Administrator Guide

ManualsBrandsDell ManualsAccess PlatformsPowerSwitch S3048-ON

Congure BFD for VRRP.........................................................................................................................................164

Conguring Protocol Liveness................................................................................................................................ 167

Troubleshooting BFD................................................................................................................................................ 167

9 Border Gateway Protocol IPv4 (BGPv4).................................................................................................... 169

Autonomous Systems (AS)...........................................................................................................................................169

Sessions and Peers......................................................................................................................................................... 171

Establish a Session....................................................................................................................................................171

Route Reectors.............................................................................................................................................................172

BGP Attributes................................................................................................................................................................173

Best Path Selection Criteria.................................................................................................................................... 173

Weight........................................................................................................................................................................175

Local Preference....................................................................................................................................................... 175

Multi-Exit Discriminators (MEDs)...........................................................................................................................176

Origin.......................................................................................................................................................................... 177

AS Path...................................................................................................................................................................... 178

Next Hop................................................................................................................................................................... 178

Multiprotocol BGP.......................................................................................................................................................... 178

Implement BGP with Dell Networking OS...................................................................................................................179

Additional Path (Add-Path) Support......................................................................................................................179

Advertise IGP Cost as MED for Redistributed Routes........................................................................................ 179

Ignore Router-ID in Best-Path Calculation............................................................................................................ 180

Four-Byte AS Numbers........................................................................................................................................... 180

AS4 Number Representation.................................................................................................................................. 180

AS Number Migration.............................................................................................................................................. 182

BGP4 Management Information Base (MIB)........................................................................................................183

Important Points to Remember.............................................................................................................................. 183

Conguration Information..............................................................................................................................................184

BGP Conguration......................................................................................................................................................... 184

Enabling BGP............................................................................................................................................................ 185

Conguring AS4 Number Representations........................................................................................................... 188

Conguring Peer Groups.........................................................................................................................................190

Conguring BGP Fast Fall-Over.............................................................................................................................192

Conguring Passive Peering................................................................................................................................... 194

Maintaining Existing AS Numbers During an AS Migration.................................................................................194

Allowing an AS Number to Appear in its Own AS Path.......................................................................................195

Enabling Graceful Restart....................................................................................................................................... 196

Enabling Neighbor Graceful Restart.......................................................................................................................197

Filtering on an AS-Path Attribute............................................................................................................................197

Regular Expressions as Filters.................................................................................................................................199

Redistributing Routes..............................................................................................................................................200

Enabling Additional Paths........................................................................................................................................ 201

Conguring IP Community Lists............................................................................................................................. 201

Conguring an IP Extended Community List....................................................................................................... 202

Filtering Routes with Community Lists................................................................................................................. 203

Manipulating the COMMUNITY Attribute............................................................................................................204

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