FW: 4.22.R001 1. Added "ip igmp snooping igmp-message-trap-mode { common | interface }" FW: 4.22.R003 1. Fixed issue with the output information in sh ip bgp summury. 2. Fixed issue with using PBR. FW: 4.22.R005 1. Fixed issue with using BGP distribute-list. FW: 4.22.R007 1. Cannot recognize the combo port is connected to Ethernet or Fiber port via MIB of DGS-6600-24SC2XS-C. FW: 4.22.R008 1. Fixed issue with blocking DHCP packet. FW: 4.22.R009 1. Fixed issue with using VRRP. FW: 4.22.R016 1. Error msg while set snmp-server. FW: 4.22.R017 1. Fixed issue with using RSTP.