Differentiating between 802.1q and 802.1ad frames

Does anyone know how to set up a qos policy that can classify based on whether an incoming frame is 802.1q (single tagged) or 802.1ad (double tagged) on an ME3400E?

Thanks a lot for your suggestion.
I have played around with this feature and unfortunately it looks like the ingress interface has to be configured as a dot1q tunnel in order for the match inner vlan option to work. We want the interface to be a plain 802.1q trunk interface. Also, to use this feature we would have to know the vlan numbers and match on each one. In our environment the interface will be a UNI to a customer so we will not know (or want to know) the inner vlans being used.

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Hi,
Ive been reading through documentation and posts in the forum about L2 tunneling EVC etc.. but some items are still confusing so if some people out there can shed some light would be great.
Im using 7600 with ES+ cards and ME3400E, Aim is to setup a L2 tunnel for a customer over an SP network (I run the SP network)
Q1. Am I correct in saying that QinQ is proprietary version of the technology while 802.1ad is the standardised version but they essentially achieve the same thing (abit like ISL and dot1q vlans) and you would use either one or the other ?
For QinQ config like this on the customer facing port should do it
int g0/1
switchport mode dot1q tunnel <-- (setup the l2 tunnel for C tagged frames and apply S vlan)
switchport access vlan 5 <-- the S vlan to apply as the second outer tag
l2 protocol tunnel <-- tunnel not process L2 control frames like STP, CDP
For 802.1ad we achieve the same by saying:
int g0/1
ethernet dot1ad uni s-port <-- (setup the l2 tunnel for C tagged frames and apply S vlan)
switchport access vlan 5 <-- the S vlan to apply as the second outer tag
l2 protocol forward <-- tunnel not process L2 control frames like STP, CDP
Q2. 8021.ad uses a different ethertype 0x88a8 instead of the standard 0x8100 for QinQ which is also used by v802.1q tagged frames - what are the advantages of using a different ethertype, and also what are the advantages of using dot1.ad compared to QinQ ethertype aside ? Im aware that 0x8100 frames arriving on a 0x88a8 port are considered untagged. Im just not seeing the reason to deploy with 0x88a8. Would apreciate any feedback from people using this in their daily operations and some pointers to any useful docs.
Q3. The above config are lets say a more traditional config approach. I see that it is possible to also do this with EVC and service instances.
Would something like the below achieve the same as what I mention in Q1 above ?
int g0/1
service instance 1
encapsulation dot1q
bridge domain 5
Is this functionally equivalent to QinQ since we match all tagged frames, we do not pop the vlan tag, but place in bridge domain 5 for forwarding where vlan 5 can be considered as the S vlan ?
Likewise the 802.1ad equivalent would be:
int g0/1
ethernet dot1ad uni s-port
service instance 1
encapsulation dot1q
bridge domain 5
thanks
Mark

I'm far from an expert in Metro Ethernet, but I was facing similar questions
as you (see also https://supportforums.cisco.com/thread/2200327), so let me give a try :
> Q1. Am I correct in saying that QinQ is proprietary version of the
> technology while 802.1ad is the standardised version but they
> essentially achieve the same thing (abit like ISL and dot1q vlans) and
> you would use either one or the other ?
I would agree with that.
> Q2. 8021.ad uses a different ethertype 0x88a8 instead of the standard
> 0x8100 for QinQ which is also used by v802.1q tagged frames - what are
> the advantages of using a different ethertype, and also what are the
> advantages of using dot1.ad compared to QinQ ethertype aside ? Im
> aware that 0x8100 frames arriving on a 0x88a8 port are considered
> untagged. Im just not seeing the reason to deploy with 0x88a8. Would
> apreciate any feedback from people using this in their daily
> operations and some pointers to any useful docs.
The advantage of 0x88a8 is compatibility with non-Cisco equipment,
especially if that equipment doesn't have a 'Cisco compatibility'
feature to use 0x8100 for the S-tag. The Metro Ethernet forum
(MEF) always consistently mentions 0x88a8 for the outer
encapsulation (S-tag).
You can also check out a Cisco document, namely
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/design/guide/CE2.0_certification_v1.pdf
From what I see there, the 7600 and ASR9000 can interface to unknown Metro Ethernet
via dot1ad. I believe that the ME3800X cannot, have seen no options for "dot1ad"
or "0x88a8" (I mean that probably they can only use 0x8100 for outer tag and you
can't interface them to non-Cisco equipment).
> Q3. The above config are lets say a more traditional config approach.
> I see that it is possible to also do this with EVC and service
> instances.
Agreed.
I will follow this post, please add to this post if you learn something new.
Patrick

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Hi,
How does the switch differentiation based on the 3-bit priority field in the 802.1P or 802.1Q frame?
Regards
M

Hi,
Basically 802.1q specifies the VLAN tag and 802.1p describes the specific 3 bit priority field
inside that 4 octet tag.
Some useful info:
http://www.javvin.com/protocolVLAN.html
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Regards.

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Hi,
In an LWAPP environment, who does the 802.3 to 802.11 frame translation ?
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Can wireless clients roam seamlessly between 802.11a and 802.11g APs? they will be using the same SSID.
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I have moved to another vendor at my edge, and I have continued to use 0x8100 as my ethertype which seems to play nice except for when a customer has a native vlan1 setup.
Vlan1 will get tagged into my SVLAN 301, but Cisco sees it as an incorrect BPDU, and shuts down the port. I also see customer CDP neighbor information, and other stuff when the customer doesnt prune his network down, or uses vlan1 on transparent lan services.
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VLAN0301
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Root ID Priority 4397
Address 0017.5aaf.f200
This bridge is the root
Hello Time 2 sec Max Age 10 sec Forward Delay 7 sec
Bridge ID Priority 4397 (priority 4096 sys-id-ext 301)
Address 0017.5aaf.f200
Hello Time 2 sec Max Age 10 sec Forward Delay 7 sec
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Currently, the default ether type is 0x8100 on a Cisco 7600 for the Q-in-Q outer tag. However, a few non-Cisco vendors use 0x9100 or 0x9200 ether type for the Q-in-Q outer tag. For Cisco 7600 router to operate seamlessly with other vendors it is required to provide a mechanism to change the default ethertype.
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Benefits
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%SPANTREE-2-RECV_BAD_TLV: Received SSTP BPDU with bad TLV on [chars]
[chars].
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Hi all,
I trying settings the follow environment.
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switchport mode dot1q-tunnel
I reserarching the 802.1ad and qinq the follow ethertype 88a8 and 9100 the diference is qinq is usage only for tunnel? correct?
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The scenario for the client is:-
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With Best Regards,
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In their Legacy system;-
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An employee 1654 is in "In-Agreement" employee and also part of category 16 "Deliante".
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With Best Regards,
Sunny Singh

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Differentiating between 802.1q and 802.1ad frames

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