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Cisco Bug: CSCul45925 - IPv6 HSRP virtual address responds to traceroute

Last Modified

Feb 08, 2019

Products (153)

  • Cisco IOS
  • Cisco Catalyst 2960S-24PD-L Switch
  • Cisco Embedded Service 2020 24TC NCP B Switch
  • Cisco Catalyst 2960C-12PC-L Switch
  • Cisco Catalyst 3560CG-8TC-S Compact Switch
  • Cisco Embedded Service 2020 CON B Switch
  • Cisco Catalyst 2960X-24PS-L Switch
  • Cisco Catalyst 6500 Series Virtual Switching Supervisor Engine 720 with 10GE uplinks
  • Cisco Catalyst 3560X-48P-S Switch
  • Cisco Catalyst 3560X-48U-S Switch
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Known Affected Releases

15.1(2)SY 15.2(2)E6

Description (partial)

When a customer tried to traceroute from Server to remote network,
Server's default GW(Active side SUP2T) sends traceroute reply packet to server with IPv6 Virtual IP of HSRP.
This symptom happens under SUP2T(running 15.x)'s IPv6 only
- In the case of IPv4(running 15.x), the traceroute reply packet is sent with real IPv4 IP.
For 12.2(33)SXJ5(SUP720s) image, all of traceroute reply packet are sent with real IP(IPv4 and IPv6).

running 15.1(2)SY or 15.0(1)SY1
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