3Com® SuperStack 3 3870 Switch 3CR17451-91
De 3Com 3CR17451-91 heeft 48-poorten GIG Gigabit Ethernet switch combines wirespeed Layer 2 switching with stackability up to eight units high via a 40Gbps stacking architecture for impressive scalability to 384 ports total. The hardware supports a 10-Gigabit expansion slot and is Layer 3-capable for investment protection.
Performance Switching capacity:SuperStack 3 Switch 3870
- 24-port, 108 Gbps; Switch 3870 48-port, 156 Gbps
- Forwarding rate: 24-port, 80 Mpps; 48-port, 115 Mpps
- Store-and-forward switching
Layer 2 Switching
AC 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 increments (Gigabit ports) F
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