Origin........................................................................................................................................................................155AS Path.................................................................................................................................................................... 155Next Hop.................................................................................................................................................................. 156Multiprotocol BGP.......................................................................................................................................................... 156Implement BGP with Dell Networking OS....................................................................................................................... 157Additional Path (Add-Path) Support......................................................................................................................... 157Advertise IGP Cost as MED for Redistributed Routes...............................................................................................157Ignore Router-ID for Some Best-Path Calculations................................................................................................... 158Four-Byte AS Numbers.............................................................................................................................................158AS4 Number Representation.................................................................................................................................... 158AS Number Migration............................................................................................................................................... 160BGP4 Management Information Base (MIB)............................................................................................................. 161Important Points to Remember..................................................................................................................................161Configuration Information............................................................................................................................................... 162BGP Configuration..........................................................................................................................................................162Enabling BGP............................................................................................................................................................163Configuring AS4 Number Representations................................................................................................................166Configuring Peer Groups...........................................................................................................................................168Configuring BGP Fast Fall-Over................................................................................................................................170Configuring Passive Peering......................................................................................................................................172Maintaining Existing AS Numbers During an AS Migration........................................................................................ 172Allowing an AS Number to Appear in its Own AS Path..............................................................................................173Enabling Graceful Restart..........................................................................................................................................174Enabling Neighbor Graceful Restart.......................................................................................................................... 175Filtering on an AS-Path Attribute.............................................................................................................................. 175Regular Expressions as Filters................................................................................................................................... 177Redistributing Routes................................................................................................................................................178Enabling Additional Paths.......................................................................................................................................... 179Configuring IP Community Lists................................................................................................................................ 179Configuring an IP Extended Community List.............................................................................................................180Filtering Routes with Community Lists.......................................................................................................................181Manipulating the COMMUNITY Attribute.................................................................................................................. 181Changing MED Attributes......................................................................................................................................... 183Changing the LOCAL_PREFERENCE Attribute........................................................................................................183Changing the NEXT_HOP Attribute..........................................................................................................................184Changing the WEIGHT Attribute...............................................................................................................................184Enabling Multipath.................................................................................................................................................... 185Filtering BGP Routes................................................................................................................................................ 185Filtering BGP Routes Using Route Maps...................................................................................................................186Filtering BGP Routes Using AS-PATH Information.................................................................................................... 187Configuring BGP Route Reflectors............................................................................................................................187Aggregating Routes.................................................................................................................................................. 188Configuring BGP Confederations.............................................................................................................................. 188Enabling Route Flap Dampening................................................................................................................................189Changing BGP Timers............................................................................................................................................... 1917
