HP HSR6800 Configuration Manual page 159

The VC is successfully set up after both PE 1 and PE 2 calculate the VC labels.
Table 2 compares the implementation modes of MPLS L2VPN.
Table 2 Comparing MPLS L2VPN implementation modes
VC label
Mode encapsulation and
distribution
VC label
encapsulation: one
level of label
CCC
VC label distribution:
static configuration
VC label
encapsulation: two
levels of labels
SVC
VC label distribution:
static configuration
VC label
encapsulation: two
levels of labels
Martini
VC label distribution:
LDP
VC label
encapsulation: two
levels of labels
Kompella
VC label distribution:
BGP
Advantages and disadvantages
Advantages:
•
Requires no signaling protocol and occupies
fewer network resources.
•
Network devices only need to support
MPLS.
•
Better QoS for traffic as LSPs are exclusive
to CCC connections.
•
Supports local and remote connections.
Disadvantages:
•
Configuration and maintenance are
complicated. You must configure two static
LSPs in opposite directions for each CCC
connection on each P device.
•
Cannot automatically adapt to network
changes.
Advantage: Requires no signaling protocol and
occupies fewer network resources.
Disadvantage:
•
Cannot automatically adapt to network
changes.
•
Supports only remote connections.
Advantages:
•
On a carrier network, only PEs need to save
a few VC label to LSP mappings. The P
devices do not need to save any Layer 2
VPN information.
•
To add a new VC, you only need to configure
the PEs of the VC, without interrupting
network operation.
Disadvantage: Supports only remote
connections.
Advantages:
•
Introduces the concept of VPN to prevent
CEs in different VPNs from communicating
with each other.
•
Uses label blocks to assign additional labels
to user VPNs for future use, greatly reducing
the VPN deployment and configuration
workload in the case of expansion.
•
To add a CE to the network, you only need to
configure the PE to which the CE is
connected. The configuration workload is
small and does not interrupt network
operation.
•
Supports local and remote connections.
Disadvantage: The implementation is relatively
complicated.
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Application
scenario
Small-scale
network with a
simple
topology
where all
network
devices
support
MPLS.
Small-scale
network with a
simple
topology.
Sparse Layer
2 connections,
such as a star
topology.
Full-mesh
network.