Selecting The Active Spoke Sdp For Pw Redundancy Configuration - Alcatel-Lucent 7705 Service Manual

Multiple spoke SDPs can be established between a 7705 SAR and any SR platform. For
example, multiple spoke SDPs on a 7705 SAR can connect to a 7750 SR. In this case, the
7750 SR must be configured to use multi-chassis backup in conjunction with multi-segment
PWs; that is, the 7750 SR nodes at the far end must support multi-chassis redundancy.
A PW service endpoint can only use a single active spoke SDP for transmission at any given
time. A PW SAP can receive traffic from any of the endpoint spoke SDPs assigned to the
service.
7705 SAR nodes support user-initiated manual switchover of the VLL path to the primary
path or any of the secondary paths using the
tools>perform>service-id
outages such as node upgrade procedures.

Selecting the Active Spoke SDP for PW Redundancy Configuration

There are two main scenarios for configuring PW redundancy. One scenario uses a primary
spoke SDP and provides revertive behavior. The other scenario uses only secondary spoke
SDPs for non-revertive behavior.
Note: Non-revertive behavior is not supported on Cpipes.
Primary and Secondary Spoke SDPs
If a primary spoke SDP is defined, up to three secondary spoke SDPs can also be defined.
The VLL service always uses the primary endpoint PW and only switches to a secondary
PW when the primary PW is down. The PW service switches the path back to the primary
PW when the primary PW is back up. The user can configure a timer to delay reverting back
to the primary path or to never revert back. When the primary PW goes down, the
7705 SAR OS selects the secondary spoke SDP that is operationally up and has the highest
precedence setting.
7705 SAR OS Services Guide
force-switchover
context. A manual switchover is useful during planned
VLL Services
command under the
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