HP HPE FlexNetwork MSR Router Series, Configuration Manual, Page: 417 / 594

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NOTE:
When VLANs are globally unique, packets with the same VLAN ID are forwarded over the PW
bound with that VLAN ID regardless of the receiving interfaces. If VLANs are unique on a per
interface basis, packets with the same VLAN ID from different interfaces can be forwarded over
different PWs.
4. Bind the AC to the PW:
Bind the Layer 3 physical interface, Layer 3 subinterface, or VLAN interface to the PW, so the
PE forwards packets between the AC and the PW.
Local connection establishment
To set up a local MPLS L2VPN connection between two CEs:
1. Set up ACs:
Configure the link layer protocol to set up an AC between the PE and each CE. For more
information, see "
Set up an AC between a PE and a CE: ."
2. Bind the two ACs:
Bind the PE's interfaces connected to the two CEs so the PE can forward packets between
CEs.
PW types
MPLS L2VPN transports Layer 2 data of different data link layer protocols through PWs. A PE
encapsulates a Layer 2 packet received from an AC according to the PW type. The PW type is
determined by the link type of the AC, as shown in
Table 38 .
Table 38 Relationship between AC types and PW types
AC type PW type
Ethernet
Ethernet
VLAN
PPP PPP
HDLC HDLC
Ethernet over MPLS
Ethernet over MPLS uses MPLS L2VPN to connect Ethernets, and delivers Ethernet packets
through a PW over the MPLS backbone.
The following PW types are available for Ethernet over MPLS:
•
Ethernet —P-tag is not transferred on a PW.
{
For a packet from a CE:
−
If the packet contains a P-tag, the PE removes the P-tag, and adds a PW label and an
outer tag into the packet before forwarding it.
−
If the packet contains no P-tag, the PE directly adds a PW label and an outer tag into the
packet before forwarding it.
{
For a packet to a CE:
−
If the access mode is configured as VLAN by using the ac interface command, the PE
adds a P-tag into the packet before sending it to the CE.
−
If the access mode is configured as Ethernet by using the ac interface command, the
PE directly sends the packet to the CE.