By Randy Zhang
For those who wanna be a grasp in BGP know-how, this ebook could be a needs to. It explains in specific the BGP expertise and provides a sophisticated point.
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Additional info for BGP Design and Implementation
In other words, the forwarding decision is made by a process scheduled by the IOS scheduler and running as a peer to other processes on the router, such as routing protocols. Processes that normally run on the router are not interrupted to process-switch a packet. For IP packets, the forwarding process is IP Input. Figure 2-3 shows the main components of typical IP process switching. The following list outlines the process: 1 An IP packet received from the inbound interface is queued in the Synchronous Dynamic RAM (SDRAM) packet memory.
To have all routes redistributed individually, you must disable BGP auto-summary (otherwise, an automatic classful summary is created). A new default behavior was introduced in recent Cisco IOS software releases in which no autosummary is automatically enabled. The BGP network command operates differently from an IGP network command in Cisco IOS software. In most IGP conﬁgurations, the network command binds a local interface to a routing protocol and injects the interface address into the IGP. With BGP, the network command creates the route in the BGP table only if the route is already present in the IP routing table.
Book Page 26 Wednesday, November 12, 2003 5:19 PM 26 Chapter 2: Understanding BGP Building Blocks 6 MED is evaluated. The path with the lowest MED wins. By default, this comparison is done only if the ﬁrst (neighboring) AS is the same in the two paths; any confederation subautonomous systems are ignored. In other words, MEDs are compared only if the ﬁrst AS in the AS_SEQUENCE is the same for multiple paths. Any preceding AS_CONFED_SEQUENCE is ignored. If bgp always-compare-med is enabled, MEDs are compared for all paths, regardless of whether they come from the same AS.
BGP Design and Implementation by Randy Zhang