Dell S3048-ON User Manual

Congure BFD for VRRP.........................................................................................................................................162
Conguring Protocol Liveness................................................................................................................................165
Troubleshooting BFD................................................................................................................................................165
9 Border Gateway Protocol IPv4 (BGPv4).....................................................................................................167
Autonomous Systems (AS)........................................................................................................................................... 167
Sessions and Peers........................................................................................................................................................ 169
Establish a Session...................................................................................................................................................169
Route Reectors.............................................................................................................................................................170
BGP Attributes.................................................................................................................................................................171
Best Path Selection Criteria.....................................................................................................................................171
Weight........................................................................................................................................................................173
Local Preference....................................................................................................................................................... 173
Multi-Exit Discriminators (MEDs)........................................................................................................................... 174
Origin..........................................................................................................................................................................175
AS Path......................................................................................................................................................................176
Next Hop................................................................................................................................................................... 176
Multiprotocol BGP..........................................................................................................................................................176
Implement BGP with Dell Networking OS................................................................................................................... 177
Additional Path (Add-Path) Support...................................................................................................................... 177
Advertise IGP Cost as MED for Redistributed Routes.........................................................................................177
Ignore Router-ID in Best-Path Calculation............................................................................................................ 178
Four-Byte AS Numbers............................................................................................................................................178
AS4 Number Representation.................................................................................................................................. 178
AS Number Migration.............................................................................................................................................. 180
BGP4 Management Information Base (MIB).........................................................................................................181
Important Points to Remember...............................................................................................................................181
Conguration Information..............................................................................................................................................182
BGP Conguration......................................................................................................................................................... 182
Enabling BGP............................................................................................................................................................ 183
Conguring AS4 Number Representations........................................................................................................... 186
Conguring Peer Groups.........................................................................................................................................188
Conguring BGP Fast Fall-Over.............................................................................................................................190
Conguring Passive Peering................................................................................................................................... 192
Maintaining Existing AS Numbers During an AS Migration................................................................................. 192
Allowing an AS Number to Appear in its Own AS Path....................................................................................... 193
Enabling Graceful Restart........................................................................................................................................194
Enabling Neighbor Graceful Restart...................................................................................................................... 195
Filtering on an AS-Path Attribute........................................................................................................................... 195
Regular Expressions as Filters.................................................................................................................................197
Redistributing Routes...............................................................................................................................................198
Enabling Additional Paths........................................................................................................................................ 199
Conguring IP Community Lists.............................................................................................................................199
Conguring an IP Extended Community List....................................................................................................... 200
Filtering Routes with Community Lists..................................................................................................................201
Manipulating the COMMUNITY Attribute............................................................................................................ 202
Contents
7

Dell S3048-ON Specifications

General

Rack Units	1U
Form Factor	Rack-mountable
Input Voltage	100-240V AC
Power Supply	2 hot-swappable power supplies
Management	CLI, Web, SNMP
Product Type	Switch
MAC Address Table Size	32K entries
Jumbo Frame Support	Yes
Latency	< 3 microseconds
Ports	48 x 1GbE RJ45, 4 x 10GbE SFP+