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Type: Bug
Resolution: Done-Errata
Priority: Normal
Fix Version/s: rhel-9.4
Affects Version/s: rhel-9.2.0
Component/s: NetworkManager
Labels:
- MigratedToJIRA
- NMT-Support-Escalation

Fixed in Build:
NetworkManager-1.45.9-1.el9
Severity:
Normal
Epic Link:
NMT-225

Pool Team:

sst_network_management
Sub-System Group:

ssg_networking

Internal Target Milestone:
22
Story Points:
1

Status Summary:

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Customer/Partner	Jira ID	Case ID	Status	Details
OpenShift	~~RHEL-1682~~	No customer case		When creating an ECMP route with nmstate on NetworkManager, an extra static non-ECMP route appears alongside the intended ECMP route. This is due to NetworkManager not removing the pre-existing single hop route when merging to the desired ECMP route. A fix is proposed to ensure leftover routes are removed when merging to a new ECMP with multiple next hops. The customer has a workaround and the issue is being fixed and is waiting for QA verification

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Customer/Partner Jira ID Case ID Status Details OpenShift RHEL-1682 No customer case When creating an ECMP route with nmstate on NetworkManager, an extra static non-ECMP route appears alongside the intended ECMP route. This is due to NetworkManager not removing the pre-existing single hop route when merging to the desired ECMP route. A fix is proposed to ensure leftover routes are removed when merging to a new ECMP with multiple next hops. The customer has a workaround and the issue is being fixed and is waiting for QA verification

ACKs Check:

QE ack, Dev ack
Target Version:

rhel-9.4
Blocked:
False
Blocked Reason:

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None

Show
None
Sprint:
NMT - RHEL 8.10/9.4 DTM 00, NMT - RHEL 8.10/9.4 DTM 14

Git Pull Request:
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/1760
Preliminary Testing:
Pass
Test Link:
https://gitlab.freedesktop.org/NetworkManager/NetworkManager-ci/-/merge_requests/1483
Errata Link:
https://errata.devel.redhat.com/advisory/120156

Release Note Type:
If docs needed, set a value

Experience:
Architecture:

x86_64
Bugzilla Bug:
RHBZ: 2234425

PX Impact Score:
PX Priority Data:
PX Review Complete:
SFDC Cases Counter:
SFDC Cases Links:

Description of problem:

When creating ECMP route via nmstate, we noticed extra static non-ECMP route been created beside the ECMP one:

198.51.100.0/24 via 192.0.2.1 dev dummy1 proto static metric 150
198.51.100.0/24 proto static metric 150
nexthop via 192.0.2.1 dev dummy1 weight 2
nexthop via 192.0.2.2 dev dummy2 weight 25

Version-Release number of selected component (if applicable):
NetworkManager-1.45.1-32541.copr.194b381d38.el9.x86_64

How reproducible:
100%

Steps to Reproduce:
1.


echo '
---
interfaces:
  - name: dummy1
    type: dummy
    state: up
    ipv4:
      address:
      - ip: 192.0.2.251
        prefix-length: 24
      dhcp: false
      enabled: true
  - name: dummy2
    type: dummy
    state: up
    ipv4:
      address:
      - ip: 192.0.2.252
        prefix-length: 24
      dhcp: false
      enabled: true

routes:
  config:
  - destination: 198.51.100.0/24
    metric: 150
    next-hop-address: 192.0.2.1
    next-hop-interface: dummy1
    weight: 2
    table-id: 254
  - destination: 198.51.100.0/24
    metric: 150
    next-hop-address: 192.0.2.2
    next-hop-interface: dummy2
    weight: 25
    table-id: 254' | sudo nmstatectl set -

2. ip route show
3.

Actual results:

198.51.100.0/24 via 192.0.2.1 dev dummy1 proto static metric 150
198.51.100.0/24 proto static metric 150
nexthop via 192.0.2.1 dev dummy1 weight 2
nexthop via 192.0.2.2 dev dummy2 weight 25

Expected results:

198.51.100.0/24 proto static metric 150
nexthop via 192.0.2.1 dev dummy1 weight 2
nexthop via 192.0.2.2 dev dummy2 weight 25

Additional info:

`sudo nmcli c up dummy1` will clear the extra non-ECMP route.

external trackers

PnT-DevOps Jira NMT-544

PnT-DevOps Jira RHELPLAN-158606

Red Hat Issue Tracker OCPBUGS-17698

Red Hat Issue Tracker RHELPLAN-166386

links to

NMCI MR

RHBA-2023:120156 NetworkManager bug fix and enhancement update