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Table 1
compares the implementaion modes of MPLS L2VPN.
Table 1 Comparing MPLS L2VPN implementation modes
VC label encapsulation
Mode
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
Advantanges:
Requires no signaling protocol and occupies
fewer network resources.
Network devices only need to support MPLS.
Better QoS for service traffic as LSPs are
exclusive to CCC 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 few 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.
Disadvantage: The implemetation is relatively
complicated.
197
Application
secnario
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.

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