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Maniphest T7703

DHCP default route lost in VRF when no static route defined
Not ApplicablePublicBUG
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Description

Looks like the same issue as T6991, only it happens in VRF.

Steps to reproduce:

  • Create interface with DHCP and assign to VRF
  • Have no protocols static entry under VRF
  • Observe DHCP default route exists in show ip route vrf ...
  • Make a change to the VRF that regenerates FRR config, for example set vrf ... ipv6 disable-forwarding and commit
  • Observe DHCP default route no longer exists in show ip route vrf ...

Details

Version
2025.07.25-0021-rolling
Is it a breaking change?
Perfectly compatible
Issue type
Bug (incorrect behavior)

Related Objects

Event Timeline

dsg created this task.Aug 10 2025, 1:41 AM
pasik subscribed.Aug 10 2025, 8:29 AM
Viacheslav triaged this task as High priority.Aug 11 2025, 9:18 AM
Viacheslav changed the task status from Open to Needs testing.Jan 20 2026, 2:26 PM
Viacheslav subscribed.

@dsg, could you re-check the latest rolling?

a.pidnebesny subscribed.Jan 30 2026, 4:46 PM

Tested on VyOS 2026.01.28-0022-rolling.

Configuration :

interfaces {
    ethernet eth1 {
        address dhcp
        hw-id 0c:92:ab:bb:00:01
        offload {
            gro
            gso
            sg
            tso
        }
        vrf RED
    }
}

vrf {
    name RED {
        ipv6 {
            disable-forwarding
        }
        table 110
    }
}

Steps to reproduce were the same

Additionally test:

  • reboot persistence
  • interface flap

No issues observed on this build.

Viacheslav closed this task as Not Applicable.Feb 2 2026, 1:11 PM