Pw Types - HP FlexNetwork 10500 Series Configuration Manual

PEs. The PW type specifies the encapsulation type for data transmitted over the PW, such as
Ethernet or VLAN. PEs advertise the PW label and PW ID FEC in label mapping messages to
create a PW. Dynamic PWs have simple configurations but consume more resources than
static PWs.
To establish BGP PWs, BGP advertises label block information in an extended BGP update to
PEs in the same VPN. Each PE uses the received label block information to calculate outgoing
labels and uses its own label block to calculate incoming labels. After two PEs complete label
calculation, a BGP PW is established between them. BGP PWs have the following features:
Simplified configuration—There is no need to manually specify peer PEs. A PE

automatically find peer PEs after receiving label block information from the peer PEs.
Reduced workload—Label block advertisement enables assigning labels for multiple PWs

at one time.
To establish a CCC PW, manually specify the incoming and outgoing labels for the PW on the
PEs, and create two static LSPs in opposite directions on P devices between PEs. There is no
need to configure a public tunnel for the CCC PW. CCC employs only one level of label to
transfer packets. The static LSPs on the P devices transfer data only for the CCC PW. They
cannot be used by other connections or MPLS L3VPN.
3. Set up an AC between a PE and a CE:
Set up an AC by configuring a link layer connection between a PE and a CE.
The AC can only be an Ethernet service instance on a Layer 2 Ethernet interface or Layer
2 aggregate interface. It forwards packets that are received on the interface and meet the
match criteria of the Ethernet service instance to the bound PW. If the match criterion is VLAN
ID, the VLAN is unique on a per interface basis rather than on a global basis.
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 Ethernet service instance to the
PW, so the PE forwards packets between the AC and the PW.

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 30 Relationship between AC types and PW types
AC type
Ethernet
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:

Table 30.
PW type
Ethernet
VLAN
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