Hello,
I'm doing some interoperability tests between Cisco and Juniper routers
and I wanted to ask about a particular piece of config.
I would expect that it shouldn't work, but it works perfectly, so I'm a
bit confused.
There is a l2vpn circuit between ASR9k and MX80 running in VLAN mode (VC
Type 4).
------------------- ASR9k ------------------------------------
interface TenGigE0/0/1/5.3101 l2transport
encapsulation dot1q 3101
rewrite ingress tag pop 1 symmetric
l2vpn
!
pw-class PW_TYPE_VLAN
encapsulation mpls
transport-mode vlan
!
!
!
xconnect group XCONNECT_GROUP_2
p2p PW2
interface TenGigE0/0/1/5.3101
neighbor ipv4 3.3.3.3 pw-id 101
pw-class PW_TYPE_VLAN
!
!
!
------------------- MX80 -------------------------------------
ge-1/0/1 {
description "ESXi 2 VMNIC3";
flexible-vlan-tagging;
encapsulation flexible-ethernet-services;
unit 3101 {
encapsulation vlan-ccc;
vlan-id 3101;
protocols {
l2circuit {
neighbor 4.4.4.4 {
interface ge-1/0/1.3101 {
virtual-circuit-id 101;
no-control-word;
encapsulation-type ethernet-vlan;
}
}
}
}
In my understanding following things should happen:
- a frame coming to ASR9k from a CE is tagged with VLAN 3101
- we are doing VLAN tag manipulation on ASR9k, the tag is popped
- since we are using VC type 4, the PW forwarder adds a dummy tag 0
before forwarding the frame
- MX80 should get the frame with tag 0 imposed
If above is true, how does the MX handle the dummy tag?
Thanks,
Marcin
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