Remote Connection Establishment - HP MSR2000 Configuration Manual
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Figure 90 Local connection model
Remote connection establishment
To set up a remote MPLS L2VPN connection:
1.
Set up a public tunnel to carry one or more PWs between PEs:
The public tunnel can be an LSP, MPLS TE, or GRE tunnel.
If multiple public tunnels exist between two PEs, you can configure a tunnel policy to control tunnel
selection. For more information about tunnel policies, see "Configuring tunnel policies."
If a PW is established over an LSP or MPLS TE tunnel, packets on the PW have two labels. The outer
label is the public LSP or MPLS TE tunnel label that MPLS uses to forward the packet to the peer PE.
The inner label is the PW label that the peer PE uses to forward the packet to the destination CE.
2.
Set up a PW to connect customer networks:
PWs include static PWs, LDP PWs, BGP PWs, and Circuit Cross Connect (CCC) PWs.
To establish a static PW, configure the peer PE address, and the incoming and outgoing PW labels
for the PW on the two PEs. Static PWs consume a small amount of resources but have complex
configurations.
To establish an LDP PW, configure LDP and specify the peer PE address on the two PEs. LDP defines
a new FEC type named PW ID FEC for PEs to exchange PW-label bindings. The new FEC type uses
a PW ID and a PW type to identify a PW. The PW ID is the ID of the PW between PEs. The PW type
specifies the encapsulation type for data transmitted over the PW, such as ATM, FR, 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 CCC 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.
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