Vswitch performance indicators

Switch Type (rack-mounted, fixed configuration with/without expansion slot)

A rack-mounted switch is a slot-type switch that provides excellent scalability and supports different network types, such as Ethernet, fast Ethernet, Gigabit Ethernet, ATM, licensing ring, and FDDI, however, the price is relatively high. A fixed-configuration vswitch with expansion slot is a type of switch with a fixed number of ports and a small number of expansion slots. This type of switch can support other types of networks on the basis of a fixed-port network, the price is centered. Fixed configuration vswitches with no expansion slot support only one type of network, but the price is the cheapest.

Configuration

Rack Slots

The maximum number of modules that a rack-mounted switch can support.

Number of expansion slots

It refers to the maximum number of modules that can be inserted by fixed configuration switches with expansion slots.

Maximum number of stacks

The maximum number of switches that can be stacked in a stack unit. This parameter specifies the maximum port density available in a stack unit.

Min/max 10 M Ethernet port count

The minimum/maximum number of 10 M Ethernet ports supported by a vswitch.

Min/max m Ethernet port count

The minimum/maximum number of M Ethernet ports supported by a vswitch.

Minimum/maximum number of M Ethernet ports

The minimum/maximum number of Ethernet ports that a vswitch can connect.

Supported network types

Generally, fixed configuration switches with no expansion slot support only one type of network. Rack-mounted switches and fixed configuration switches with expansion slots support more than one type of network, for example, Ethernet, fast Ethernet, Gigabit Ethernet, ATM, licensing ring, and FDDI are supported. The more network types A vswitch supports, the higher the availability and scalability.

Maximum number of ATM ports

ATM is the asynchronous transmission mode. The maximum number of ATM ports is the maximum number of ATM ports supported by an ATM switch or a multi-service multi-function switch.

Maximum number of SONET ports

SONET, short for SynchronousOpticalNetwork, is a high-speed synchronization network specification with a maximum rate of 2.5 Gbps. The maximum number of SONET ports of a vswitch is the maximum number of downstream SONET interfaces of the vswitch.

Maximum number of FDDI ports

The maximum number of FDDI ports supported by an FDDI switch or a multi-service multi-function switch.

Backplane throughput (bps)

It is also called the backboard bandwidth, which is the maximum data volume that can be handled by the vswitch interface processor or interface card and data bus. The higher the bandwidth of the backboard of A vswitch, the stronger the ability to process data, but the design cost will also rise.

Buffer size

It is also called the packet buffer size. It is a queue structure that is used by the switch to coordinate the speed matching problem between different network devices. Burst data can be stored in the buffer until it is processed by a slow device. The buffer size should be moderate. A large buffer space will affect the packet forwarding speed in normal communication (because a large buffer space requires a little more addressing time) and increase the device cost. A small buffer space is prone to packet loss errors when congestion occurs. Therefore, adding an advanced buffer scheduling algorithm to an appropriate buffer space is a reasonable way to solve the buffer problem. Pay attention to the following points for the network trunk device:

Whether each port has an independent buffer space, and the working status of the buffer space does not affect the buffering status of other ports;

Whether the module or port is designed with independent input buffer, independent output buffer, or input/output buffer;

Whether there are a series of buffer management scheduling algorithms, such as RED, WRED, RR/FQ and WERR/WEFQ.

Max MAC address table size

Each port or device connecting to the LAN requires a MAC address, which is used by other devices to locate a specific port and update the route table and data structure. The MAC address is 6 bytes long and is allocated by IEEE. It is also called a physical address. The MAC address table size of a device indicates the maximum number of nodes that can be connected to the device.

Max Power Supply

Generally, the core equipment provides redundant power supply. After a power supply fails, other power supplies can continue to provide power, without affecting the normal operation of the equipment. When multiple power supplies are connected, pay attention to the use of multiple mains supply. In this way, when one line fails, other lines can still provide power.

Support protocols and standards

It generally refers to the networking specifications and equipment standards formulated by the International Organization for Standardization. You can classify the network models at Layer 1st, layer 2nd, and layer 3rd as follows:

Layer 1: EIA/TIA-232, EIA/TIA-449, X.21, EIA530/EIA530A interface definition.

Layer 3: 802.1d/SPT, 802.1Q, 802.1p, and 802.3x.

Layer 3: IP, IPX, RIP1/2, OSPF, BGP4, VRRP, and multicast protocol.

Route information protocol (RIP)

RIP is a distance vector protocol that uses the number of hops as the Metering Standard. RIP is widely used in the routing selection of global interconnection networks. It is an internal gateway protocol provided by the UNIX Berkeley standard distribution system. IPRIP is defined in RFC1058 and RFC1723.

RIP2

Is the latest enhanced version specification of RIP. It allows RIP packets to contain more information and provides a simple authentication mechanism. This is described in RFC1723.

Open Shortest Path First version 2nd (OSPFv2)

It is the second version of OSPF. OSPF is a connection status routing protocol. It is designed for IP addresses by the Internal Gateway Protocol workgroup of the interconnected network engineering task group (IETF, it is the next link State hierarchical routing algorithm of RIP in the Internet communication body. OSPF features include least-cost routing, multi-path, and load balancing. OSPF was developed from an earlier version of the IS-IS protocol and has two main features: first, the Protocol IS open, for example, RFC1247 has OSPF rules. Second, OSPF is built on the SPF algorithm. SPF is also called DIJKSTRA algorithm. It is named after the founder of this algorithm.

Border Gateway Protocol BGP

BGP is used to replace the EGP (ExteriorGatewayProtocol) Inter-Domain Routing Protocol. The accessibility between BGP and other BGP systems is defined by RFC1163. BGP4 is the fourth version of BGP. It supports CIDR and uses the Routing aggregation mechanism to reduce the size of the route table.

Classless Inter-Domain Routing (CIDR)

CIDR is a routing clustering technology supported by BGP4. CIDR allows multiple routers to form a route group to reduce the routing information of the core router load. Based on CIDR, several IP networks can be separated from groups as independent and large entities.

Internet Group Management Protocol IGMP

IGMP is short for InternetGroupManagementProtocol. An IP host is used to report its members to an adjacent multi-view router. A multi-view router sends an IGMP query packet to the connected local network. A host Member of a multi-object group sends an IGMP Report of the multi-object group to respond to a request. The MnS router is responsible for forwarding the MNS from one MnS group to all other networks with members in this group.

Distance Vector Multicast Routing Protocol DVMRP

DVMRP is a gateway protocol for interconnected networks. Basically, based on RIP, DVMRP can implement a typical IP multi-object mechanism for detection. DVMRP uses IGMP to exchange route data with neighboring points.

Open Shortest Path-first Multicast Routing Protocol MOSPF

Multi-object OSPF is used for the Inter-Domain multi-object routing protocol of the OSPF network. The extended form can be used for basic OSPF single-host protocol to support IP multi-destination routing.

Protocol-Independent Multicast Protocol PIM

PIM is the abbreviation of ProtocolIndependentMulticast. It is a multi-object transmission routing structure that can add IP addresses to the existing IP network. PIM is an independent route protocol for single-host transmission. It can be operated in two modes: intensive mode and loose mode. In PIM intensive mode, packet groups must forward data to all output interfaces until cropping and removal occurs. In dense mode, the receiver is dense, and it is assumed that the downlink network is ready to accept the data packets forwarded to it, and these data packets may be used. The cost of intensive mode is its inherent diffusion behavior. In the PIM loose mode, try to restrict data transmission, so that the number of routers that receive data in the network is minimized. In the loose mode, receivers are widely distributed, and it is assumed that the downlink network does not have to use sent data packets. The cost of using the loose mode is to explicitly combine the periodic refresh of packets and the requirements for RP (convergence point.

Resource Reservation Protocol (RSVP)

RSVP is short for ResourceReservationProtocol. This protocol supports resource retention across IP networks. Applications running on the IP terminal system can use the RSVP protocol to indicate the attributes of the data packet stream to be received by other nodes, such as bandwidth and maximum burst. RSVP depends on IPv6.

802.1p priority mark, multiple queues

The P standard is used to classify various network applications and information flows by priority. It ensures that key commercial applications and information flows with high time requirements are transmitted first, while taking care of low-priority applications and information flows to get the required services. This standard is essential for financial services, document processing, network management, integrated sound and data applications, video conferencing and Distributed Video Image teaching applications.

Routing

A process of finding the target host path is called routing. In a large network, a data packet passes through many intermediate paths before it reaches the target master, so the routing is complex. The implementation of a route in a vro relies on static protocols or dynamic routing protocols.

Layer-4 Switching

The so-called layer-3 switching is based on the exchange technology integrated with the routing technology, so that the switch can forward packets at line rate. A 3rd-layer switch is equivalent to a high-speed LAN router. Layer-3 switches can effectively control broadcast storms, Spanningtree loops, and IP address restrictions.

Supports multi-layer (Layer 4 to Layer 7) Switching

A multi-layer switch is a type of switch that filters and forwards data packets based on MAC addresses and network addresses. It is an intelligent subset of LAN switches. Multi-layer devices can understand the application of the transmitted data packets. Therefore, multi-layer switching provides application-level control, that is, supports Security filtering and provides specific QoS policies for application streams.

Support for multi-protocol routing

Multi-protocol routing is a hybrid multi-protocol (IP, IPv6, AppleTalk, and IPX) network environment, different heterogeneous networks can communicate with each other.

Supports protocols other than IP addresses

In addition to the IP protocol, AppleTalk, DECnet, IPX, NETBEUI, and other protocols are supported.

Support routing Cache

See "buffer size.

Maximum number of Route tables supported

Route tables are stored in routers or other Internet devices to track specific network targets. The maximum number of Route tables is the maximum number of routes stored in a route table.

VLAN

A virtual LAN configures a group of devices on the LAN to communicate on the same line, but they are in different network segments. A VLAN is an independent broadcast domain that effectively prevents broadcast storms. The VLAN is configured flexibly because it is based on logical connections rather than physical connections. Now, whether a vswitch supports VLAN is an important parameter for measuring the performance of a vswitch. In VLAN Division