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bgp的问题
iBGP describes the peering between BGP neighbors in the same autonomous system(AS). You\r\nuse iBGP in transit autonomous systems. Transit autonomous systems forward traffic from one\r\nAS to another AS. If you do not use iBGP in transit autonomous systems, the eBGP learned\r\nroutes are redistributed into an IGP and then redistributed into the BGP process in another\r\neBGP router. iBGP provides a better way to control the routes for the transit AS. With iBGP,\r\nthe external route information (attributes) are forwarded. iBGP is preferred over redistribution\r\nwith an IGP because the IGP does not understand AS paths and other BGP attributes.\r\nAnother use for iBGP is in large corporations where the IGP networks are too large to be supported\r\nby an IGP, such as Open Shortest Path First (OSPF). Three independent IGPs are in\r\nFigure 9-2: one for the Americas; one for Asia and Australia; and one for Europe, the Middle\r\nEast, and Africa. Routes are redistributed into an iBGP core. |
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