It offers Power over Ethernet Plus, true stacking, advanced security, quality of service, energy-saving technology EEE , IPv6, and network features that deliver the reliability and performance needed by demanding environments. The switch is easy to configure and manage with a choice of management tools. The Cisco SGP provides the ideal technology foundation at a price you can afford, and in a solution designed to grow with your business. These stackable managed switches, built for demanding environments, deliver a powerful networking foundation for today and tomorrow. Simplified Network Setup and Operations: Intuitive browser-based tools, auto-configuration and discovery, and true stacking make theses switches easy to use and manage and simplify day-to-day network operations. They feature: Simple-to-use graphical interfaces reduce the time required to deploy, troubleshoot, and manage the network and allow you to support sophisticated capabilities without increasing IT head count.
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These switches are ideal for simple deployments requiring basic connectivity. The series are fully-managed switches and add Layer 3 functionality, meaning they can route traffic at switch speeds. The series switches add stacking functionality. Stacking means multiple switches can be connected together and configured as a single switch.
Multiple series switches can be combined into a single stack with a maximum of ports. All the Cisco small business switch model numbers have an S as the first character. Following the SF or SG is , , or to indicate series. Following the series number is a dash and the number of ports. An exception to the model naming convention is the SGX switches which have 4 10Gbps ports in addition to the number of ports indicated in their model number. Finally, a P at the end of the model number indicates the switch supports PoE.
Inside Physically, the SGP measures It comes with brackets for rack mounting, and has a pair of rpm non-controllable fans for cooling. A second upper-level board holds circuitry that provides the Figure 1 provides a look inside the SG with the PoE board in place.
Figure 3: SGP front view The back of the switch, shown in Figure 4, has a console port, exhaust vents for the two fans and the power connector for the internal power supply. But the web admin GUI makes the small business switches easier to configure. The downside to the web GUI is there is a lag between some of the configuration screens. So I got to see the "Processing Data" graphic quite often when changing between admin screens. Figure 5: Waiting for the admin page to change If you want to configure the SGP from the command line, a serial cable is included to connect to the console port.
The SG can also be configured from the command line via a telnet or ssh if enabled. There are 13 configuration menus listed on the left side of the web page, with numerous submenu options in each. A look at the screen presented upon login is shown in Figure 6 below. I think you get a good idea of what you can do with a device by looking at a list of its configuration options. Note, to fit all the sub-menus into a single table, I abbreviated some of the options. Table 2: Menu tree A nuance in configuring this switch is that you must save your configs for them to persist through a reboot or power loss.
The manual outlines the features, but could use a few examples to better explain the configuration options. VLANs are created by giving them a number and optionally a name. Access ports are members of a single VLAN with no tagging applied. General ports can be members of one or more untagged and tagged VLANs. There is a handy copy function on the SG which allows you to configure VLAN settings on one port and copy it to multiple other ports.
Port 1 is my trunk to the GST. To pass traffic between subnets, routing needs to occur, either with a router or Layer 3 switch.
Layer 3 switches are desirable as they can pass traffic between subnets much faster than routers. With Layer 3 switching enabled, virtual Layer 3 interfaces can be created per VLAN and physical interfaces single ports and LAGs can be converted from a switched interface to a Layer 3 interface.
By default, the switch runs in Layer 2 mode. If you choose to use Layer 3 mode, enable this option first. When you covert the SGP to Layer 3 mode, it reboots and erases itself, regardless of whether you did a config save, wiping out all your previous configurations. I learned this the hard way!
Static routes can also be added, enabling routing between an external router, such as adding a default route to the router used to connect to the Internet. However, with the correct static routes on the SGP and my router, as well as the appropriate configuration in my end devices, I found the SGP routed traffic at Layer 3 as expected. The SG also supports IPv6 addressing and switching.
STP prevents network loops from being formed by automatically taking down one or more interfaces suspected to be part of a loop. Without RSTP, both trunks would come up on both sides, resulting in a switching loop. Enabling jumbo frames on the switch is a check box and reboot, as shown in Figure Once enabled, I was able to pass up to 4k jumbo frames over the SG, which is my end device limit.
LAG trunking increases bandwidth between devices and improves redundancy as the LAG connection will stay up and carry traffic as long as one of its interfaces is up. As shown in Figure 11, my LAG trunk came up without issue. There are four queues and two different methods for queue management, as well as options for bandwidth limiting via ingress and egress rate controls. Traffic prioritization is handled via four queues, with traffic assigned to each queue based on QoS value.
If there is congestion on the switch, traffic will get delivered based on queue priority. Strict priority will ensure that traffic in the high priority queue gets through first, but can result in dropping too much traffic in the low priority queue.
WRR provides a middle ground, allowing prioritization of delay sensitive traffic, yet permitting all traffic access to network resources. Basic bandwidth utilization can be managed by port with Ingress and Egress rate limits.
I ran a simple test by configuring a port on the SG with Ingress and Egress rate limits of Kbps. See port GE13 in Figure Using iperf, I measured Kbps in each direction with the bandwidth limit applied, closely matching the Kbps limit set.
Security The SGP has extensive security controls. I then plugged the device with the specified MAC to port 7 on the SG, which resulted in the switch disabling port 7 as expected. PoE is used frequently with VoIP devices, providing power over the network cable and eliminating the need for a separate power cable and outlet for the PoE end device.
The SGP can provide a maximum of W of power on ports As a simple test, I plugged in a Grandstream PoE device to a port, saw it get power and boot immediately. You can see that port 7 is drawing mW in Figure Port mirroring can be applied by port or by VLAN, enabling packet captures and advanced troubleshooting of network devices.
More complex features on the SG include an array of options to manage Multicast traffic, as well as detailed support for SNMP communication with network monitoring systems. Note, the Cisco 24 port series switches may have up to 28 ports counting combo and stacking ports. A combo port is actually two physical ports, one copper and one fiber, with the fiber port supporting a fiber connector.
If both the copper and fiber port in the pair are connected, the fiber port will be active. A stacking port is used for connecting, or stacking, multiple switches together. Switching capacity, measured in Gigabits per second Gbps , is the size of the data bus on the switch, which is a physical component rating.
Forwarding capacity, measured in millions of byte packets per second mpps , is the speed of the packet processor, which is a throughput rating. Table 3: Cisco switch comparison As you can see in Table 3, as the model numbers go up, so does switching and forwarding capacity. MAC table capacity and the number of supported VLANs increase from the to the series, but are the same in the and series.
Obviously, price goes up as you add capacity, speed, and functionality. I recommend starting by evaluating the number of ports and port speed required. If you need a simple "dumb" switch, the series fits that bill. If you need VLANs, port mirroring or other simple managed switch features, you need at least the series. If you need your VLANs to live on different subnets, you need the Layer 3 functionality of the series.
If you need routing on the switch, you need the Layer 3 functionality of the series.
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