Configuration Guide User guide

1350 FastIron Configuration Guide
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BGP4 parameters
• Optional – Define neighbor distribute lists.
• Optional – Define BGP4 route maps for filtering routes redistributed into RIP and OSPF.
• Optional – Define route flap dampening parameters.
NOTE
When using the CLI, you set global level parameters at the BGP CONFIG level of the CLI. You can
reach the BGP CONFIG level by entering router bgp… at the global CONFIG level.
BGP4 parameter changes
Some parameter changes take effect immediately while others do not take full effect until the
router sessions with its neighbors are reset. Some parameters do not take effect until the router is
rebooted.
Parameter changes that take effect immediately
• Enable or disable BGP.
• Set or change the local AS.
• Add neighbors.
• Change the update timer for route changes.
• Disable or enable fast external fallover.
• Specify individual networks that can be advertised.
• Change the default local preference, default information originate setting, or administrative
distance.
• Enable or disable use of a default route to resolve a BGP4 next-hop route.
• Enable or disable MED (metric) comparison.
• Require the first AS in an Update from an EBGP neighbor to be the neighbor AS.
• Change MED comparison parameters.
• Disable comparison of the AS-Path length.
• Enable comparison of the router ID.
• Enable next-hop recursion.
• Enable or disable auto summary.
• Change the default metric.
• Disable or re-enable route reflection.
• Configure confederation parameters.
• Disable or re-enable load sharing.
• Change the maximum number of load-sharing paths.
• Change other load-sharing parameters.
• Define route flap dampening parameters.
• Add, change, or negate redistribution parameters (except changing the default MED; see
below).
• Add, change, or negate route maps (when used by the network command or a redistribution
command).