Interdomain Routing
An advanced guide to configuring and deploying Border Gateway Protocol (BGP) across autonomous systems and multi-layered networks
| Border Gateway Protocol (BGP) Interdomain Routing An advanced guide to configuring and deploying Border Gateway Protocol (BGP) across autonomous systems and multi-layered networks |
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Course benefits The continuing proliferation of traffic across today’s networks demands the deployment of an efficient and robust means of data transmission. Border Gateway Protocol (BGP) addresses this need. BGP is increasingly deployed across many commercial networks to facilitate routing and information exchange. This in depth and up-to-date training course will give you a thorough grounding in this complex routing protocol. Following the completion of this course you will be able to install, configure and maintain BGP with confidence thus ensuring the effective exchange of data across reliable and robust networks.
Through comprehensive lecture sessions, exercises and lab projects, delegates gain hands-on experience configuring operational Cisco routers. On completing this course, delegates will be able to:
Who should attend? This course will be of value to all professionals who are responsible for configuring, administering and troubleshooting a BGP network. It will also provide the advanced skills necessary for the future implementation of BGP or the migration to BGP across an autonomous system. Pre-requisites Attendance on course 362: Interconnecting Cisco Internetwork Devices and course 366: Building Scalable Cisco Internetworks. |
Course 367: Content The fundamentals of BGP sessions BGP in a nutshell Attributes of BGP and interdomain routing between autonomous systems Next hop, local preferences, multi-exit discriminator (MED), origin and aggregate AS Path attributes, notification message packets and error codes Implementing BGP - when to use it BGP on transit systems BGP on multi homed and dual homed networks BGP Packet Formats and fields; components and functions Header formats and message formats Open and update message fields and packets Authentication data and variable length field BGP routing procedures with TCP/IP Peer routers and port 179 Exchanging network reachability information Observing changes in routing tables and updates Applying routing policies Manipulating routing behaviour eBGP & iBGP across ASs Differences and similarities How they interact AS routing via IGPs & iBGP Manipulating address management and route mapping Supernetting with Classless Inter Domain Routing (CIDR) Selecting addresses with CIDR Generating routes with aggregation The functions of aggregate commands; summary-only, as-set and suppress-map/attribute map Understanding route maps Map tags, sequence numbers; permit and deny commands Using match and set commands Matching criteria and setting action Related commands Using BGP for best path selection Examining AS path attribute Finding sources - origin attribute Examining nexthop attribute Multiaccess networks Non-broadcast networks (NBMA) The Network command Subnetting and supernetting Advertising BGP routes Routing Information Bases (RIB) Choosing preferred route - BGP backdoor & distance Metrics for pathway manipulation Best path forward with weight attribute Pathways with local preference, Community and metric attribute - (MED) BGP Synchronisation Disabling synchronisation |
Establishing BGP connections with neighbour commands Defining BGP neighbours Exchanging AS values with open messages Pinging routers to check connectivity Using loopback interface with neighbour command Increasing route flow between BGP with loopback Allowing external connectivity through eBGP multihop Load Balancing with neighbour eBGP multihop and neighbour update-source commands Filtering with BGP Filtering with access lists Receiving updates between neighbours AS path filtering Establishing path information with AS regular expressions Components of the regular expression and their functions Examining community filtering The functions of community commands and attributes Configuring filter lists for peer groups The interaction of BGP and IGPs (OSPF and RIP) Advantages of independant multiple routing networks The operation of "ships in the night" Gaining additional router resources Filtering your IGP into BGP using redistribution some dos and don’ts Examining various methods of generating routes from your autonomous system Securing loop free interdomain routing Advertising new origins with network command Alleviating fully meshed BGP with BGP confederation and Route Reflectors Diluting iBGP mesh with BGP confederation exchange routing through eBGP peers Configuring BGP confederation peers iBGP peering in AS with Route Reflectors (RR) Configuration, components and commands Identifying routing data with Route Reflectors and cluster lists Monitoring and troubleshooting BGP Examining BGP Route dampening Alleviate oscillations and route flapping on a network Identify badly defined routes Penalties with BGP dampening Route dampening commands and default parameters |
