topic Re: S-Tag over VOSS Fabric using VSP 7400 Switches in ExtremeSwitching (VSP/Fabric Engine)

S-Tag over VOSS Fabric using VSP 7400 Switches

Ashlee_Smith — Mon, 03 May 2021 20:52:30 GMT

Hi All

TLDR: We cannot get S-Tag vlans to pass over the Fabric between our two VSP 7400 switches.

We have the following deployed in our network;

2 x Extreme VSP 7400 Software version 8.0.5.1

These are joined by two 100Gb cables.

ISIS is enabled

ISIS Spbm 1

The Fibre provider port is Flex-uni enabled and Encapsulation Dot1Q

The Router uplink is Flex-uni enabled and Encapsulation Dot1Q

As a side note we tried removed Encapsulation Dot1Q and it made no difference.

Scenario:

We have a fibre provider that is handing services over as S-Tags.

Currently over this setup we are able to pass C-Tags but cannot pass S-Tags.

We can learn MAC address entries when using S-Tag on both switches across the I-SID but not on the edge devices these VLANS terminate onto.

Configuration we tried to get it working:

Switch 1 - Where fibre provider plugs into

Create I-SID 1000

c-vid 1000 port 1/1 (Fibre provider)

Switch 2 - Where the uplink Router plugs into

Create I-SID 1000

c-vid 1000 port 1/5 (uplink to Router)

This does not work unfortunately, if we drop the S-Tag identifier we can learn MAC addresses and push L3 traffic across.

Things we have tried alternative to config changes:

Deployed additional 2 x Extreme VSP 7400s and upgraded them to Software version 8.3.0.0

Even on this version we cannot get it working.

I have followed this thread and downloaded the PDF and according to that we are doing everything correctly:

Re: S-Tag over VOSS Fabric using VSP 7400 Switches

Roger_Lapuh — Tue, 04 May 2021 15:00:02 GMT

Did you make sure the Ethertype of the QinQ packet is 0x8100, so that the VSP can see this packet as a tagged packet? Thanks Roger

Re: S-Tag over VOSS Fabric using VSP 7400 Switches

Ashlee_Smith — Wed, 05 May 2021 13:31:14 GMT

The ethertype of the SPBM is 0x8100 if that is what you are referring to.

Or do you mean the packet coming in from the Fibre provider side?

Re: S-Tag over VOSS Fabric using VSP 7400 Switches

Roger_Lapuh — Wed, 05 May 2021 14:02:10 GMT

QinQ packet coming from the provider, otherwise VSP does not know to look at the q-tag. VSP does not support QinQ natively at this point. This would require a feature request.

Roger

Re: S-Tag over VOSS Fabric using VSP 7400 Switches

Ashlee_Smith — Wed, 05 May 2021 15:04:22 GMT

Okay I see, this is a downer as the reason we went with these switches was to pass S-Tags but I understand what you are saying.

I do not know the ethertype the provider is handing over but I assume it is either 0x88a8 or 0x9100.

Let me confirm that, if they can accommodate a 0x8100 ethertype then am I correct to assume the fabric will have no issues passing the S-Tag?

Re: S-Tag over VOSS Fabric using VSP 7400 Switches

Roger_Lapuh — Wed, 05 May 2021 15:07:43 GMT

yes, then the S-tag will be used to classify the VLANs.

Re: S-Tag over VOSS Fabric using VSP 7400 Switches

Ashlee_Smith — Wed, 05 May 2021 15:56:44 GMT

Okay I see.

Let me throw a curve ball in 🙂

We have our own lab setup that uses the following:

0x8100 is kept across all devices involved. The edge routers are mikrotiks with service identifier turned on (S-Tag).

Edge router A 0x8100 - VLAN 3490

Edge router B 0x8100 - VLAN 3490

Extreme Switch 1

i-sid 3490

c-vid 3490 port 1/7 - Edge router A

Extreme Switch 2

i-sid 3490

c-vid 3490 port 1/32 - Edge router B

We are unable to pass S-Tag across the fabric with this setup.

MAC Table from SW1

************************************************************************************
Command Execution Time: Wed May 05 10:54:22 2021 SAST
************************************************************************************

========================================================================================================
I-SID Fdb Table
========================================================================================================
I-SID STATUS MAC-ADDRESS INTERFACE TYPE DEST-MAC BVLAN DEST-SYSNAME
--------------------------------------------------------------------------------------------------------
3490 learned 48:8f:5a:64:d1:eb Port-1/49 REMOTE 00:db:dc:01:00:02 4052 JHB-Core-Switch-2
3490 learned b8:69:f4:6a:1e:44 c3490:1/7 LOCAL 00:00:00:00:00:00 0

c: customer vid u: untagged-traffic

All 2 out of 2 Total Num of i-sid FDB Entries displayed

MAC Table from SW2

Command Execution Time: Wed May 05 10:53:34 2021 GMT
************************************************************************************

========================================================================================================
I-SID Fdb Table
========================================================================================================
I-SID STATUS MAC-ADDRESS INTERFACE TYPE DEST-MAC BVLAN DEST-SYSNAME
--------------------------------------------------------------------------------------------------------
3490 learned 48:8f:5a:64:d1:eb c3490:1/32 LOCAL 00:00:00:00:00:00 0
3490 learned b8:69:f4:6a:1e:44 Port-1/49 REMOTE 00:db:dc:01:00:01 4052 JHB-Core-Switch-1

c: customer vid u: untagged-traffic

All 2 out of 2 Total Num of i-sid FDB Entries displayed

As you can see we are learning MAC addresses across the fabric between the switches but not from the routers:

Edge Router A

Edge router B

Re: S-Tag over VOSS Fabric using VSP 7400 Switches

Roger_Lapuh — Thu, 06 May 2021 14:54:09 GMT

Obviously I can’t debug your case here. If you are following everything according to Ludovico’s document, it should work, otherwise I suggest to open a GTAC case. This is not the first time an S-TAG is transported over an SPB fabric.

Thanks Roger

Re: S-Tag over VOSS Fabric using VSP 7400 Switches

Ashlee_Smith — Tue, 11 May 2021 16:30:55 GMT

Obviously.

We have a GTAC case opened.

If you are following everything according to Ludovico’s document, it should work.

I followed this to the T same firmware and configuration, it did not work sadly.

Will see what GTAC comes back with, thanks for the replies.

Re: S-Tag over VOSS Fabric using VSP 7400 Switches

Roger_Lapuh — Wed, 19 May 2021 21:29:13 GMT

Ashlee, would you mind sending me the GTAC case number to rlapuh@extremenetworks.com so I can sync with the GTAC engineer. Thanks Roger

Re: S-Tag over VOSS Fabric using VSP 7400 Switches

Ludovico_Steven — Mon, 28 Jun 2021 15:39:42 GMT

I personally re-verified the QinQ setup using VSP7400s and it works correctly. From the packet captures sent to GTAC it would appear that the ethertype in use was not 8100 but 88a8.