Alcatel-Lucent 7750 SR OS Service Manual page 1374

OAM Overview
Pseudowire switching is a method to scale a large network of VLL or VPLS services by removing
the need for a full mesh of T-LDP sessions between the 7x50 PE nodes as the number of these
nodes grows over time. In the network displayed in
pseudowire originates and terminates. The switching PE (S-PE) is the node that performs
switching by cross-connecting two spoke SDPs.
VCCV ping supports the following OAM functions:
•
•
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VCCV ping to a destination PE. A VLL FEC ping is a message sent by T-PE1 to test the
FEC at T-PE2. The operation at T-PE1 and T-PE2 is the same as in the case of a single-
segment pseudowire in
An alternative method, based on T-PE1 including a new multi-segment pseudowire
control word which gets processed by S-PE1, is described in draft-hart-pwe3-segmented-
pw-vccv-00.txt, VCCV Extensions for Segmented Pseudo-Wire.
Use of the OAM control word
0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 1| FmtID | Reserved
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 3: OAM Control Word Format
Figure
Figure 72.
(Figure 73).
2
| Channel Type
7750 SR OS Services Guide
72, a terminator PE (T-PE) is where the
3
|