Alcatel-Lucent 7705 - Figure 37: Pseudowire Redundancy with Four Spoke Sdps

VLL Service Considerations
Page 194 7705 SAR OS Services Guide
Secondary Spoke SDPs Only
If a primary spoke SDP is not defined, up to four secondary spoke SDPs can be defined. The
user can configure the precedence of each secondary PW to indicate the order in which
secondary PWs are activated. The secondary PW with the highest precedence is selected
first. If two or more secondary spoke SDPs are assigned the same precedence, the
7705 SAR OS selects the secondary path that is operationally up and has the lowest spoke
SDP identifier. There is no revertive behavior between secondary paths, which means that a
secondary path will not switch to another secondary path of higher precedence if one
becomes available.
The use of four secondary spoke SDPs is illustrated in Figure 37, where:
• spoke SDP-1 goes over S-PE-1 to T-PE1 (red path) (S-PE is a switching PE and
T-PE is a terminating PE)
• spoke SDP-2 goes over S-PE-1 to T-PE2 (green path)
• spoke SDP-3 goes over S-PE-2 to T-PE1 (violet path)
• spoke SDP-4 goes over S-PE-2 to T-PE2 (orange path)
.
Figure 37: Pseudowire Redundancy with Four Spoke SDPs
20227
Access
Redundancy
MC-LAG
7705 T-PE 3
RNC
7450
7450
7750 S-PE 1
7750 S-PE 2
7750 S-PE 3
7750 S-PE 4
7750 T-PE 1
7750 T-PE 2
7450
Spoke SDP-2
Spoke-SDP-1
Spoke-SDP-3
Spoke-SDP-4
Legend:
METRO ETHERNET NW MTSOCORE NW
(LSR)