Technical Documentation

Fast Reroute Detour Down Event

LSP Event

Fast reroute detour down

Sample Output

user@R1> show mpls lsp extensive
[...Output truncated...]
  From:, State: Up, ActiveRoute: 0, LSPname: R1-R6-3
  ActivePath:  (primary)
  FastReroute desired
  LoadBalance: Random
  Encoding type: Packet, Switching type: Packet, GPID: IPv4
 *Primary                    State: Up
    Computed ERO (S [L] denotes strict [loose] hops): (CSPF metric: 20) S S 
    Received RRO (ProtectionFlag 1=Available 2=InUse 4=B/W 8=Node 10=SoftPreempt):

    9 Feb 15 20:52:56 Fast-reroute Detour Up
    8 Feb 15 20:52:53  Fast-reroute Detour Down
    7 Feb 15 20:50:00 Record Route:
    6 Feb 15 20:50:00 Fast-reroute Detour Up
    5 Feb 15 20:49:57 Selected as active path
    4 Feb 15 20:49:57 Record Route:
    3 Feb 15 20:49:57 Up
    2 Feb 15 20:49:56 Originate Call
    1 Feb 15 20:49:56 CSPF: computation result accepted
  Created: Tue Feb 15 20:49:56 2005
Total 3 displayed, Up 3, Down 0
[...Output truncated...]


This LSP event applies only to detours on the router and indicates that the one-to-one (1:1) fast reroute detour to bypass the next downstream node is down.


This LSP event is caused by a failure or configuration change that deletes or resignals the fast reroute detour path. For example, a detour path interface or primary link may be deactivated.


Analyze the status to determine if this is the required behavior. If this is not the required behavior, verify the surrounding LSP events to identify the cause of the problem.

Published: 2010-01-30