Switching Static MPLS-TP to Dynamic T-LDP Signaled PWs
Page 80 7450 ESS MPLS Guide
Switching Static MPLS-TP to Dynamic T-LDP Signaled PWs
Some use cases for MPLS-TP require an MPLS-TP based aggregation network and an IP-based
core network to interoperate, so providing the seamless transport of packet services across static
MPLS-TP and dynamically signaled domains using an MS-PW. In this environment, end to end
VCCV Ping and VCCV Trace may be used on the MS-PW. This is illustrated in the following
figure:
Figure 23: Static - Dynamic PW Switching with MPLS-TP
Services are backhauled from the static MPLS-TP network on the left to the dynamic IP/MPLS
network on the right. The 7750 acts as an S-PE interconnecting the static and dynamic domains.
The 7x50 implementation supports such use cases through the ability to mate a static MPLS-TP
spoke-sdp, with a defined pw-path-id, to a FEC128 spoke-sdp. The dynamically signaled spoke-
sdp must be MPLS; GRE PWs are not supported, but the T-LDP signaled PW can use any
supported MPLS tunnel type (e.g. LDP, RSVP-TE, static, BGP). The control-word must be
enabled on both mate spoke-sdps.
Mapping of control channel status signaling to and from T-LDP status signaling at the 7x50 S-PE
is also supported.
The use of VCCV Ping and VCCV Trace on an MS-PW composed of a mix of static MPLS-TP
and dynamic FEC128 segments is described in more detail in the 7x50 SR OS OAM and
Diagnostics Guide.
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