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The private AS number ranges from to , where private AS numbers are available. If the IP fabric network has more than switches, the public AS numbers not recommended in data centers or 4-byte private AS numbers must be used. CE series switches support 4-byte private AS numbers in a range from to or from All rights reserved. Huawei Enterprise Support Community. User Guide New to the community? Find out how to get started! Stay connected! Choose the types of newsletters you want to receive! Like 1 Dislike 0 Favorite 0 Share Report.
Featured Answers. Best answer. NikoleT Created May 2, This method of peering using a loopback interface is useful since it will not bring down the BGP session when there are multiple paths between the BGP peers, which would otherwise result in tearing down the BGP session if the physical interface used for establishing the session goes down.
In addition to that, it also allows the routers running BGP with multiple links between them to load balance over the available paths. Note: You can use these configurations for establishing neighbor relationship. This document is not restricted to specific software and hardware versions. For more information on document conventions, refer to Cisco Technical Tips Conventions.
IGP usually is OSPF or ISIS which are link-state based, this gives us all the information of the network, everyone knows network from everyone's point-of-view, which allows for very interesting convergence options and traffic engineering options. BGP is essentially distance-vector, it knows very limited view on the network at whole. BGP handles very well filtering and modifying routing information.
So reason why we have both, is because inside one specific network, we have sufficiently low-complexity to handle it with link-state protocol, which allows us to gain all the advantages of high degree of knowledge of network.
But as it does not scale to Internet size, we need some other network to connect these many link-state islands. You could inside your own network carry all prefixes including customer in your IGP, but it will negatively impact IGP performance, while all the convergence and TE advantages can be gained by just carrying loopback addresses of core routers. As a result there is no need to redistribute routes from one routing protocol to another.
EBGP exchanges internet i. Why not IGP does the same? As IGP is quite chatty i. Sign up to join this community. The best answers are voted up and rise to the top.
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