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MPLS VPN Is Broken because of Advertising of Aggregated Network Segment

Publication Date:  2012-07-27 Views:  48 Downloads:  0
Issue Description
Topology:
NE80A-------GE------NE80B
      |                                   |
      |                                   |
155Mpos                 155M pos
      |                                   |
 (PE)NE40--FE-----M20(PE) (Junniper)
      |     
  (CE)
NE80A, NE80B,  NE40,  and M20 run ISIS (NE40 and M20 run OSPF, and together with downlayer equipment form MAN) . The link between NE40 and NE80A fails, and MPLS VPN under NE40 fails also.  
Alarm Information
Null
Handling Process
Enable ISIS between NE40 and M20 to ensure detailed route for Loopback ip address of NE40 exit  in network. 
Root Cause
Loopback IP Address locates in the network segment is converged; once the link fails, there is no detailed route of Loopback of NE40, so LSP cannot set up. 
Suggestions
Null

END