Dell Force10 E1200i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 192
Protocol Overview, Autonomous Systems (AS), Storing Last and Bad PDUs
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www.dell.com | support.dell.com • Implementing BGP with FTOS • Advertise IGP cost as MED for redistributed routes • Ignore Router-ID for some best-path calculations • 4-Byte AS Numbers • AS4 Number Representation • AS Number Migration • BGP4 Management Information Base (MIB) • Important Points to Remember • Configuration Information • Configuration Task List for BGP • MBGP Configuration • Storing Last and Bad PDUs • Capturing PDUs • PDU Counters • Sample Configurations BGP protocol standards are listed in the Appendix 64, Standards Compliance chapter. Protocol Overview Border Gateway Protocol (BGP) is an external gateway protocol that transmits interdomain routing information within and between Autonomous Systems (AS). Its primary function is to exchange network reachability information with other BGP systems. BGP generally operates with an Internal Gateway Protocol (IGP) such as OSPF or RIP, allowing you to communicate to external ASs smoothly. BGP adds reliability to network connections be having multiple paths from one router to another. Autonomous Systems (AS) BGP Autonomous Systems (ASs) are a collection of nodes under common administration, with common network routing policies. Each AS has a number, already assigned by an internet authority. You do not assign the BGP number. AS Numbers (ASNs) are important because the ASN uniquely identifies each network on the Internet. The IANA has reserved AS numbers 64512 through 65534 to be used for private purposes. The ASNs 0 and 65535 are reserved by the IANA and should not be used in a live environment. Autonomous Systems can be grouped into three categories, defined by their connections and operation. A multihomed AS is one that maintains connections to more than one other AS. This allows the AS to remain connected to the internet in the event of a complete failure of one of their connections. However, this type of AS does not allow traffic from one AS to pass through on its way to another AS. A simple example of this is seen in Figure 12-1. 192 | Border Gateway Protocol IPv4 (BGPv4)
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