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Do not verify the format of TLV. Leave that to lldpd. These lldpd config entries: config custom-tlv list ports 'eth0' option tlv 'replace oui 33,44,55 subtype 254 oui-info 55,55,55,55,55' config custom-tlv option tlv 'oui 33,44,44 subtype 232' list ports 'br-lan' list ports 'eth0' config custom-tlv # oui-info truncated option tlv 'add oui 33,44,33 subtype 66 oui-info 5555555555' config custom-tlv option tlv 'add oui 33,44,31 subtype 44' config custom-tlv # invalid oui option tlv 'add oui 3322 subtype 79' config custom-tlv # invalid oui option tlv 'oui 3312 subtype 74' Produce the following lldpd.conf content: configure ports eth0 lldp custom-tlv replace oui 33,44,55 subtype 254 oui-info 55,55,55,55,55 configure ports br-lan,eth0 lldp custom-tlv oui 33,44,44 subtype 232 configure lldp custom-tlv add oui 33,44,33 subtype 66 oui-info 5555555555 configure lldp custom-tlv add oui 33,44,31 subtype 44 configure lldp custom-tlv add oui 3322 subtype 79 configure lldp custom-tlv oui 3312 subtype 74 And lldpd (v1.0.13 on v22) logs the following: Sat Mar 16 19:11:39 2024 daemon.info lldpd[10916]: custom TLV op replace oui 33:44:55 subtype fe Sat Mar 16 19:11:39 2024 daemon.info lldpd[10916]: custom TLV op add oui 33:44:44 subtype e8 Sat Mar 16 19:11:39 2024 daemon.info lldpd[10916]: custom TLV op add oui 33:44:33 subtype 42 Sat Mar 16 19:11:39 2024 daemon.info lldpd[10916]: custom TLV op add oui 33:44:33 subtype 42 Sat Mar 16 19:11:39 2024 daemon.info lldpd[10916]: custom TLV op add oui 33:44:31 subtype 2c Sat Mar 16 19:11:39 2024 daemon.info lldpd[10916]: custom TLV op add oui 33:44:31 subtype 2c Sat Mar 16 19:11:39 2024 daemon.warn lldpcli[10915]: invalid OUI value '3322' Sat Mar 16 19:11:39 2024 daemon.info lldpcli[10915]: an error occurred while executing last command Sat Mar 16 19:11:39 2024 daemon.warn lldpcli[10915]: invalid OUI value '3312' Sat Mar 16 19:11:39 2024 daemon.info lldpcli[10915]: an error occurred while executing last command Sat Mar 16 19:11:39 2024 daemon.info lldpcli[10915]: lldpd should resume operations ( The last two TLV are invalid: their oui must be three hex bytes, comma separated. Only the first hex byte of oui-info 5555555555 is used ) Depends on #14867 and its release version bump Tested on: 22.03.6 Signed-off-by: Paul Donald <newtwen+github@gmail.com>