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reconnect timeout: Specifies the Reconnect time in the range of 60 to 300 seconds. This time
specifies the period the local LSR expects the peer to wait for LDP session re-establishment after
the peer detects an LDP session failure. The local LSR sends the Reconnect time to the peer.
Usage guidelines
The MPLS Forwarding State Holding time must be greater than the Reconnect time.
In a GR process, the timers work as follows:
When LDP restarts, the GR restarter starts the MPLS Forwarding State Holding timer, and
1.
marks the MPLS forwarding entries as stale. When a GR helper detects that the LDP session
with the GR restarter is down, it marks the FEC-label mappings learned from the session as
stale and starts the Reconnect timer, the value of which is received from the GR restarter.
After the LDP restart, the GR restarter re-establishes an LDP session with the GR helper. If the
2.
LDP session is not set up before the Reconnect timer expires, the GR helper deletes stale
FEC-label mappings and corresponding MPLS forwarding entries. If the LDP session is
successfully set up before the Reconnect timer expires, the GR restarter sends the remaining
time of the MPLS Forwarding State Holding timer as the LDP Recovery time to the GR helper.
After the LDP session is re-established, the GR helper starts the LDP Recovery timer.
3.
The GR restarter and the GR helper exchange label mappings and update their MPLS
4.
forwarding tables.
The GR restarter compares each received label mapping against stale MPLS forwarding entries.
If a match is found, the restarter deletes the stale mark for the matching entry. Otherwise, it
adds a new entry for the label mapping.
The GR helper compares each received label mapping against stale FEC-label mappings. If a
match is found, the helper deletes the stale mark for the matching mapping. Otherwise, it
adds the received FEC-label mapping and a new MPLS forwarding entry for the mapping.
When the MPLS Forwarding State Holding timer expires, the GR restarter deletes all stale
5.
MPLS forwarding entries.
When the LDP Recovery timer expires, the GR helper deletes all stale FEC-label mappings.
6.
Examples
# Set the MPLS Forwarding State Holding time to 200 seconds, and the Reconnect time to 100
seconds.
<Sysname> system-view
[Sysname] mpls ldp
[Sysname-ldp] graceful-restart timer forwarding-hold 200
[Sysname-ldp] graceful-restart timer reconnect 100
Related commands
display mpls ldp parameter
•
graceful-restart
•
label-distribution
Use label-distribution to configure the label distribution control mode.
Use undo label-distribution to restore the default.
Syntax
label-distribution { independent | ordered }
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