- Layer 2: Port grouping up to 32 groups, up to 8 ports per group with 16 candidate ports for each (dynamic) 802.3ad link aggregation.
- Layer 3: IPv4 routing Wirespeed routing of IPv4 packets up to 7K static routes and up to 256 IPv6 interfaces, Classless Interdomain Routing (CIDR) Support for CIDR.
- PoE: Power Dedicated to PoE: 740 W, Number of Ports That Support PoE: 48 (16 support 60W PoE).
- QoS (Quality of Service): Priority levels 8 hardware queues, Scheduling Strict priority and weighted round-robin (WRR) Queue assignment based on DSCP and class of service (802.1p/CoS).
Đặc tính kỹ thuật
Switching capacity and forwarding rate
Capacity in Millions of Packets per Second (mpps) (64-byte packets): 130.94
All switches are wire speed and nonblocking
Switching Capacity in Gigabits per Second (Gbps): 176
Total System Ports
48 GE + 4 10GE
Up link port
2 10GE copper/SFP+ combo + 2 SFP+
Frame sizes up to 9K bytes. The default MTU is 2K
Layer 2 Switching
Spanning Tree Protocol
Standard 802.1d Spanning Tree support Fast convergence using 802.1w (Rapid Spanning Tree [RSTP]), enabled by default 8 instances are supported Multiple Spanning Tree instances using 802.1s (MSTP)
Support for IEEE 802.3ad Link Aggregation Control Protocol (LACP): Up to 32 groups, Up to 8 ports per group with 16 candidate ports for each (dynamic) 802.3ad link aggregation
Support for up to 4096 VLANs simultaneously Port-based and 802.1Q tag-based VLANs MAC-based VLAN Management VLAN Private VLAN Edge (PVE), also known as protected ports, with multiple uplinks Guest VLAN Unauthenticated VLAN Dynamic VLAN assignment via RADIUS server along with 802.1x client authentication CPE 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
Multicast TV VLAN
Multicast TV VLAN allows the single multicast VLAN to be shared in the network while subscribers remain in separate VLANs (also known as MVR)
VLANs transparently cross a service provider network while isolating traffic among customers
Protocols for automatically propagating and configuring VLANs in a bridged domain
Unidirectional Link Detection (UDLD)
UDLD monitors physical connection to detect unidirectional links caused by incorrect wiring or cable/port faults to prevent forwarding loops and blackholing of traffic in switched networks
Dynamic Host Configuration Protocol (DHCP) Relay at Layer 2
Relay of DHCP traffic to DHCP server in different VLAN; works with DHCP Option 82
Internet Group Management Protocol (IGMP) versions 1, 2, and 3 snooping
IGMP limits bandwidth-intensive multicast traffic to only the requesters; supports 4K multicast groups (source-specific multicasting is also supported)
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
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
Wirespeed routing of IPv4 packets Up to 7K routes and up to 256 IP interfaces
Wirespeed IPv6 static routing
Up to 7K routes and up to 256 IPv6 interfaces
Layer 3 interface
Configuration of Layer 3 interface on physical port, LAG, VLAN interface, or loopback interface
Support for classless interdomain routing
Support for Routing Information Protocol version 2 for dynamic routing
Virtual Router Redundancy Protocol (VRRP) delivers improved availability in a Layer 3 network by providing redundancy of the default gateway servicing hosts on the network. VRRP versions 2 and 3 are supported. Up to 255 virtual routers are supported
Policy-based routing (PBR)
Flexible routing control to direct packets to different next hop based on IPv4 or IPv6 ACL
Switch functions as an IPv4 DHCP server serving IP addresses for multiple DHCP pools/scopes. Support for DHCP options
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 BOOTP/DHCP packets
SSH is a secure replacement for Telnet traffic. SCP also uses SSH. SSH versions 1 and 2 are supported.
Secure Sockets Layer (SSL) encrypts all HTTPS traffic, allowing secure access to the browser-based management GUI in the switch.
Web-based authentication provides network admission control through web browser to any host devices and operating systems.
STP BPDU Guard
A security mechanism to protect the networks from invalid configurations. A port enabled for Bridge Protocol Data Unit (BPDU) Guard is shut down if a BPDU message is received on that port. This avoids accidental topology loops.
STP Root Guard
This prevents edge devices not in the network administrator’s control from becoming Spanning Tree Protocol root nodes.
Filters out DHCP messages with unregistered IP addresses and/or from unexpected or untrusted interfaces. This prevents rogue devices from behaving as a DHCP server.
IP Source Guard (IPSG)
When IP Source Guard is enabled at a port, the switch filters out IP packets received from the port if the source IP addresses of the packets have not been statically configured or dynamically learned from DHCP snooping. This prevents IP address spoofing.
Dynamic ARP Inspection (DAI)
The switch discards ARP packets from a port if there are no static or dynamic IP/MAC bindings or if there is a discrepancy between the source or destination address in the ARP packet. This prevents man-in-the-middle attacks.
IP/MAC/Port Binding (IPMB)
The preceding features (DHCP Snooping, IP Source Guard, and Dynamic ARP Inspection) work together to prevent DoS attacks in the network, thereby increasing network availability.
Secure Core Technology (SCT)
Makes sure 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 plaintext or encrypted is provided according to the user-configured access level and the access method of the user.
Private VLAN provides security and isolation between switch ports, which helps ensure that users cannot snoop on other users’ traffic; supports multiple uplinks.
Ability to lock source MAC addresses to ports and limit the number of learned MAC addresses.
Supports RADIUS and TACACS authentication. Switch functions as a client.
The RADIUS accounting functions allow data to be sent at the start and end of services, indicating the amount of resources (such as time, packets, bytes, and so on) used during the session.
Broadcast, multicast, and unknown unicast.
Denial-of-service (DoS) attack prevention.
Multiple user privilege levels in CLI
Level 1, 7, and 15 privilege levels.
Support for up to 2K entries on SG550XG models. Support for up to 3K entries on all other models. Drop or rate limit based on source and destination MAC, VLAN ID or IP address, protocol, port, DSCP/IP precedence, TCP/User Datagram Protocol (UDP) source and destination ports, 802.1p priority, Ethernet type, Internet Control Message Protocol (ICMP) packets, Internet Group Management Protocol (IGMP) packets, TCP flag; ACL can be applied on both ingress and egress sides. Time-based ACLs supported.
Quality of Service
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 remarking ACLs, trusted QoS
Ingress policer; egress shaping and rate control; per VLAN, per port, and flow based
A TCP congestion avoidance algorithm is required to minimize and prevent global TCP loss synchronization.
Power over Ethernet (PoE)
The following switches support 802.3at PoE+, 802.3af PoE, and Cisco prestandard (legacy) PoE on any of the RJ45 network ports. 60W PoE is also supported on selected RJ-45 network ports Maximum power of 60W is delivered to any of the 60W PoE ports, and maximum power of 30W is delivered to any of the other RJ45 network ports, until the PoE budget for the switch is reached The total power available for PoE per switch is as follows