Page 228 7750 SR OS Services Guide
pseudowires is the same, T-PE1 will normally not switch the VLL path onto the secondary
pseudowire upon receipt of a pseudowire status notification indicating the remote SAP is down
since the status notification is sent over both the primary and secondary pseudowires. However,
the status notification on the primary pseudowire may arrive earlier than the one on the secondary
pseudowire due to the differential delay between the paths. This will cause T-PE1 to switch the
path of the VLL to the secondary standby pseudowire and remain there until the status notification
is cleared. At that point in time, the VLL path is switched back to the primary pseudowire due to
the revertive behavior operation. The path will not switch back to a secondary path when it
becomes up even if it has a higher precedence than the currently active secondary path.
This application can make use of all types of VLL supported on the routers, for example, Apipe,
Fpipe, Epipe, and Ipipe services. A SAP can be configured on SONET/SDH port which is part of
an APS group. However, if a SAP is configured on a MC-LAG instance, only the Epipe service
type will be allowed.
To Next Page
Loading...
