MPLS in Mobile Backhaul Networks Framework and Requirements ...
MPLS in Mobile Backhaul Networks Framework and Requirements ...
MPLS in Mobile Backhaul Networks Framework and Requirements ...
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<strong>MPLS</strong> <strong>in</strong> <strong>Mobile</strong> <strong>Backhaul</strong> <strong>Networks</strong> <strong>Framework</strong> <strong>and</strong> <strong>Requirements</strong> Technical Specification IP/<strong>MPLS</strong> Forum 20.0.0<br />
___________________________________________________________________________________<br />
TNL TNL<br />
TNL PW<br />
TNL PW<br />
TNL<br />
TNL<br />
TNL PW<br />
TNL PW<br />
TNL PW<br />
LSP<br />
LSP<br />
LSP LSP<br />
LSP<br />
LSP<br />
LSP<br />
LSP<br />
L1 L1<br />
L1<br />
L1<br />
BS<br />
TDM<br />
ATM<br />
Ethernet<br />
T-PE<br />
CSG<br />
L2<br />
L1<br />
Access<br />
network<br />
L2<br />
L1<br />
L2<br />
L1<br />
<strong>MPLS</strong> network<br />
S-PE<br />
Access<br />
Node<br />
L2 L2<br />
L1<br />
P<br />
<strong>MPLS</strong><br />
Node<br />
L1<br />
Aggregation<br />
network<br />
T-PE<br />
MASG<br />
TDM<br />
ATM<br />
Ethernet<br />
Figure 9: Protocol stacks used for TNL transport <strong>in</strong> <strong>MPLS</strong> use case (f)<br />
In Figure 9, <strong>MPLS</strong> extends across the aggregation <strong>and</strong> access networks. The Access Node is <strong>MPLS</strong>aware,<br />
act<strong>in</strong>g as an S-PE device. The MS-PW segments are switched at the S-PE device.<br />
Note: <strong>in</strong> the case of scenarios (e) <strong>and</strong> (f) (figures 8 <strong>and</strong> 9 respectively), an implicit null LSP label may<br />
optionally be used for the MS-PW segment between directly-connected equipment across the access<br />
network, i.e. for the segment between the CSG <strong>and</strong> IP/<strong>MPLS</strong> Router (Edge Node) <strong>in</strong> scenario e, or for the<br />
segment between the CSG <strong>and</strong> Access Node <strong>in</strong> scenario f.<br />
TNL PW<br />
October 2008 Page 24<br />
L2<br />
L1<br />
RC
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