BigIron RX Series Configuration Guide xxiii
53-1002253-01
Chapter 26 Configuring BGP4 (IPv4 and IPv6)
Overview of BGP4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .739
Relationship between the BGP4 route table and the IP route
table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 740
How BGP4 selects a path for a route . . . . . . . . . . . . . . . . . . . . 740
BGP4 message types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .742
Brocade implementation of BGP4 . . . . . . . . . . . . . . . . . . . . . . . . . . 744
Memory considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 744
Configuring BGP4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .745
When parameter changes take effect . . . . . . . . . . . . . . . . . . . 749
Activating and disabling BGP4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .750
Note regarding disabling BGP4. . . . . . . . . . . . . . . . . . . . . . . . .750
Entering and exiting the address family configuration level . . . . .751
Filtering specific IP addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . .751
Defining an AS-path filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .753
Defining a community filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .753
Configuring a switch to allow routes with its own AS number . . . .754
BGP Null0 routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .755
Aggregating routes advertised to BGP4 neighbors. . . . . . . . . . . . .759
Configuring the device to always compare MEDs. . . . . . . . . . . . . .759
Disabling or re-enabling comparison of the AS-path length . .760
Redistributing IBGP routes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .760
Disabling or re-enabling client-to-client route reflection. . . . . . . . .761
Configuring a route reflector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 761
Enabling or disabling comparison of the router IDs . . . . . . . . . . . . 761
Configuring confederations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .762
Configuring route flap dampening . . . . . . . . . . . . . . . . . . . . . . . . . .765
Originating the default route . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .765
Changing the default local preference . . . . . . . . . . . . . . . . . . . . . .766
Changing the default metric used for redistribution. . . . . . . . . . . .766
Changing administrative distances . . . . . . . . . . . . . . . . . . . . . . . . .767
Requiring the first AS to be the neighbor’s AS . . . . . . . . . . . . . . . .768
Neighbor local-AS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .768
Enabling fast external fallover . . . . . . . . . . . . . . . . . . . . . . . . . . . . .768
Setting the local AS number. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .769
Changing the maximum number of shared BGP4 paths . . . . . . . .769
Treating missing MEDs as the worst MEDs. . . . . . . . . . . . . . . . . . .770
Customizing BGP4 load sharing. . . . . . . . . . . . . . . . . . . . . . . . . . . .770
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