2024年9月27日 · Administrative distance is the first criterion that a router uses to determine which routing protocol to use if two protocols provide route information for the same destination. …

Each routing protocol has its own Administrative Distance (AD), which is a value representing the trustworthiness of the specific routing protocol. If a router learns a destination route from two or more routing protocols, it selects the route from the …

2025年2月13日 · Administrative Distance (AD Value) is a fundamental concept in networking that influences how routers select the best route among multiple options. Understanding default AD values and how to modify them allows network engineers to …

The Junos OS routing protocol process assigns a default preference value (also known as an administrative distance) to each route that the routing table receives. The default value depends on the source of the route. The preference value is a value from 0 through 4,294,967,295 (2 32 – 1), with a lower value indicating a more preferred route.

2013年5月22日 · Is there any way to change the AD for an inbound eBGP routes to match with route-map instead of ACL? I know I can do that with ACL as follows and it works, but it is not scalable and if there is a way I can match AS Path or Community via route-map and then change the AD for those that matches, that will be ideal.

Administrative distance (AD) or route preference[1] is a number of arbitrary unit assigned to dynamic routes, static routes and directly-connected routes.

Depends. If it is a static route, the AD-value comes from the "ip route" (or "ipv6 route" ) statement in the configuration (with no AD specified, it will be AD of 1). If it is learned by a routing protocol, the AD value comes from the routing protocol (EIGRP by default 90, ospf by default 110, ...). Expand Post LikeLikedUnlike Reply Log In to ...

2021年10月20日 · Administrative Distance (AD) is used to rate the trustworthiness of routing information received from the neighbor router. The route with the least AD will be selected as the best route to reach the destination remote network and that route will be placed in the routing table. It defines how reliable a routing protocol is.

2024年4月29日 · BGP设计是用来处理AS之间的路由协议重点处理AS之间的路由，AS之内的路由不作为重点，所以内部AD值是200，外部是20. BGP的使用单位是一个路由器，所以每个路由器只能使用一个BGP的进程。 由于BGP管理的路由信息非常庞大，不能够使用周期更新，只能触发更新，并且BGP会认为一条路由时间越久越稳定，在这种情况下BGP必然不会使用复杂的算法来处理BGP收到的路由信息，又由于每个AS情况不一致，管理范围有限，必然需要丰富的管理参 …

To modify the default BGP preference value, include the preference statement, specifying a value from 0 through 4,294,967,295 (2 32 – 1). Another way to achieve multivendor compatibility is to include the advertise-inactive statement in the EBGP configuration.