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In this short lesson I’ll explain to you what administrative distance is and how it works. Let me show you an example: Imagine we have a network that is running two routing protocols at the same time, OSPF and EIGRP. Administrative Distance. アドミニストレーティブディスタンス（ AD ）とは. 1台のルータには、スタティックルートとダイナミックルートを混在させられます。.

Ibgp administrative distance

1. eBGP. 20. EIGRP. 90. OSPF.

Let me show you an example: Imagine we have a network that is running two routing protocols at the same time, OSPF and EIGRP.

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device (config-bgp-router)# distance 200 200 200. Syntax: [no] distance external-distance internal-distance local-distance. The external-distance sets the EBGP distance and can be a value from 1 through 255.

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iBGP Administrative Distance: iBGP routes have administrative distance of 200. iBGP Toplogy: iBGP requires full mesh or else either of route reflectors or BGP confederation. 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.

下図R1のルーティングテーブルで「172.16.4.0/24」の. 宛先ルートをスタティックルートとして保持するだけではなく、RIPによるダイナミック the administrative distance for eigrp 5 the administrative distance for ebgp 20 the administrative distance for ibgp 200 1. EBGP is peering between two different AS, whereas IBGP is between same AS (Autonomous System).
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This presents problems because the metrics, attributes, and administrative distances of each routing protocol are different. BGP maintains a lot of information which OSPF doesn't. If you get eBGP routes on Router 1, redistribute the routes into OSPF, and send them to Router 2 (also running BGP), then redistribute them back into BGP, you have lost all the BGP attributes which Router 1 had received. Modification de la distance administrative par défaut du routeur BGP. "distance bgp" permet de modifier les 3 valeurs de distance administrative par défaut : eBGP. iBGP.

Administrative distance is one of those routing concepts that most CCNA students have difficulty with to understand. In this short lesson I’ll explain to you what administrative distance is and how it works.
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We can also guess from the weight value that this is iBGP peer. Next step is to verify the routing table for iBGP with “show ip route bgp” command.

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The administrative distances used for the IP routing protocols are: Connected— 0.

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iBGP. local routes.

R2#conf t. R2 If the router sends announcement to IBGP neighbor, the address of the Next-Hop is not changed. It is unclear why. It differs from the usual understanding of the DV (Distance Vector) routing protocol. Here is the same announcement when sending from R1 to R2: The fact is that here the concept of Next-Hop differs from one used in the IGP. Specifies the administrative distance for eBGP routes. Default: 20.