MPLS and RSVP
7450 ESS MPLS Guide Page 69
Figure 16: Label for LSP and PW G-ACh Packets
The system supports the G-ACh on static pseudowires and static LSPs.
MPLS-TP Operations, Administration and Maintenance (OAM)
This section details the MPLS-TP OAM mechanisms that are supported.
On-Demand Connectivity Verification (CV) using LSP-Ping
MPLS–TP supports mechanisms for on demand CC/CV as well as route tracing for LSPs and
PWs. These are required to enable an operator to test the initial configuration of a transport path,
or to assist with fault isolation and diagnosis. On demand CC/CV and route tracing for MPLS-TP
is based on LSP-Ping and is described in RFC6426. Three possible encapsulations are specified in
that RFC:
• IP encapsulation, using the same label stack as RFC4379, or encapsulated in the IPv4 G-
ACh channel with a GAL/ACH
• and non-IP encapsulation with GAL/ACH for LSPs and ACH for PWs.
In IP-encapsulation, LSP-Ping packets are sent over the MPLS LSP for which OAM is being
performed and contain an IP/UDP packet within them. The On-demand CV echo response
message is sent on the reverse path of the LSP, and the reply contains IP/UDP headers followed by
the On-demand CV payload.
al_0230
LSP Label LSP Label
LSP OAM Packet
Label Stack
PW OAM Packet
Label Stack
GAL PW Label
ACH ACH
Payload Payload
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