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Cisco Bug: CSCut58364 - Backwalk to BGP leaf is not correct during few triggers

Last Modified

May 13, 2018

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

5.3.0.BASE 5.3.2.BASE

Description (partial)

Traffic loss and wrong cef fast_pbts and fast_nrldi pointer values during bgp back walk

sh cef hardware ingress detail location 0/5/CPU0 | i "leaf_ptr|fastnrldi"
                    leaf_ptr: 0x53e4(LE)            bgp_next_hop: 0x629755d1 >>>>>>>> this should have 0x4166 instead of 0x53e4
	             pbts_ldi_tbl_idx: 0x0, fastnrldi:0x4166

This can happen in any of the below conditions:
1. tunnel remove/add, LC reload
2. ECMP path change for the IGP prefix. Example from 4 to 2, or from 2 to 4. Note this can happen when a BGP prefix is dependent on IGP prefix that is on pure MPLS TE path end to end.
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