls share your workaround? Cheers
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