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From: bugzilla@dpdk.org
To: dev@dpdk.org
Subject: [DPDK/ethdev Bug 1920] Multicast packets dropped with multicast mode
 enabled on CX6 NIC
Date: Tue, 31 Mar 2026 16:17:08 +0000
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http://bugs.dpdk.org/show_bug.cgi?id=3D1920

            Bug ID: 1920
           Summary: Multicast packets dropped with multicast mode enabled
                    on CX6 NIC
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: dmarx@iol.unh.edu
  Target Milestone: ---

testpmd> set allmulti all off
testpmd> show port info all

********************* Infos for port 0  *********************
MAC address: B8:3F:D2:52:B7:24
Device name: 0000:81:00.0
Driver name: mlx5_pci
Firmware-version: 26.42.1000
Devargs:=20
Connect to socket: 1
memory allocation on the socket: 1
Link status: up
Link speed: 25 Gbps
Link duplex: full-duplex
Autoneg status: On
MTU: 1500
Promiscuous mode: disabled
Allmulticast mode: disabled

Sent packet: Ether(dst=3D'01:00:5E:00:00:01',
src=3D'a0:88:c2:95:79:c4')/IP(src=3D'192.168.100.3',
dst=3D'192.168.101.3')/Raw(load=3Db'xxxxx')

sudo ethtool -i enp129s0f0np0
driver: mlx5_core
version: 24.07-0.6.1
firmware-version: 26.42.1000 (MT_0000000531)
expansion-rom-version:=20
bus-info: 0000:81:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: yes

uname -m
x86_64

DPDK version: 26.03 rc2

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