BGP Route display details

BGP routing details: BGP routing has encountered many problems recently. BGP routing details recently indicate that the relevant patches have been released and the security vulnerabilities have been well solved.

How do I display all BGP routes in the database?

To display all BGP routes in the database, enter the following command line in the EXEC command line:
◆ Show ip bgp paths
◆ The output of this command may be:
◆ Address Hash Refcount MetricPath
◆ 0x2 9 7 A 9 C 0 2 0 I

What is horizontal segmentation?

Horizontal segmentation is a technology that avoids the appearance of routing rings and accelerates route aggregation. Because the router may receive the route information sent by itself, and this information is useless, the horizontal segmentation technology does not reverse notice any route update information received from the terminal, instead, only route entries that are not cleared due to infinite counts are advertised.

How is a routing ring generated?

Because of the convergence time of BGP routes, the new or changed routes in the route table cannot be stable in the whole network quickly, resulting in inconsistent routes. Therefore, a routing ring is generated.

What is a metric value? BGP Route

The measurement value indicates the distance. They are used to determine the optimal route when looking for a route. When a route table is generated by each routing algorithm, a numerical metric value is generated for each route through the network. The minimum value indicates the optimal path. The Calculation of measurement values can only consider one feature of the path, but more complex measurement values are generated by combining multiple features of the path. Some common metric values include:
◆ Hop count: the number of router output ports to pass through.
◆ Ticks: the latency of the data link is about 1/18 per second ).
◆ Cost: it can be an arbitrary value, which is calculated based on bandwidth, fees, or other network manager-defined calculation methods.
◆ Bandwidth: the capacity of the data link.
◆ Latency: the length of time the message is sent from the source to the destination.
◆ Load: the size of the used network resources or links.
◆ Reliability: Ratio of error bits on the network link.
◆ Maximum transmission unit (MTU): The maximum message length allowed by all links in a path is measured in bytes ).

What type of Route metric value does IGRP use? What is the composition of this metric value?

IGRP uses multiple route metric values. It includes the following parts: BGP routing
◆ Bandwidth: The minimum bandwidth value between the source and destination.
◆ Latency: The interface latency accumulated in the path.
◆ Reliability: The worst possible reliability between the source and target is based on the link persistence status.
◆ Load: the load of the link between the source and target in the worst case, expressed in bits per second.
◆ MTU: The minimum m t u value in the path.