802.1d : Spanning tree protocol (STP), 802.1w : rapid spanning tree protocol (RSTP)Max number of groups 12Max number of members per group 8Source & destination MAC based load balance4,096 VLAN IDs Max number of active VLANs per switch 256Port based VLANLink Layer Discovery Protocol (802.1ab)Snoop IGMP packets per VLANMax Number of multicast groups 128IGMP Snooping V1, 2, QuerierQoS on L3 using TOS field of IP packet headerDSCP to 802.1p mappingQoS on L2 layer using TCI field of VLAN headerStrict Priority QueuingWeighted Round Robin QueuingVoice VLAN / Auto QoSL2/L3/L4 based ACL (Max 512 ACL)Full/Half Duplex flow control, Back pressure for half duplexPort rate limiting, shaping, all traffic by bpsBroadcast packet rate controlMulticast packet rate controlRADIUS / TACACS+ authentication and accountingPort based authenticationMAC limitation per portMAC based port security (static/dynamic)HTTP, HTTPSSNMP v1/v2c/v3, Trap (RFC 1215)TCP/IP-based internets (RFC1213)RMON v1/2 (RFC2819/RFC4502)Received trafficTransmit trafficReceived and transmit trafficN to 1 MirrorSNTP Network timeConfiguration backup / restoreFirmware backup / upgradeIP Clustering up to 36 switches8.8 Gbps switching fabric capacity6.6 Mpps16M flash memory128M DRAM8K MAC address capacity10K MTU/ Jumbo frames supportAuto-negotiation, auto-MDI/MDIX150,000 MTBF Reset button10/100Base-TX Service ports24 10/100/1000 Base-T Ports per Unit4 Shared SFPPOE Support on all ports based on 802.3afPOE+ support based on 802.3at port 1-6POE Power Indication and safetyAuto disable on the excess of total powerDynamic Power Allocation185 Watt POE Power Budge19" Rack MountLGDES3026P