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Cisco Bug: CSCtc20863 - RIB and LDP is out of sync and LDP LABEL is pointing to stale informatio

Last Modified

Jan 17, 2017

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

3.9.0.BASE 3.9.0.ROUT

Description (partial)


MPLS forwarding entries were created for prefixes which should have been 
filtered due to label allocation ACL.  These entries ended up stale since any 
further route updates were ignored due to filter.  Can result in traffic loss.

LDP process received routing update at the same as label alloc ACL config was 
applied.  Labels were allocated for prefixes which had just been processed at 
the same time that ACL was applied.  These labels should have been deleted 
but were not due a bug.  Any further subsequent routing updates for these 
prefixes were filtered and forwarding entries became stale.
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