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Cisco Bug: CSCvu40050 - KIC database v4 default route addition fails due to "prefix is already present"

Last Modified

Oct 03, 2020

Products (22)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 93108TC-FX Switch
  • Cisco Nexus 9396TX Switch
  • Cisco Nexus 9396PX Switch
  • Cisco Nexus 93120TX Switch
  • Cisco Nexus 9372TX-E Switch
  • Cisco Nexus 9504 Switch
  • Cisco Nexus 93108TC-EX Switch
  • Cisco Nexus 9508 Switch
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Known Affected Releases

13.2(4e)

Description (partial)

Symptom:
The spine node KIC database is missing the v4 default route from RIB. This causes in-band return traffic to drop on the way back to the border leaf nodes.

Conditions:
Default route is present in RIB.

spine# show ip route vrf common:vrf detail

IP Route Table for VRF "common:vrf"
'*' denotes best ucast next-hop
'**' denotes best mcast next-hop
'[x/y]' denotes [preference/metric]
'%<string>' in via output denotes VRF <string>

0.0.0.0/0, ubest/mbest: 2/0
    *via 13.13.13.13%overlay-1, [200/1088], 1d16h, bgp-65501, internal, tag 65501 (mpls-vpn)
         MPLS[0]: Label=0 E=0 TTL=0 S=0 (VPN)
         client-specific data: 2c20
         recursive next hop: 13.13.13.13/32%overlay-1
         extended route information: BGP origin AS 65501 BGP peer AS 66601 rw-vnid: 0 table-id: 0 rw-mac: 0
    *via 13.13.13.14%overlay-1, [200/1088], 1d16h, bgp-65501, internal, tag 65501 (mpls-vpn)
         MPLS[0]: Label=0 E=0 TTL=0 S=0 (VPN)
         client-specific data: 2c1d
         recursive next hop: 13.13.13.14/32%overlay-1
         extended route information: BGP origin AS 65501 BGP peer AS 66601 rw-vnid: 0 table-id: 0 rw-mac: 0

v4 default route entry is missing in the KIC database. v6 entry is present instead.

spine# cat proc/kic_database

Routing Table

Prefix (0) Routing Table
Prefix                  V6/Mode Ctx Id  RW Encap        GW Prefix
0000:0000:0000:0000:0000:0000:0000:0000/0       v6/ext  5       0       0000:0000:0000:0000:0000:ffff:0a00:d067
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Bug Details Include

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