5.15 and 6.xx and everything works perfectly. Can you reproduce this issue w/o zebra/frr?
On Tue, 30 Dec 2025 at 02:27, monu Sharma via lists.fd.io <monu0952= [email protected]> wrote: > Hi Stanislav > > I tried disabling *zebra nexthop kernel enable* in FRR (to avoid > NHID-related events), but VPP is *still missing some RTM_DELROUTE events*. > > FRR logs confirm that *RTM_DELROUTE messages are sent correctly for all > routes*, but VPP does not receive/process all of them. > > Could you please let me know *which Linux kernel version you are using* > on your setup? > > Thanks. > Manoj > > On Tuesday, December 23, 2025 at 11:19:56 PM GMT+5:30, Stanislav Zaikin > via lists.fd.io <[email protected]> wrote: > > > Hello Manoj, > > You can try to disable nethops in zebra using this command "no zebra > nexthop kernel enable". > > Another option is to support nhids in the LCP plugin. I added a couple of > years ago nhid support in libnl and also have somewhere a patch to vpp that > makes libnl an explicit external dependency with pinning to a specific > version (in case the system libnl is too old). > > Also, I tried to integrate linux nexthops in lcp and miserably failed :) > After that I just switched to my custom control plane and didn't need those > nhid support anymore. > > But maybe you can add this support if you want to. Contributions are > welcomed. > > On Mon, 22 Dec 2025 at 16:26, monu Sharma via lists.fd.io <monu0952= > [email protected]> wrote: > > Hi, > > We are integrating VPP with FRR via netlink (RTM_NEWROUTE / RTM_DELROUTE) > and have observed an issue in *VPP 24.10* regarding *nexthop (NHID) > delete handling*. > Observation > > When FRR withdraws BGP routes, Linux sometimes emits *RTM_DELNEXTHOP* events > (NHID delete) *sometimes* *without* corresponding *RTM_DELROUTE* messages. > > Example netlink event observed: > > RTNL NEXTHOP DELETE > nhid=1331 family=2 proto=zebra oif=12 > gw=192.168.12.21 > > Routes referencing this NHID (e.g.): > > 192.168.0.0/24 nhid 1331 encap mpls 24021 via 192.168.12.21 dev ens6.1012 > proto bgp > > are removed from the Linux kernel, but *VPP does not delete the > corresponding FIB entry*, since NHID delete events are currently not > handled. > Impact > > - > > VPP FIB can retain *stale routes* > - > > Leads to *state mismatch* between Linux kernel and VPP > - > > Especially visible with FRR/Zebra + MPLS + nexthop objects > > Expectation > > When *RTM_DELNEXTHOP* is received: > > - > > VPP (or plugins consuming netlink) should invalidate and remove all > routes associated with the deleted NHID > - > > Or at least provide a mechanism to track NHID → route mappings and act > on NHID deletion > > Question > > Is the lack of RTM_DELNEXTHOP handling a known limitation? > Are there plans to add native NHID tracking and cleanup in VPP, ? Any > guidance or recommended approach would be appreciated. > > > Please find ubuntu and kernel version. > uname -a > Linux -dev 5.15.0-101-generic #111-Ubuntu SMP Tue Mar 5 20:16:58 UTC 2024 > x86_64 x86_64 x86_64 GNU/Linux > > dpkg -l | grep linux-image > ii linux-image-5.15.0-101-generic 5.15.0-101.111 > amd64 Signed kernel image generic > pi linux-image-5.15.0-97-generic 5.15.0-97.107 > amd64 Signed kernel image generic > cat /etc/os-release > PRETTY_NAME="Ubuntu 22.04.3 LTS" > NAME="Ubuntu" > VERSION_ID="22.04" > VERSION="22.04.3 LTS (Jammy Jellyfish)" > VERSION_CODENAME=jammy > ID=ubuntu > ID_LIKE=debian > HOME_URL="https://www.ubuntu.com/"; > SUPPORT_URL="https://help.ubuntu.com/"; > BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"; > PRIVACY_POLICY_URL=" > https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"; > UBUNTU_CODENAME=jammy > > Thanks & regards, > Manoj > > > > > > > > -- > Best regards > Stanislav Zaikin > > > > > > > -- Best regards Stanislav Zaikin
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