Overview Of Bgp4 - Dell PowerConnect B-RX Configuration Manual

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Overview of BGP4

Overview of BGP4
BGP4 is the standard Exterior Gateway Protocol (EGP) used on the Internet to route traffic between
Autonomous Systems (AS) and to maintain loop-free routing. An autonomous system is a collection
of networks that share the same routing and administration characteristics. For example, a
corporate Intranet consisting of several networks under common administrative control might be
considered an AS. The networks in an AS can but do not need to run the same routing protocol to
be in the same AS, nor do they need to be geographically close.
Routers within an AS can use different Interior Gateway Protocols (IGPs) such as RIP and OSPF to
communicate with one another. However, for routers in different ASs to communicate, they need to
use an EGP. BGP4 is the standard EGP used by Internet routers and therefore is the EGP
implemented on BigIron RX.
738
•
Using the IP default route as a valid next hop for a BGP4 route . . . . . . . . 781
•
Enabling next-hop recursion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 781
•
Modifying redistribution parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 784
•
Using a table map to set the tag value . . . . . . . . . . . . . . . . . . . . . . . . . . . . 787
•
Changing the keep alive time and hold time . . . . . . . . . . . . . . . . . . . . . . . . 787
•
Changing the BGP4 next-hop update timer . . . . . . . . . . . . . . . . . . . . . . . . . 788
•
Changing the router ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 788
•
Adding a loopback interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 789
•
Changing the maximum number of paths for BGP4 load sharing . . . . . . . 789
•
Configuring route reflection parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . 790
•
Filtering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 792
•
Displaying BGP4 information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 822
•
Generalized TTL security mechanism support . . . . . . . . . . . . . . . . . . . . . . 852
BigIron RX Series Configuration Guide
53-1001810-01