Explore the Management Distance and measurement issues in vro parameter settings

It is very helpful to know about vro parameter settings. Here we mainly introduce the parameter settings for management spacing, including the measurement of vro. When talking about the routing protocol and router parameter settings, the administrative distance (administrative distance) and measurement (Metrics) are two important parameters.

What do these two sets of parameters really mean? David Davis will introduce the two sets of parameters and explain the reasons why Cisco routers need to understand the importance of management parameters. When it comes to which channel the routing protocol and router parameters are used, Management Distance and measurement are two important parameters. Full familiarity with these two sets of parameters plays an important role in understanding network performance, reliability, and loop selection.

Management Interval

Management spacing (AD) is used to determine which channel to select when the router faces two channels of the same source. That is, if the router receives information from different sources but with the same content, which channel the router trusts. A better way is to make the best effort to select local information, and the global information is somewhat repetitive, so local information is more trustworthy. If your router only has one routing protocol and one WAN loop, or if you only use static routing, the management distance will not affect you. However, this does not mean that you do not need to understand the role of management spacing. But if you have a complicated network system, such as two WAN circuits, or you use two routing protocols, even if one of them is a static route ), you should understand the importance of management spacing.

Routing resources are not only some routing protocols such as RIP, OSPF, or BGP, but also some resources connected to the router parameter settings, such as the router interface) and Static Routing you use as the Management Server ). Vro parameter settings select the trusted Resource Based on the Management interval. The smaller the management interval, the more trustworthy its routing resources are. To facilitate this decision, the router has installed a pre-program schedule table displayed in all possible resources and the default Management gap. Table A provides an example of this table. Although the distance command in vro parameter setting mode is used to change the manager's default Management spacing, this is usually an undesirable method. For example, if the router receives a route from OSPF and a route from RIP, it selects an OSPF route. Because the OSPF management interval is 110, and the RIP management interval is 120.

Here is another example: for example, if your vro receives a route from Internal, its management interval is 90, But you accidentally input a static route to an IP address, the Gap Management address of this IP address is 1. Then, the vroeigrp parameter settings use Static Routing instead of using the OSPF route. The last point is to emphasize that the management interval is the focus of the CCNA examination. If you are preparing to take this test, you must know the Management Distance of the general routing protocol.

Measure

The routing protocol uses metrics to determine which route table to be placed when two valid routes can be sent to the same target file. The router parameter setting puts the route table into the route table with the smallest measurement, because it considers this route as the nearest and therefore the best. In contrast to the management distance, the measurement has only one routing protocol. They cannot process routes in multiple resource pools.

Different routing protocols have different algorithms for metrics. The RIP algorithm is based on the number of hops, and OSPF is based on the bandwidth. The OSPF algorithm is determined by the bandwidth, delay time, load, and reliability. David Davis has been engaged in IT for 12 years and has obtained a series of certificates including CCIE, MCSE + I, CISSP, CCNA, CCDA and CCNP. Currently, he serves as a system/network administrator at a private retail company and serves as a part-time consultant for network systems.