Passing traffic between qinq and dot1q in vpls

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jgmcd01
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Posts: 2
Joined: 15 Oct 2025 14:52

Passing traffic between qinq and dot1q in vpls

Post by jgmcd01 »

A definite noob here. I have a 7250 that we are installing as an aggregation router that needs to handle passing double tagged and single tagged traffic between 3 lags.

lag-1: qinq headed out to 7360 OLTs
lag-20: dot1q lag handing PON traffic and MGMT vlans to core router [2100-2999]
lag-30: dot1q lag handing vlans to operational business partner. [2-4094]

I have a test setup with servers at either end of the lags and not able to pass traffic between with one built as dot1q and the other using qinq.

example service vpls 300
admin-state enable
customer "1"
sap 1/5/c18/1:300.2 {
admin-state enable
}
sap 1/5/c20/1:2 {
admin-state enable
}
I have played with various ingress and egress on both of the saps, but unable to get the pings to traverse the vpls. Running 23.10.R6 as well

Thoughts? pointers?
paramount
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Posts: 86
Joined: 11 Jan 2015 17:18
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Re: Passing traffic between qinq and dot1q in vpls

Post by paramount »

Hi,

The config looks fine - I guess depends on what you have coming in on your SAPs.
You mention LAGs - but the below are direct on ports.

In your vpls, only packets tagged with 300.2 will be picked up on first port. This is how packets will be sent out too.
Only packets tagged with 2 will be picked up on second port. Again, that's how packets are sent out.

you can check if any MACs are learnt, to prove that correct VLANs are matching:

show service id 300 fdb detail

Also double check all SAPs are oper up - as sometimes MTU etc can keep them down:

show service id 300 base

Many thanks
Paramount
jgmcd01
Member
Posts: 2
Joined: 15 Oct 2025 14:52

Re: Passing traffic between qinq and dot1q in vpls

Post by jgmcd01 »

I just used the single ports as a test instead of building out the lags etc. Thanks for the quick reply. What is the guidance to be able to allow traffic to flow between those 2 saps? Essentially push 300 onto any single tagged packet so it can traverse the 300.2 sap? and vice versa to pop the outer so it can traverse the 2 sap? I see options for ingress and egress in the sap portion of the vpls, but there is no pop command etc.

Appreciate the input
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