I found some entries in /var/log/messages concerning the issue:
Mar 24 20:23:00 qfx5110 fpc0 qsfp-0/0/48 plugged in Mar 24 20:23:02 qfx5110 vccpd[3524]: Creation of ifl vcp-255/0/48.32768 Success Mar 24 20:23:02 qfx5110 fpc0 LBCM-L2,brcm_l2_update_stk_ports_in_bmp(),473:mac_set disable failed port 49 : error Invalid parameter Mar 24 20:23:02 qfx5110 fpc0 LBCM-L2,brcm_l2_update_stk_ports_in_bmp(),487:mac_set enable failed port 49 : error Invalid parameter Mar 24 20:23:02 qfx5110 fpc0 LBCM-L2,brcm_port_init_def(),1130:Setting L2 Learn (unit 0, port_num 49), learn_flg 4 Mar 24 20:23:03 qfx5110 fpc0 LBCM-L2,brcm_port_init_def(),1130:Setting L2 Learn (unit 0, port_num 49), learn_flg 4 Mar 24 20:23:03 qfx5110 fpc0 BRCM_COS_HALP(brcm_cos_setup_queue_gportids:284): Failed to setup gport for queue 0 of ifd 131 Mar 24 20:23:03 qfx5110 fpc0 BRCM_COS_HALP(brcm_cos_setup_queue_gportids:285): SDK API ERROR : No resources for operation Mar 24 20:23:03 qfx5110 fpc0 BRCM_COS_HALP(brcm_cos_sched_node_setup:508): Failed to attach gport for S1 scheduler of ifd_index 131 to port. Error:Entry exists Mar 24 20:23:03 qfx5110 fpc0 BRCM_COS_HALP(brcm_cos_fc_q_map_update_ifd:439): SDK API ERROR : Invalid parameter FC : 0 Queue 0, 131(vcp-255/0/48) Mar 24 20:23:03 qfx5110 fpc0 BRCM_COS_HALP(brcm_cos_fc_q_map_update_ifd:453): SDK API ERROR : Invalid parameter FC : 0 Queue 11, 131(vcp-255/0/48) Mar 24 20:23:03 qfx5110 fpc0 BRCM_COS_HALP(brcm_cos_fc_q_map_update_ifd:505): SDK API ERROR : Invalid parameter, 131(vcp-255/0/48) Mar 24 20:23:03 qfx5110 fpc0 BRCM_COS_HALP(brcm_cos_fc_q_map_update_ifd:515): SDK API ERROR : Invalid port, 131(vcp-255/0/48) Mar 24 20:23:03 qfx5110 fpc0 BRCM_COS_HALP(brcm_cos_fc_q_map_update_ifd:521): phy port c1d23638 : numq : -928516552 flags: c1543948, 131(vcp-255/0/48) Mar 24 20:23:03 qfx5110 fpc0 : dcbcm_drv_port_link_conf Setting speed 40000 for port 49 Mar 24 20:23:03 qfx5110 fpc0 : dcbcm_drv_port_mtu_conf: Port Frame Max Set failed for port 49 error Invalid parameter Mar 24 20:23:03 qfx5110 fpc0 BRCM_COS_HALP(brcm_cos_halp_ifd_setup:1275): cos_halp_ifd 131(vcp-255/0/48) already allocated Mar 24 20:23:03 qfx5110 fpc0 BRCM_COS_HALP(brcm_cos_bind_sched_map_ifd:2645): Not able to set the gport_s2 from the cos_halp_ifd for ifd 131(vcp-255/0/48) Mar 24 20:23:03 qfx5110 fpc0 COS(cos_final_scheduler_bind_add_action:1025): Platform failed to bind scheduler map 2 to element.cos_element_type 2 index 131) Mar 24 20:23:03 qfx5110 fpc0 BRCM_COS_HALP(brcm_cos_unbind_scheduler_map_ifd:3199): Not able to get the gport_s2 from the cos_halp_ifd for ifd 131(vcp-255/0/48)
Is it possible, that i ran into a bug of the current firmware? qfx5110 are brand new and this is as far as i ve seen the initial software release.