3com 4050 Specification Guide

3 C O M

®

S W I T C H   4 0 x 0   FA M I LY   D ATA   S H E E T

3

Switching capacity: 56 Gbps
Forwarding rate: 41.6 Mpps
Store-and-forward switching; latency 2.7 µs

MAC Address

12K MAC addresses

VLAN

30 VLANs (IEEE 802.1Q)

Link Aggregation

IEEE 802.3ad (LACP) and manual
13 trunk groups (up to four ports in each)

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 Suppression (3,000 pps threshhold)

Spanning Tree

IEEE 802.1D Spanning Tree Protocol (STP)
IEEE 802.1w Rapid Spanning Tree Protocol (RSTP)

• Backward-compatible with STP
• Fast-start mode
• Spanning tree enable/disable per port or per VLAN

Routes

Hardware-based routing
2,000 IP routes
100 Static Routes
5,000 ARP entires
64 IP interfaces 

IP Routing

IP Multinetting (multiple IP interfaces per VLAN)
CIDR (Classless Internet Domain Routing) 
RIP (Routing Information Protocol), v1 and v2
OSPF (Open Shortest Path First)

• 4 areas with 64 adjacencies
• ASBR support for static and default routes

Multicast

Filtering for 128 multicast groups
IGMP (Internet Group Management Protocol) snooping on Layer 2 interfaces
IGMP v1 and v2
IGMP Querier

Network protocol

DHCP Relay (Dynamic Host Configuration Protocol Relay)
UDP (User Datagram Protocol) Helper
ARP (Address Resolution Protocol)

Access Control Lists (ACLs)

VLAN-based ACLs

• Filtered on destination IP address / mask

Priority Queues

Four hardware queues per port
Strict priority queuing
Weighted Round Robin queuing

Traffic Prioritization

Priority based on:

• IEEE 802.1p CoS
• DSCP (DiffServ Code Point)
• TCP/UDP destination port number 
• Ethertype
• Default port priority
• Auto classification of 3Com NBX

®

telephony traffic

• IP Address / Protocol

Switch Login

Local or RADIUS authentication and management of switch passwords

Features