topic Re: LAG vlans and core port vlans in ExtremeSwitching (VSP/Fabric Engine)

LAG vlans and core port vlans

ExtremeNewbie — Tue, 04 Feb 2025 13:57:14 GMT

Hello Everyone,

Quick question - I have come across a couple of LAGs on my 8400c switch. I can see the vlans associated with the lags.

However, on the uplink port to the core switch, the vlans are not the same as the LAG vlans.

Can anyone help me understand why this would be as I would expect the all LAG vlans to be available via the uplink core port?

Thanks,

Re: LAG vlans and core port vlans

WillyHe — Fri, 07 Feb 2025 10:27:03 GMT

Hello Asifi,

You are not providing much of information but what you see can be explained when your VSP8400C switch is up-linked to a SPBM backbone, then you will only find two VLAN's configured on the NNI backbone uplink port(s), these two vlan's are used exclusively used by SPBM and cannot be used for CNI client traffic.

It looks like you are new to "VOSS/FABRIC ENGINE", in that case I recommend to read some manuals to understand how SPBM works and how it can make your life very simple.

Re: LAG vlans and core port vlans

ExtremeNewbie — Fri, 07 Feb 2025 13:43:20 GMT

Hello WillyHE,

Thanks for the reply and apologies. My initial question with ALL the config got rejected because someone thought it was spam! We have SPBM in place so that's ok as you said it make's your life easier.

Let's see if this is blocked as spam or not.

So I have 2 port channels.

Port channel 1 vlans are 10, 20, 30, 40, 50 ,101

Port channel 2 vlans are 10, 20, 30, 40, 50, 102

The above port channels are on HP switches. 2 HP switches on each side in a stack.

On the Extreme core switch side, I can see the uplink from the HP switches to 2x Extreme core ports that are in LACP.

When I look at the details for each port on the core switch, I would expect to find the same vlans as on the HP port channel.

Instead, I only see a couple of vlans, 1 and 101 and 1.102 on each core switch respectively.

My question is should the HP port channel vlans and the Extreme core switch vlans be identical?

My initial feeling is yes they should be or else where would the traffic for vlans not present go?

I hope this explains this a bit better.

Thanks,

Re: LAG vlans and core port vlans

ExtremeNewbie — Fri, 07 Feb 2025 14:28:19 GMT

Hi WillyHe,

I did initially add in all the details and the reply got rejected as spam. I replied about an hour ago too and this to does not look to have gone through as I cannot see this on any replies I have sent.

Not sure what is happening.

I'll try again later.

Thanks,

Re: LAG vlans and core port vlans

WillyHe — Sun, 09 Feb 2025 09:23:46 GMT

Hello Asifi,

You can do "show interfaces gigabitEthernet vlan 1/5-1/10" with or without ports to see the vlan(s) assigned to a port.

Re: LAG vlans and core port vlans

ExtremeNewbie — Thu, 13 Mar 2025 11:12:18 GMT

@WillyHe - that's great. I can now see what is where and how.

Many thanks,