You can use the Tx-only functionality to have only a Transmit link on the tool ports
This feature is only supported on Broadcom platforms
pbnoscli# configure terminal
pbnoscli(config)# interface ethernet Ethernet4/1
pbnoscli(config-if)# tr
transmit-only Activate tx-only mode
pbnoscli(config-if)# transmit-only
pbnoscli(config-if)# end
pbnoscli# show interface npb Ethernet4/1
===================================
Interface : Ethernet4/1
===================================
Ingress-vlan : 18
Egress-tagging : disable
Transmit-only : enable
pbnoscli#
pbnoscli# show running-config
configure terminal
interface ethernet Ethernet4/1
transmit-only
!
interface mgmt
ip address 10.4.4.53/23 gateway 10.4.4.1
!
pbnoscli#