iBGP examples

Hello
Border Gateway Protocol (BGP) is a dynamic routing protocol used between Autonomous Systems (ASs). BGP is widely used by Internet Service Providers (ISPs).

As three earlier-released versions of BGP, BGP-1, BGP-2, and BGP-3 are used to exchange reachable inter-AS routes, establish inter-AS paths, avoid routing loops, and apply routing policies between ASs.

Currently, BGP-4 is used.

You can see
https://support.huawei.com/hedex/hdx.do?docid=DOC1100339267&path=PBI1-7275726/PBI1-21782273/PBI1-7275849/PBI1-7276518/PBI1-15837

Hello albertsilva,
Well, in my opinion, there isn't a scenario which only the BGP is suitable.
Commonly, except the route switching between the different ISPs or areas, the BGP is selected due to the most convenient and powerful route controll. BGP provides varity of route controll methods.
iBGP commonly used in a single AS, and it's not necessary that allocate per router an AS, besides, AS number is similar to the IPv4 address, there is a upper limit, a waste of AS number is not a smart choice.

To configure the BGP, kindly refer to https://support.huawei.com/hedex/hdx.do?docid=EDOC1000163385&id=dc_cfg_bgp_0001&lang=en

Hello,

I think the sole purpose of internal routing, for example, for VPN – a very popular application, based on BGP in the corporate environment or maybe as an option of organizing the L3 isolated areas within the infrastructure that has already been built.

Essentially iBGP is the same BGP, but inside the AS. It is even configured in a similar way. Lets show you two main applications:

• Redundancy: When there are several connections to providers and one ties to avoid linking everything to one edge router (the so-called border), several routers are put in place and IBGP is established between them, so that they always have up-to-date information about all routes.

• Connecting customers through BGP: If the goal is to connect client by BGP, and there are several routers, this cannot be accomplished without IBGP.

I will leave you a link where you will find all the documentation to configure GBP correctly.

https://support.huawei.com/hedex/hdx.do?docid=EDOC1000163385&id=dc_cfg_bgp_0001&lang=en

I hope I've helped you, please let me know if you have any questions.