Dell PowerConnect B-RX Configuration Manual page 23

BigIron RX Series Configuration Guide
53-1001986-01
Chapter 26 Configuring BGP4 (IPv4 and IPv6)
Overview of BGP4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .731
Brocade implementation of BGP4 . . . . . . . . . . . . . . . . . . . . . . . . . .736
Memory considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .736
Configuring BGP4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .737
Activating and disabling BGP4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 740
Entering and exiting the address family configuration level . . . . . 741
Filtering specific IP addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 742
Defining an AS-path filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 743
Defining a community filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 744
Configuring a switch to allow routes with its own AS number . . . . 744
BGP Null0 routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 745
Aggregating routes advertised to BGP4 neighbors. . . . . . . . . . . . . 749
Configuring the device to always compare MEDs . . . . . . . . . . . . . . 749
Redistributing IBGP routes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .750
Disabling or re-enabling client-to-client route reflection. . . . . . . . .751
Configuring a route reflector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .751
Enabling or disabling comparison of the router IDs . . . . . . . . . . . .751
Configuring confederations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .752
Configuring route flap dampening . . . . . . . . . . . . . . . . . . . . . . . . . .755
Originating the default route . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .755
Changing the default local preference . . . . . . . . . . . . . . . . . . . . . .756
Changing the default metric used for redistribution. . . . . . . . . . . .756
Changing administrative distances . . . . . . . . . . . . . . . . . . . . . . . . .757
Requiring the first AS to be the neighbor's AS . . . . . . . . . . . . . . . .758
Enabling fast external fallover . . . . . . . . . . . . . . . . . . . . . . . . . . . . .758
Setting the local AS number. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .759
Changing the maximum number of shared BGP4 paths . . . . . . . .759
Treating missing MEDs as the worst MEDs . . . . . . . . . . . . . . . . . . .760
Customizing BGP4 load sharing. . . . . . . . . . . . . . . . . . . . . . . . . . . .760
Relationship between the BGP4 route table and the IP route
table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .732
How BGP4 selects a path for a route . . . . . . . . . . . . . . . . . . . .732
BGP4 message types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .734
When parameter changes take effect . . . . . . . . . . . . . . . . . . .739
Note regarding disabling BGP4. . . . . . . . . . . . . . . . . . . . . . . . . 741
Disabling or re-enabling comparison of the AS-path length . .750
Neighbor local-AS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .758
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