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Cisco Bug: CSCvt75268 - IPv6 routes use wrong VLAN as next hop

Last Modified

Sep 03, 2020

Products (65)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 93600CD-GX Switch
  • Cisco Nexus 3548-X Switch
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 3548 Switch
  • Cisco Nexus 92348GC-X Switch
  • Cisco Nexus 3636C-R Switch
  • Cisco Nexus 9396PX Switch
  • Cisco Nexus 31108TC-V Switch
  • Cisco Nexus 3548-XL Switch
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Known Affected Releases


Description (partial)

After creating an SVI, all of the IPv6 routes with the next hop in that SVI (including host routes and the route to the SVI's own address) will show an incorrect interface in "show ipv6 route ...". The interface shown in the output might have been disabled or deleted previously. 

This doesn't affect IPv4. 


2a00:1:2:10:::10/128, ubest/mbest: 1/0, attached
    *via 2a00:1:2:10:::10, Vlan10, [190/0], 00:26:24, hmm

interface Vlan20
  ipv6 address 2a00:1:2:10:::10/64

The problem happens extremely rarely after deleting a subset of SVIs, and then creating new ones.
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