Switch chia mạng Cisco 20Port 10/100/1000Mbps – Cisco SG300-20

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Switch chia mạng 20Port 10/100/1000Mbps – Cisco SG300-20 là một thiết bị quan trọng dùng để kết nối các đoạn mạng với nhau theo mô hình mạng hình sao (Star). Theo mô hình này, switch đóng vai trò là thiết bị trung tâm, tất cả các máy tính đều được nối về đây trong một hệ thống mạng

Switch chia mạng Cisco 20Port 10/100/1000Mbps – Cisco SG300-20

Giới thiệu chung

Switch chia mạng Cisco 20Port 10/100/1000Mbps – Cisco SG300-20 là một thiết bị quan trọng dùng để kết nối các đoạn mạng với nhau theo mô hình mạng hình sao (Star). Theo mô hình này, switch chia mạng đóng vai trò là thiết bị trung tâm, tất cả các máy tính đều được nối về đây trong một hệ thống mạng


Tính năng switch mạng Cisco 20Port 10/100/1000Mbps – Cisco SG300-20
Product ID Number: SRW2016-K9
– 18 10/100/1000Mbps ports; 2 Combo mini-GBIC ports
– Gigabit Switching with Fiber Expansion and Browser Configurability
– Performance: Switching capacity 40.0 Gbps, nonblocking, Forwarding rate 29.76 mpps wire-speed performance
– Layer 2: Port grouping up to 8 ports per group with 16 candidate ports for each (dynamic) 802.3ad link aggregation, Number of VLANs 256 active VLANs (4096 range), Head-of-line (HOL) blocking HOL blocking prevention
– Layer 3: IPv4 routing Wirespeed routing of IPv4 packets, Up to 32 static routes and up to 32 IP interfaces, Classless Inter-Domain Routing (CIDR) support for CIDR.
QoS: Priority levels 4 hardware queues, Scheduling Priority queuing and weighted round-robin (WRR), Queue assignment based on DSCP and class of service (802.1p/CoS)

Cisco 20Port 10/100/1000Mbps – Cisco SG300-20 hiệu suất cao và sử dụng công nghệ tiên tiến

– Hỗ trợ cho các công nghệ tiên tiến: Tất cả các thiết bị chuyển mạch Cisco bao gồm các tính năng giao thông xử lý tiên tiến để giữ cho các ứng dụng chạy ở hiệu suất cao điểm.

– Tích hợp QoS thông minh trên tất cả các mô hình tự động ưu tiên dịch vụ chậm trễ nhạy cảm như thoại hoặc video để cải thiện hiệu suất mạng.

– Fast store-and-forward switching xác định các gói tin bị hư hỏng và ngăn ngừa chúng khỏi bị truyền qua mạng. Tất cả những tính năng chạy tự động, không có quản lý hoặc cấu hình yêu cầu

Cisco 20Port 10/100/1000Mbps – Cisco SG300-20 mang hiệu suất mà cao để chạy các ứng dụng viễn thông, bao gồm cả các dịch vụ video băng thông. Nâng cao công suất và hiệu suất truyền tải, cho phép bạn chuyển các tập tin lớn trong vài giây

Thông số kỹ thuật


Capacity in Mpps (64-byte packets): 29.76
Switching Capacity in Gbps: 40.0

Layer 2 Switching

Spanning Tree Protocol: Standard 802.1d Spanning Tree support
Fast convergence using 802.1w (Rapid Spanning Tree), enabled by default
Multiple Spanning Tree instances using 802.1s
Port Grouping: Support for IEEE 802.3ad Link Aggregation Control Protocol
• Up to 8 groups
• Up to 8 ports per group with 16 candidate ports for each (dynamic) 802.3ad link aggregation
VLAN: Support for up to 256 VLANs simultaneously (out of 4096 VLAN IDs)
Port-based and 802.1Q tag-based VLANs
MAC-based VLAN
Management VLAN
Private VLAN Edge, also known as protected ports, with multiple uplinks
Guest VLAN
Unauthenticated VLAN
Voice VLAN: Voice traffic is automatically assigned to a voice-specific VLAN and treated with appropriate levels of QoS
Q-in-Q VLAN: VLANs transparently cross a service provider network while isolating traffic among customers
Generic VLAN Registration Protocol/Generic Attribute Registration Protocol: Protocols for automatically propagating and configuring VLANs in a bridged domain
Dynamic Host Configuration Protocol Relay at Layer 2: Relay of DHCP traffic to DHCP server in different VLAN. Works with DHCP Option 82
Internet Group Management Protocol Versions 1, 2 and 3 snooping: IGMP limits bandwidth-intensive multicast traffic to only the requesters; supports 256 multicast groups (source-specific multicasting is also supported)
IGMP Querier: IGMP querier is used to support a Layer 2 multicast domain of snooping switches in the absence of a multicast router.
Head-of-Line (HOL) Blocking: HOL blocking prevention

Layer 3

IPv4 Routing: Wirespeed routing of IPv4 packets
Up to 32 static routes and up to 32 IP interfaces
Classless Inter-Domain Routing: Support for CIDR
DHCP Relay at Layer 3: Relay of DHCP traffic across IP domains
User Datagram Protocol Relay: Relay of broadcast information across Layer 3 domains for application discovery or relaying of BootP/DHCP packets


Secure Shell Protocol: SSH secures Telnet traffic to and from the switch; SSH v1 and v2 are supported
Secure Sockets Layer: SSL support: Encrypts all HTTPS traffic, allowing highly secure access to the browser-based management GUI in the switch
IEEE 802.1X (Authenticator role): RADIUS authentication and accounting, MD5 hash; guest VLAN; unauthenticated VLAN, single/multiple host mode and single/multiple sessions
Supports time-based 802.1X
Dynamic VLAN assignment
STP Bridge Protocol Data Unit Guard: A security mechanism to protect the network from invalid configurations.
A port enabled for BPDU Guard is shut down if a BPDU message is received on that port
Secure Core Technology: Ensures that the switch will receive and process management and protocol traffic no matter how much traffic is received
Layer 3 Isolation: Allow/disallow routing between IP subnets or directly connected IP networks
Layer 2 Isolation Private VLAN Edge (PVE) with community VLAN: PVE (also known as protected ports) provides Layer 2 isolation between devices in the same VLAN, supports multiple uplinks
Port Security: Locks MAC addresses to ports, and limits the number of learned MAC addresses
RADIUS/TACACS+: Supports RADIUS and TACACS authentication. Switch functions as a client
Storm Control: Broadcast, multicast and unknown unicast
DoS Prevention: DoS attack prevention
Congestion Avoidance: A TCP congestion avoidance algorithm is required to minimize and prevent global TCP loss synchronization.
ACLs: Support for up to 512 rules
Drop or rate limit based on source and destination MAC, VLAN ID or IP address, protocol, port, differentiated services code point/IP precedence, TCP/ UDP source and destination ports, 802.1p priority, Ethernet type, Internet Control Message Protocol packets, IGMP packets, TCP flag

Quality of Service

Priority Levels: 4 hardware queues
Scheduling: Strict priority and weighted round-robin
Queue assignment based on DSCP and class of service (802.1p/CoS)
Class of Service: Port based; 802.1p VLAN priority based; IPv4/v6 IP precedence/type of service/DSCP based; Differentiated Services (DiffServ); classification and re-marking ACLs, trusted QoS
Rate Limiting: Ingress policer; egress shaping and rate control; per VLAN, per port and flow based


IEEE 802.3 10BASE-T Ethernet, IEEE 802.3u 100BASE-TX Fast Ethernet, IEEE 802.3ab 1000BASE-T Gigabit Ethernet, IEEE 802.3ad LACP, IEEE 802.3z Gigabit Ethernet, IEEE 802.3x Flow Control, IEEE 802.1D (STP, GARP, and GVRP),IEEE 802.1Q/p VLAN, IEEE 802.1w RSTP, IEEE 802.1s Multiple STP, IEEE 802.1X Port Access Authentication, IEEE 802.3af, IEEE 802.3at, RFC 768, RFC 783, RFC 791, RFC 792, RFC 793, RFC 813, RFC 879, RFC 896, RFC 826, RFC 854, RFC 855, RFC 856, RFC 858, RFC 894, RFC 919, RFC 922, RFC 920, RFC 950, RFC 951, RFC 1042, RFC 1071, RFC 1123, RFC 1141, RFC 1155, RFC 1157, RFC 1350, RFC 1533, RFC 1541, RFC 1542, RFC 1624, RFC 1700, RFC 1867, RFC 2030, RFC 2616, RFC 2131, RFC 2132


IPv6: IPv6 host mode
IPv6 over Ethernet
Dual IPv6/IPv4 stack
IPv6 neighbor and router discovery
IPv6 stateless address auto-configuration
Path maximum transmission unit discovery
Duplicate address detection
ICMP version 6
IPv6 over IPv4 network with Intra-Site Automatic Tunnel Addressing Protocol support
IPv6 QoS: Prioritize IPv6 packets in hardware
IPv6 ACL: Drop or rate limit IPv6 packets in hardware
Multicast Listener Discovery Snooping: Deliver IPv6 multicast packets only to the required receivers
IPv6 Applications: Web/SSL, Telnet server/SSH, ping, traceroute, Simple Network Time Protocol, Trivial File Transfer Protocol, SNMP, RADIUS, syslog, DNS client, protocol-based VLANs
IPv6 RFCs Supported: RFC 2463 – ICMP version 6
RFC 3513 – IPv6 address architecture
RFC 4291 – IPv6 addressing architecture
RFC 2460 – IPv6 specification
RFC 2461 – Neighbor discovery for IPv6
RFC 2462 – IPv6 stateless address auto-configuration
RFC 1981 – Path MTU discovery
RFC 4007 – IPv6 scoped address architecture
RFC 3484 – Default address selection mechanism
RFC 4214 – ISATAP tunneling
RFC 4293 – MIB IPv6: Textual conventions and general group
RFC 3595 – Textual conventions for IPv6 flow label

Power Efficiency

Energy Detect: Automatically turns off power off on Gigabit Ethernet RJ-45 port when detecting link down
Active mode is resumed without loss of any packets when the switch detects the link up
Cable Length Detection: Adjusts the signal strength based on the cable length. It reduces the power consumption for cables shorter than 10 m

General Features

Jumbo Frames: Frame sizes up to 10 KB supported on 10/100 and Gigabit interfaces
MAC Table: Up to 8000 MAC addresses


Bonjour: The switch advertises itself using the Bonjour protocol
Link Layer Discovery Protocol (802.1ab) with LLDP-MED extensions: LLDP allows the switch to advertise its identification, configuration and capabilities to neighboring devices that store the data in a MIB. LLDP-MED is an enhancement to LLDP that adds the extensions needed for IP phones
Cisco Discovery Protocol: The switch advertises itself using the Cisco Discovery Protocol

Power Consumption

Power Savings Mode: Energy Detect
Short Reach
Power Consumption Worst Case: 110V=22.6W
Heat Dissipation (BTU/hr): 79.5


Total System Ports: 20 Gigabit Ethernet
RJ-45 Ports: 18 Gigabit Ethernet
Combo Ports (RJ-45 + SFP): 2 Gigabit Ethernet Combo


Reset button

Cabling Type

Unshielded twisted pair Category 5 or better for 10BASE-T/100BASE-TX; UTP Category 5 Ethernet or better for 1000BASE-T


System, Link/Act, Speed


16 MB


128 MB memory

Packet Buffer Memory

4 MB

Power Supply

100-240V 47-63 Hz, internal, universal


@ 40°C (hours): 144,237


UL (UL 60950), CSA (CSA 22.2), CE mark, FCC Part 15 (CFR 47) Class A

Dimensions (DxWxH)

17.3 x 1.45 x 7.97′ (440 x 36.83 x 202.5 mm)


4.78 lb (2.17 kg)

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