EX4600 on ELS: l3-interface over a QinQ / C-VLAN

Hello,

After reading various posts in the forum and using Juniper's documentation, we managed to have a working QinQ configuration for our EXs: We can switch packets from a dot1Q trunk to a QinQ.

Example configuration:

# on ge-0/0/10, we send and receive simple tagged packets for VLANs 152-154
set interfaces ge-0/0/10 flexible-vlan-tagging
set interfaces ge-0/0/10 encapsulation extended-vlan-bridge
set interfaces ge-0/0/10 unit 129 vlan-id-list 152-154
set interfaces ge-0/0/10 unit 129 input-vlan-map push
set interfaces ge-0/0/10 unit 129 output-vlan-map pop

# on ge-0/0/22, we send and receive double tagged packets with S-VLAN = 129
set interfaces ge-0/0/22 flexible-vlan-tagging
set interfaces ge-0/0/22 encapsulation extended-vlan-bridge
set interfaces ge-0/0/22 unit 129 vlan-id 129

# Bridging them together
set vlans ID129 interface ge-0/0/10.129
set vlans ID129 interface ge-0/0/22.129

Now, we'd like to put an IP interface on a C-VLAN.

On a cisco 3750, we have a loop to care for the QinQ tunneling and then we can have standard GigabitEthernetxx/xx.C-VLAN interfaces. We haven't been able to replicate the behaviour on our EX.

We tried two different approaches:

• Use the inner/outer-vlan-tag directives => While they are accepted on the EX, we never managed to get them to work. Some forums suggest that it is MX-only?
• Looping a cable, do the de-encapsulation on an interface and put the l3-interface on the trunk => ARP response OK, but no IP traffic got through. Maybe a MAC table issue? We tried disabling MAC learning, it did not help.

Does anyone have experience regarding such configurations? Is it known no to be doable?

Regards,