Ehlo,
Docs are correct , although semantics may be misleding sometimes...
In that particular example docs are refering CCC circuit-cross connect (
which is the oldest
method for JNPR to do l2 over mpls ) but its proprietary and uses one RSVP
LSP per l2 circuit
(or rather two LSPs for bidirectional communication).
You can configure that kind of interconnection under [edit protocols
connections] stanza. There is no notion of
hierarchy in circuit-cross connect like you can find in L2VPN and PW docs.
Other JNPR L2 over MPLS are l2circuit ( pseudo wire emulation ) , L2VPNs and
VPLS ( eth specific ). Apart from signalization
protocol L2VPN and l2circuits have other differences ( like on2one vs
one-to-many etc ) but as you pointed it out correctly , they both exchange
circuit "demultiplexor" labels and thus are able to use same PSN tunnel for
different circuits.
rgrds
Piotr Marecki
Can someone explain what is the difference between L2 Circuits and L2 VPNs
besides the obvious (which is signaling LDP vs BGP).
Junos 9.1 doc states this in the VPN conf guide, page 509.
"A Layer 2 circuit is similar to a circuit cross-connect (CCC), except
that multiple Layer 2 circuits can be transported over a single
label-switched path
(LSP) tunnel between two provider edge (PE) routers. In contrast, each CCC
requires
a dedicated LSP."
What does it mean the each CCC requires a dedicated LSP? If I build a
transport tunnel using LDP, then all L2 VPN instances between two PEs will
use the same tunnel, no matter whether ai use CCC or not.
Thanks,
Marlon
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