Brocade TurboIron 24X Series Configuration Guide User Manual
Page 19
Brocade TurboIron 24X Series Configuration Guide
xix
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Overview of BGP4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .660
Relationship between the BGP4 route table and the IP route table
660
How BGP4 selects a path for a route . . . . . . . . . . . . . . . . . . . .661
BGP4 message types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .663
Basic configuration and activation for BGP4 . . . . . . . . . . . . . . . . .665
Note regarding disabling BGP4. . . . . . . . . . . . . . . . . . . . . . . . .665
BGP4 parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .666
When parameter changes take effect . . . . . . . . . . . . . . . . . . .667
Memory considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .668
Memory configuration options obsoleted by dynamic memory669
Basic configuration tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .669
Enabling BGP4 on the router . . . . . . . . . . . . . . . . . . . . . . . . . .669
Changing the router ID. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .669
Setting the local AS number . . . . . . . . . . . . . . . . . . . . . . . . . . .670
Adding a loopback interface . . . . . . . . . . . . . . . . . . . . . . . . . . .670
Adding BGP4 neighbors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .671
Adding a BGP4 peer group . . . . . . . . . . . . . . . . . . . . . . . . . . . .677
Optional configuration tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .681
Changing the Keep Alive Time and Hold Time . . . . . . . . . . . . .681
Changing the BGP4 next-hop update timer . . . . . . . . . . . . . . .682
Enabling fast external fallover. . . . . . . . . . . . . . . . . . . . . . . . . .682
Changing the maximum number of paths for
BGP4 load sharing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .683
Customizing BGP4 load sharing . . . . . . . . . . . . . . . . . . . . . . . .684
Specifying a list of networks to advertise. . . . . . . . . . . . . . . . .685
Changing the default local preference . . . . . . . . . . . . . . . . . . .686
Using the IP default route as a valid next hop for
a BGP4 route . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .687
Advertising the default route. . . . . . . . . . . . . . . . . . . . . . . . . . .687
Changing the default MED (Metric) used for
route redistribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .687
Enabling next-hop recursion . . . . . . . . . . . . . . . . . . . . . . . . . . .688
Changing administrative distances . . . . . . . . . . . . . . . . . . . . .691
Requiring the first AS to be the neighbor AS . . . . . . . . . . . . . .692
Disabling or re-enabling comparison of the AS-Path length . .692
Enabling or disabling comparison of the router IDs . . . . . . . .693
Configuring the Layer 3 Switch to always compare
Multi-Exit Discriminators (MEDs) . . . . . . . . . . . . . . . . . . . . . . .693
Treating missing MEDs as the worst MEDs . . . . . . . . . . . . . . .694
Configuring route reflection parameters . . . . . . . . . . . . . . . . .694
Aggregating routes advertised to BGP4 neighbors . . . . . . . . .698