Layer 2 Switching |
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Spanning Tree Protocol (STP) |
Standard 802.1d spanning tree support Fast convergence using 802.1w (Rapid Spanning |
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Tree Protocol [RSTP]), enabled by default Multiple spanning tree instances using 802.1s |
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(MSTP); 8 instances are supported |
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Port grouping/link aggregation |
Support for IEEE 802.3ad Link Aggregation Control Protocol (LACP) |
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● Up to 4 groups |
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● Up to 8 ports per group with 16 candidate ports for each (dynamic) 802.3ad LAG |
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VLAN |
Support for up to 256 active VLANs simultaneously Port-based and 802.1Q tag-based VLANs |
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Management VLAN |
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Voice VLAN |
Voice traffic is automatically assigned to a voice-specific VLAN and treated with appropriate |
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levels of QoS. Auto voice capabilities deliver networkwide zero-touch deployment of voice |
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endpoints and call control devices. |
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IGMP (versions 1, 2, and 3) snooping |
Internet Group Management Protocol (IGMP) limits bandwidth-intensive multicast traffic to |
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only the requesters; supports 4K multicast groups (source-specific multicasting is also supported). |
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HOL blocking |
Head-of-line (HOL) blocking |
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SSL |
Secure Sockets Layer (SSL) encrypts all HTTPS traffic, allowing secure access to the browser- |
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based management GUI in the switch. |
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IEEE 802.1X (authenticator role) |
RADIUS authentication, MD5 hash, single/multiple host mode, and single/multiple sessions |
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Secure Sensitive Data (SSD) |
A mechanism to manage sensitive data (such as passwords, keys, and so on) securely on the |
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switch, populating this data to other devices, and secure autoconfig. Access to view the |
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sensitive data as plaintext or encrypted is provided according to the user-configured access |
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level and the access method of the user |
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Port security |
Ability to lock source MAC addresses to ports and limit the number of learned MAC addresses. |
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RADIUS |
Supports RADIUS authentication for management access. Switch functions as a client. |
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Storm control |
Broadcast, multicast, and unknown unicast. |
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DoS prevention |
Denial-of-service (DoS) attack prevention. |
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Priority levels |
4 hardware queues |
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Scheduling |
Strict priority and weighted round-robin (WRR) |
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Class of service |
Port based; 802.1p VLAN priority based; IPv4/v6 IP precedence/ToS/DSCP based; DiffServ; |
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trusted QoS Queue assignment based on differentiated services code point (DSCP) and class |
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of service (802.1p/CoS |
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Rate limiting |
Ingress policer, per VLAN, per port |
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USB slot |
USB Type-A slot on the front panel of the switch for easy file and image management |
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Buttons |
Reset button |
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Cabling type |
Unshielded twisted pair (UTP) Category 5 or better for 10BASE-T/100BASE-TX; UTP Category 5e |
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or better for 1000BASE-T |
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LEDs |
System, Link/Act, PoE, Speed |
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Flash |
256 MB |
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CPU |
800 MHz ARM |
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CPU memory |
512 MB |
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Power |
100–240V 50–60 Hz, internal, universal – SF250-48, SF250-48HP, SG250-26, SG250-26HP, SG250-26P |
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100–240V 50–60 Hz, external – SG250-10P |
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Certification |
UL (UL 60950), CSA (CSA 22.2), CE mark, FCC Part 15 (CFR 47) Class A |
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Operating temperature |
SF250-48, SF250-48HP, SG250-10P, SG250-26, SG250-26HP, SG250-26P 32° to 122°F (0° to 50°C) |
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Storage temperature |
-4° to 158°F (-20° to 70°C) |
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Operating humidity |
10% to 90%, relative, noncondensing |
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Storage humidity |
10% to 90%, relative, noncondensing |