Datasheet

Performance
Switching capacity: SuperStack 3 Switch 3870 24-port, 108 Gbps; Switch 3870
48-port, 156 Gbps
Forw
arding rate: 24-port, 80 Mpps; 48-port, 115 Mpps
Store-and-forward switching
Layer 2 Switching
MAC Address 16K MAC addresses
1024 secure MAC addresses
VLAN 255 VLANs (IEEE 802.1Q)
Link Aggregation IEEE 802.3ad (LACP), Gigabit ports only
32 trunk groups (up to 8 ports in each), trunking across stacked units
Auto-negotiation Auto-negotiation of port speed, duplex, and connection (MDI/MDIX)
Traffic control IEEE 802.3x full-duplex flow control
Back pressure flow control for half-duplex
Broadcast Storm Control (500-200,000 pps limit)
Spanning Tree IEEE 802.1w Rapid Spanning Tree Protocol (RSTP)
Backward-compatible with STP
Fast-start mode
Spanning tree enable/disable per port
Multicast Snooping Filtering for 64 multicast groups
IGMP v1 and v2
IGMP Querier
Jumbo Frames Supports 9K packets
Stacking
Switched 40Gbps on each switch
Up to 8 units high
Resilient loop back
Hot-swap units
Single IP address for stack management
Convergence
Priority Queues Eight hardware queues per port
Strict priority
Weighted Round Robin queuing
Traffic Prioritization Priority based on:
• DSCP (DiffServ Code Point)
• IEEE 802.1p Class of Service (CoS) priority
• TCP/UDP destination port number
• Default port priority
• Auto classification of 3Com NBX
®
telephony traffic
Bandwidth Management Port-based bandwidth management:
• 1 Mbps incr
em
ents (Gig
a
bit ports)
Features
3COM
®
SUPERSTACK
®
3 SWITCH 3870 24- AND 48-PORT STACKABLE SWITCHES DATA SHEET