Flow-Based Monitoring Support for ACLs...................................................................................................................... 136Behavior of Flow-Based Monitoring.......................................................................................................................... 137Enabling Flow-Based Monitoring...............................................................................................................................138Configuring UDF ACL..................................................................................................................................................... 1399 Bidirectional Forwarding Detection (BFD)....................................................................142How BFD Works............................................................................................................................................................. 142BFD Packet Format.................................................................................................................................................. 143BFD Sessions............................................................................................................................................................144BFD Three-Way Handshake...................................................................................................................................... 145Session State Changes............................................................................................................................................. 147Important Points to Remember....................................................................................................................................... 147Configure BFD................................................................................................................................................................ 147Configure BFD for Physical Ports..............................................................................................................................148Configure BFD for Static Routes............................................................................................................................... 151Configure BFD for OSPF.......................................................................................................................................... 152Configure BFD for OSPFv3.......................................................................................................................................154Configure BFD for IS-IS............................................................................................................................................ 156Configure BFD for BGP............................................................................................................................................ 158Configure BFD for VRRP.......................................................................................................................................... 164Configuring Protocol Liveness...................................................................................................................................167Troubleshooting BFD.................................................................................................................................................16710 Border Gateway Protocol IPv4 (BGPv4).................................................................... 169Autonomous Systems (AS)............................................................................................................................................. 169Sessions and Peers.......................................................................................................................................................... 171Establish a Session.....................................................................................................................................................171Route Reflectors............................................................................................................................................................. 172BGP Attributes................................................................................................................................................................173Best Path Selection Criteria...................................................................................................................................... 173Weight...................................................................................................................................................................... 175Local Preference....................................................................................................................................................... 175Multi-Exit Discriminators (MEDs)..............................................................................................................................176Origin........................................................................................................................................................................ 177AS Path.....................................................................................................................................................................177Next Hop.................................................................................................................................................................. 178Multiprotocol BGP...........................................................................................................................................................178Implement BGP with Dell Networking OS....................................................................................................................... 179Additional Path (Add-Path) Support......................................................................................................................... 179Advertise IGP Cost as MED for Redistributed Routes...............................................................................................179Ignore Router-ID in Best-Path Calculation.................................................................................................................180Four-Byte AS Numbers.............................................................................................................................................180AS4 Number Representation.................................................................................................................................... 180AS Number Migration............................................................................................................................................... 182BGP4 Management Information Base (MIB).............................................................................................................183Important Points to Remember.................................................................................................................................1837
