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Cisco Bug: CSCvu71940 - Cisco 8000 series router forwards ipv6 packets destined to ::1 when ipv6 default route is configured

Last Modified

Jul 16, 2020

Products (1)

  • Cisco 8000 Series Routers

Known Affected Releases


Description (partial)

Cisco 8000 series router forwards a ipv6 packet which is destined to a Loopback ipv6 address (::1/128)
This happens when a ipv6 default route is setup

For example: the following is the default route configuration
 router static
  address-family ipv6 unicast
   ::/0 3000::1

Under this condition, a packet destined to ::1 is forwarded to 3000::1

The issue is observed with either the Global routing table or the VRF table
 router static
  vrf vrf1
    address-family ipv6 unicast
      ::/0 300A::1

Under this condition, a packet destined to ::1 in the vrf1 routing table is forwarded to 300A::1

This is seen on a Cisco 8000 series router.
All IOS-XR releases are affected
A default ipv6 static route is added to forward all unknown ipv6 prefixes
Both Global routing table and VRF table will observe this.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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