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CBS250-24T-4G Cisco L2-Managed Gigabit Switch 24 Port, 4 SFP
  • CBS250-24T-4G Cisco L2-Managed Gigabit Switch 24 Port, 4 SFP

CBS250-24T-4G Cisco L2-Managed Gigabit Switch 24 Port, 4 SFP


Cisco CBS250-24T-4G L2-Managed Gigabit Switch 24 Port Gigabit, 4 Port SFP รองรับ VLAN, Spanning Tree Protocol (STP), Access Control List (ACL), Quality Of Service (QoS), IPv4/IPv6 static routing


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Cisco Business 250 Series Datasheet

คู่มือการ Config VLAN บน Cisco CBS Switch Series
คู่มือการ Config VLAN Switch Cisco CBS Series - Access Point Cisco CBW Serie

คู่มือการทำ L3-Based VLAN บนอุปกรณ์ Cisco SG350 Series แบบ GUI

คู่มือการทำ L3 Based VLAN บนอุปกรณ์ Cisco SG350 Series

Product Specification


Cisco CBS250-24T-4G L2-Managed Gigabit Switch 24 Port Gigabit, 4 Port SFP รองรับ VLAN, Spanning Tree Protocol (STP), Access Control List (ACL), Quality Of Service (QoS), IPv4/IPv6 static routing

Capacity in millions of packets per second (mpps) (64-byte packets)

41.66 mpps

Switching capacity in gigabits per second (Gbps)

56 Gbps

Layer 2 switching

Spanning Tree Protocol (STP)

Standard 802.1d spanning tree support
Fast convergence using 802.1w (Rapid Spanning Tree Protocol [RSTP]), enabled by default
Multiple spanning tree instances using 802.1s (MSTP); 8 instances are supported
Per-VLAN Spanning Tree Plus (PVST+); 126 instances are supported
Rapid PVST+ (RPVST+); 126 instances are supported

Port grouping/link aggregation

Support for IEEE 802.3ad Link Aggregation Control Protocol (LACP)
Up to 4 groups
Up to 8 ports per group with 16 candidate ports for each (dynamic) 802.3ad Link Aggregation Group (LAG)


Support for up to 255 active VLANs simultaneously
Port-based and 802.1Q tag-based VLANs
Management VLAN
Guest VLAN

Voice VLAN

Voice traffic is automatically assigned to a voice-specific VLAN and treated with appropriate levels of QoS. Auto voice capabilities deliver networkwide zero-touch deployment of voice endpoints and call control devices

Generic VLAN Registration Protocol (GVRP) and Generic Attribute Registration Protocol (GARP)

Protocols for automatically propagating and configuring VLANs in a bridged domain

IGMP (versions 1, 2, and 3) snooping

Internet Group Management Protocol (IGMP) limits bandwidth-intensive multicast traffic to only the requesters; supports 255 multicast groups (source-specific multicasting is also supported)

IGMP querier

Used to support a Layer 2 multicast domain of snooping switches in the absence of a multicast router

HOL blocking

Head-of-Line (HOL) blocking prevention

Loopback detection

Provides protection against loops by transmitting loop protocol packets out of ports on which loop protection has been enabled. It operates independently of STP.

Layer 3 routing

IPv4 routing

Wire-speed routing of IPv4 packets
Up to 32 static routes and up to 16 IP interfaces

IPv6 routing

Wire-speed routing of IPv6 packets

Layer 3 interface

Configuration of Layer 3 interface on physical port, LAG, VLAN interface, or loopback interface

Classless Interdomain Routing (CIDR)

Support for CIDR

Dynamic Host Configuration Protocol (DHCP) relay at Layer 3

Relay of DHCP traffic across IP domains

User Datagram Protocol (UDP) relay

Relay of broadcast information across Layer 3 domains for application discovery or relaying of Bootstrap Protocol (BootP)/DHCP packets


Secure Sockets Layer (SSL)

SSL encrypts all HTTPS traffic, allowing secure access to the browser-based management GUI in the switch

Secure Shell (SSH) Protocol

SSH is a secure replacement for Telnet traffic. Secure Copy (SCP) also uses SSH. SSH v1 and v2 are supported.

IEEE 802.1X (authenticator role)

Remote Authentication Dial-In User Service (RADIUS) authentication, guest VLAN, single/multiple host mode, and single/multiple sessions

STP loopback guard

Provides additional protection against Layer 2 forwarding loops (STP loops)

Secure Core Technology (SCT)

Ensures that the switch will receive and process management and protocol traffic no matter how much traffic is received

Secure Sensitive Data (SSD)

A mechanism to manage sensitive data (such as passwords, keys, and so on) securely on the switch, populating this data to other devices, and secure autoconfig. Access to view the sensitive data as plain text or encrypted is provided according to the user-configured access level and the access method of the user

Trustworthy systems

Trustworthy systems provide a highly secure foundation for Cisco products

Run-time defenses (Executable Space Protection [X-Space], Address Space Layout Randomization [ASLR], Built-In Object Size Checking [BOSC])

Port security

Ability to lock source MAC addresses to ports and limit the number of learned MAC addresses


Supports RADIUS authentication for management access. Switch functions as a client.

Storm control

Broadcast, multicast, and unknown unicast

DoS prevention

Denial-of-Service (DoS) attack prevention

Multiple user privilege levels in CLI

Level 1, 7, and 15 privilege levels

Access Control Lists (ACLs)

Support for up to 512 rules

Drop or rate limit based on source and destination MAC, VLAN ID or IPv4 or IPv6 address, IPv6 flow label, protocol, port, Differentiated Services Code Point (DSCP)/IP precedence, TCP/UDP source and destination ports, 802.1p priority, Ethernet type, Internet Control Message Protocol (ICMP) packets, IGMP packets, TCP flag; ACL can be applied on both ingress and egress sides

Time-based ACLs supported

Quality of service (QoS)

Priority levels

8 hardware queues


Strict priority and Weighted Round-Robin (WRR) 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 (ToS)/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

Congestion avoidance

A TCP congestion avoidance algorithm is required to reduce and prevent global TCP loss synchronization



IPv6 host mode
IPv6 over Ethernet
Dual IPv6/IPv4 stack
IPv6 Neighbor Discovery (ND)
IPv6 stateless address auto configuration
Path Maximum Transmission Unit (MTU) discovery
Duplicate Address Detection (DAD)
Internet Control Message Protocol (ICMP) version 6
IPv6 over IPv4 network with Intrasite Automatic Tunnel Addressing Protocol (ISATAP) support
USGv6 and IPv6 Gold Logo certified

IPv6 QoS

Prioritize IPv6 packets in hardware


Drop or rate limit IPv6 packets in hardware

Multicast Listener Discovery (MLD v1/2) snooping

Deliver IPv6 multicast packets only to the required receivers

IPv6 applications

Web/SSL, Telnet server/SSH, Ping, Traceroute, Simple Network Time Protocol (SNTP), Trivial File Transfer Protocol (TFTP), Simple Network Management Protocol (SNMP), Remote Authentication Dial-In User Service (RADIUS), Syslog, DNS client, DHCP client, DHCP autoconfig


Web user interface

Built-in switch configuration utility for easy browser-based device configuration (HTTP/HTTPS). Supports configuration, wizards, system dashboard, system maintenance, and monitoring

Basic and advanced mode for maximum operational efficiency


SNMP versions 1, 2c, and 3 with support for traps, and SNMP v3 User-based Security Model (USM)

Remote monitoring (RMON)

Embedded RMON software agent supports 4 RMON groups (history, statistics, alarms, and events) for enhanced traffic management, monitoring, and analysis

IPv4 and IPv6 dual stack

Coexistence of both protocol stacks to ease migration

Firmware upgrade

Web browser upgrade (HTTP/HTTPS) and TFTP and upgrade over SCP running over SSH
Dual images for resilient firmware upgrades

Port mirroring

Traffic on a port can be mirrored to another port for analysis with a network analyzer or RMON probe. Up to 4 source ports can be mirrored to one destination port

VLAN mirroring

Traffic from a VLAN can be mirrored to a port for analysis with a network analyzer or RMON probe. Up to 4 source VLANs can be mirrored to one destination port

Dynamic Host Configuration Protocol (DHCP) (options 12, 66, 67, 129, and 150)

DHCP options facilitate tighter control from a central point (DHCP server), to obtain IP address, autoconfiguration (with configuration file download), DHCP Relay, and host name

Secure Copy (SCP)

Securely transfers files to and from the switch

Autoconfiguration with SCP file download

Enables mass deployment with protection of sensitive data

Text-editable configs

Config files can be edited with a text editor and downloaded to another switch, facilitating easier mass deployment


Simplified configuration of QoS and security capabilities

Auto Smartports

Automatically applies the intelligence delivered through the Smartports roles to the port based on the devices discovered over Cisco Discovery Protocol or LLDP-MED. This facilitates zero-touch deployments.

Text view Command-Line Interface (CLI)

Scriptable CLI. A full CLI as well as a menu-based CLI is supported. User privilege levels 1, 7, and 15 are supported for the CLI.

Cloud services

Support for Cisco Business Dashboard and Cisco Active Advisor

Embedded Probe for Cisco Business Dashboard

Support for embedded probe for Cisco Business Dashboard running on the switch. Eliminates the need to set up a separate hardware or virtual machine for the Cisco Business Dashboard Probe on site.

Cisco Network Plug and Play (PnP) agent

The Cisco Network Plug and Play solution provides a simple, secure, unified, and integrated offering to ease new branch or campus device rollouts or for provisioning updates to an existing network. The solution provides a unified approach to provision Cisco routers, switches, and wireless devices with a near-zero-touch deployment experience.

Supports Cisco PnP Connect


Localization of GUI and documentation into multiple languages

Login banner

Configurable multiple banners for web as well as CLI

Other management

Traceroute; single IP management; HTTP/HTTPS; RADIUS; port mirroring; TFTP upgrade; DHCP client; Simple Network Time Protocol (SNTP); cable diagnostics; Ping; syslog; Telnet client (SSH secure support); automatic time settings from Management Station



The switch advertises itself using the Bonjour protocol

Link Layer Discovery Protocol (LLDP) (802.1ab) with LLDP-MED extensions

Link Layer Discovery Protocol (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. It also learns the connected device and its characteristics using Cisco Discovery Protocol

Power over Ethernet (PoE)

802.3at PoE+ and 802.3af PoE delivered over any of the RJ-45 ports within the listed power budgets

The following switches support 802.3at PoE+, 802.3af, and Cisco prestandard (legacy) PoE. Maximum power of 30.0W to any 10/100 or Gigabit Ethernet port, until the PoE budget for the switch is reached. The total power available for PoE per switch is as follows:

Power dedicated to PoE


Number of ports that support PoE



RJ-45 ports


Combo ports (RJ-45 + SFP)


Console port

Cisco Standard mini USB Type-B / RJ45 console port

USB slot

USB Type-A slot on the front panel of the switch for easy file and image management


Reset button

Cabling type

Unshielded Twisted Pair (UTP) Category 5e or better for 1000BASE-T


System, Link/Act, PoE, Speed


256 MB


800 MHz ARM


512 MB

Packet buffer


Unit dimensions (W x H x D)

445 x 240 x 44 mm (17.5 x 9.45 x 1.73 in)

Unit weight

2.63 kg (5.80 lb)


100 to 240V 50 to 60 Hz, internal, universal: CBS250-16T-2G, CBS250-16P-2G, CBS250-24T-4G, CBS250-24PP-4G, CBS250-24P-4G, CBS250-24FP-4G, CBS250-48T-4G, CBS250-48PP-4G, CBS250-48P-4G, CBS250-24T-4X, CBS250-24P-4X, CBS250-24FP-4X, CBS250-48T-4X, CBS250-48P-4X100 to 240V 50 to 60 Hz, external: CBS250-8T-E-2G, CBS250-8PP-E-2G, CBS250-8P-E-2G, CBS250-8FP-E-2G


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

Operating temperature

23° to 122°F (-5° to 50°C)

Storage temperature

-13° to 158°F (-25° to 70°C)

Operating humidity

10% to 90%, relative, noncondensing

Package contents

Cisco Business 250 Series Smart Switch
Power cord (power adapter for 8-port SKUs)
Mounting kit
Quick Start Guide


Life Time


5 รายการ


ประเภท Switch
L2 Managed
ความเร็ว Port Lan
1Gbps (Gigabit)
จำนวน Port Lan
24 Port
SFP Port Gigabit
1 Port
ความคิดเห็น (0)


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