By Randy Zhang
Examine useful directions for designing and deploying a scalable BGP routing structure updated insurance of BGP good points like functionality tuning, multiprotocol BGP, MPLS VPN, and multicast BGP In-depth assurance of complicated BGP subject matters to assist layout a posh BGP routing structure functional layout counsel which were confirmed within the box large configuration examples and case reviews BGP layout and Implementation makes a speciality of real-world difficulties and offers not just layout recommendations, but in addition the historical past on why they're acceptable and a pragmatic evaluate of ways they follow right into a top-down layout. The BGP protocol is getting used in either merchant and company networks. The layout targets of those teams are diversified, resulting in diversified architectures getting used in each one surroundings. The name breaks out the separate targets, and ensuing ideas for every workforce to help the reader in additional realizing varied resolution innovations. This publication starts off through settling on key beneficial properties and performance in BGP. It then delves into the subjects of functionality tuning, routing coverage improvement, and architectural scalability. It progresses via reading the demanding situations for either the merchant and company consumers, and offers useful guidance and a layout framework for every. BGP layout and Implementation winds up by means of heavily taking a look at the more moderen extensions to BGP via Multi-Protocol BGP for MPLS-VPN, IP Multicast, IPv6, and CLNS. every one bankruptcy is usually prepared into the subsequent sections: advent, layout and Implementation instructions, Case reports, and precis. 1587051095101412003
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Extra info for BGP Design and Implementation
Two types of communities exist: • Well-known communities—When receiving prefixes with these communities, peers take actions automatically based on the predefined meanings of the communities. No additional configurations are needed. In RFC 1997, the well-known communities fall in the range of reserved values, which are from 0xFFFF0000 through 0xFFFFFFFF. • Private communities—Communities can be defined by the administrators and must be coordinated between peers of the different autonomous systems.
In fact, Cisco IOS software does not even check for AS_PATH loops if updates come from an iBGP peer. Without the additional AS_PATH information, a routing information loop can form within the iBGP domain.
If router R1 in AS 65000 advertises a prefix to R3 in AS 65001, R1 prepends 65000 to the AS_PATH list for the prefix when it sends the prefix to R3. If that same prefix is received by AS 65000 again, a border BGP speaker rejects the prefix, because it detects a loop in the AS_PATH attribute. Figure 2-2 Prefix Propagation in a Multi-AS Topology Continuing with Figure 2-2, assume that R3 needs to propagate the prefix to R7 in AS 65002. There are a couple of options to achieve that. One option is to have R3 redistribute all the BGP prefixes into the IGP, which advertises them to R4, R5, and R6.