Application Guide: in-depth analysis of vro Interface Application

Vro interfaces play a very important role in route configuration. Here we mainly introduce the practical application of vro interfaces. port throughput refers to the port packet forwarding capability, which usually uses pps: A packet is measured per second. It is the packet forwarding capability of a router interface on a port. Generally, two interfaces with the same rate are used for testing. However, the test interface may be related to the interface location and relationship. For example, the throughput tested between ports on the same plug-in card may be different from the throughput value between ports on different plug-in cards.

Route table capability

A Router usually depends on the route table created and maintained to determine how to forward data. The route table capability refers to the maximum number of route table entries in a route table. As the number of Route tables that run the BGP protocol on the Internet is usually 100,000, this project is also an important embodiment of the router interface capability.

Backplane capability

The backplane capability is the internal implementation of the router. The backplane capability can be reflected in the router throughput: The backplane capability is generally greater than the value calculated based on the throughput and test package location. However, the backplane capability can only be reflected in the design and cannot be tested.

QoS classification method

The information on which the router interface can differentiate QoS. The simplest QoS classification can be based on ports. Similarly, the router interface can distinguish packet priority based on the link layer priority 802.1Q), the upper layer content TOS field, source address, Destination Address, source port, destination port, and other information.

Supported group speech

In enterprises, the voice bearer capability of vro groups is very important. Between the remote office and the headquarters, vro interfaces Supporting Group speech can integrate telephone communication and data communication, effectively saving long-distance calls. In the current technical environment, group speech can be divided into three types: Using IP to carry group speech, using ATM to carry speech, and using frame relay to carry speech. When using ATM to carry voice, there are two types: AAL1 and AAL. AAL1 is circuit simulation. The technology is very mature, but the relative cost is high. The AAL technology is advanced, but the current ATM interface is usually not supported. Frame Relay speech is also relatively mature and relatively cost-effective. Currently, IP-bearer speech is popular. The above technology has the lowest cost, but it is difficult to ensure the QoS of the current IP network and ensure the quality of calls.

Speech compression capability

Voice compression is one of the key to saving costs for IP phones. G.723 and G.729 are usually used. G.723 is recommended in the ITU-T G.723.1 (1996), which is specified in the 5.3 and 6.3Kbps dual-rate voice encoder for multimedia communication transmission. Relatively high compression, large compression latency. G.729 is specified in the ITU-T recommendation G.729 (1996), 8 kbps co-structured representative digital incentive Linear Prediction (CS-ACELP) Speech Encoding. Low compression ratio and good call quality.

Signaling support

Vroe1 E1 port may support multiple types of signaling: ISUP, TUP, China 1 signaling, and dss1. Vro interfaces supporting ISUP, TUP, or DSS1 signaling can effectively reduce the connection time. Generally, carrier-level IP phone network devices require support for signaling 7. However, as a low-end router interface, only DSS1 and China 1 signaling are supported.