Dell PowerConnect B-RX Configuration Manual page 23

BigIron RX Series Configuration Guide
53-1001810-01
Overview of BGP4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .738
Relationship between the BGP4 route table and the IP route table
739
How BGP4 selects a path for a route . . . . . . . . . . . . . . . . . . . . 740
BGP4 message types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 741
Brocade implementation of BGP4 . . . . . . . . . . . . . . . . . . . . . . . . . . 743
Memory considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 744
Configuring BGP4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 744
When parameter changes take effect . . . . . . . . . . . . . . . . . . . 746
Activating and disabling BGP4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 748
Note regarding disabling BGP4. . . . . . . . . . . . . . . . . . . . . . . . . 748
Entering and exiting the address family configuration level . . . . . 749
Filtering specific IP addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 749
Defining an AS-path filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .751
Defining a community filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .751
Configuring a switch to allow routes with its own AS number . . . .752
BGP Null0 routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .753
Aggregating routes advertised to BGP4 neighbors. . . . . . . . . . . . .757
Configuring the BigIron RX to always compare Multi-Exit Discriminators
(MEDs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .757
Disabling or re-enabling comparison of the AS-path length . .758
Redistributing IBGP routes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .758
Disabling or re-enabling client-to-client route reflection. . . . . . . . .759
Configuring a route reflector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .759
Enabling or disabling comparison of the router IDs . . . . . . . . . . . .759
Configuring confederations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .760
Configuring route flap dampening . . . . . . . . . . . . . . . . . . . . . . . . . .763
Originating the default route . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .764
Changing the default local preference . . . . . . . . . . . . . . . . . . . . . .764
Changing the default metric used for redistribution. . . . . . . . . . . .765
Changing administrative distances . . . . . . . . . . . . . . . . . . . . . . . . .765
Requiring the first AS to be the neighbor's AS . . . . . . . . . . . . . . . .766
Neighbor local-AS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .766
Enabling fast external fallover . . . . . . . . . . . . . . . . . . . . . . . . . . . . .767
Setting the local AS number. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .767
Changing the maximum number of shared BGP4 paths . . . . . . . .768
Treating missing MEDs as the worst MEDs . . . . . . . . . . . . . . . . . . .768
Customizing BGP4 load sharing. . . . . . . . . . . . . . . . . . . . . . . . . . . .769
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