3com S7906E 安装指导
1-27
To do…
Use the command…
Remarks
Enable MPLS LDP GR
graceful-restart
Required
Disabled by default
Disabled by default
Set the FT reconnect timer
graceful-restart timer
reconnect timer
reconnect timer
Optional
300 seconds by default
300 seconds by default
Set the LDP neighbor liveness
timer
timer
graceful-restart timer
neighbor-liveness
neighbor-liveness
timer
Optional
120 seconds by default
120 seconds by default
Set the LDP recovery timer
graceful-restart timer
recovery
recovery
timer
Optional
300 seconds by default
300 seconds by default
During MPLS LDP GR, a GR helper takes the lesser one between its LDP neighbor liveness time and
the GR restarter’s FT reconnect time as its FT reconnect interval, and takes the lesser one between its
LDP recovery time and that of the GR restarter as its LDP recovery interval.
the GR restarter’s FT reconnect time as its FT reconnect interval, and takes the lesser one between its
LDP recovery time and that of the GR restarter as its LDP recovery interval.
Restarting MPLS LDP Gracefully
To test MPLS LDP GR without main/backup switchover, you can restart MPLS LDP gracefully. You are
not recommended to perform this operation in normal cases.
not recommended to perform this operation in normal cases.
Follow these steps to restart MPLS LDP gracefully:
To do…
Use the command…
Remarks
Restart MPLS LDP gracefully
graceful-restart mpls ldp
Required
Available in user view
Available in user view
Configuring BFD for MPLS LDP
Bidirectional forwarding detection (BFD) provides a mechanism to quickly detect and monitor the
connectivity of links in networks. MPLS LDP can use it to detect neighbor failures. After a failure is
detected, the MPLS forwarding plane can switch the service from the active path to a standby path. You
need to configure MPLS-related functions before enabling BFD for MPLS LDP.
connectivity of links in networks. MPLS LDP can use it to detect neighbor failures. After a failure is
detected, the MPLS forwarding plane can switch the service from the active path to a standby path. You
need to configure MPLS-related functions before enabling BFD for MPLS LDP.
Follow these steps to configure BFD for MPLS LDP:
To do…
Use the command…
Remarks
Enter system view
system-view
—
Enter MPLS LDP remote
peer view
peer view
mpls ldp remote-peer
remote
remote
-peer-name
—
Enable BFD for MPLS LDP
remote-ip bfd
Required
Disabled by default
Disabled by default