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BGP Route-Reflectors

Latest reply: Mar 25, 2019 22:45:05 911 2 0 0 0

Recall that BGP requires all iBGP peers to be fully meshed. RouteReflectors allow us to bypass this restriction. Fewer neighbor connections will result in less bandwidth and CPU usage.

Route-reflector clients form neighbor adjacencies with the route-reflector server. BGP updates will flow from the server to the clients, without the clients having to interact with each other.


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Consider the above example. In AS 100, there are three BGP speakers. Normally, these iBGP peers must be fully-meshed. For example, RouterB would need a neighbor statement for both RouterA and RouterD.


As an alternative, RouterA can be configured as a route-reflector server. Both RouterB and RouterD would
only need to peer with RouterA.


All route-reflector specific configuration takes place on the route reflector server.


Configuration


[Huawei]bgp 100

[Huawei-bgp]peer 10.1.1.2 as-number 100 

[Huawei-bgp]peer 10.2.1.2 as-number 100 

[Huawei-bgp]ipv4-family unicast

[Huawei-bgp]undo synchronization == we didn't need to execute this command as synchronization is disbled by default.

[Huawei-bgp]peer 10.1.1.2 enable

[Huawei-bgp]peer 10.1.1.2 reflect-client

[Huawei-bgp]peer 10.2.1.2 enable

[Huawei-bgp]peer 10.2.1.2 reflect-client


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  • convention:

sim_157
Created Mar 18, 2019 01:18:47

why the synchronization is disabled by default?
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  • convention:

Diaa_Mohamed
Created Mar 25, 2019 22:45:05

Posted by sim_157 at 2019-03-17 19:18 why the synchronization is disabled by default?
The BGP synchronization rule states that if an AS provides transit service to another AS, BGP should not advertise a route until all of the routers within the AS have learned about the route via an IGP.
Synchronization avoids black hole scenario but leads us to run BGP in all router and establishment full mesh with all AS routers so it disables by default as we have a common solution (route reflector) or another complicated solution ( BGP confederation )
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  • x
  • convention:

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