Users Guide

• Multiple instances of the same NLRI in the BGP RIB are not supported and are set to zero in the SNMP query response.
• The f10BgpM2NlriIndex and f10BgpM2AdjRibsOutIndex fields are not used.
• Carrying MPLS labels in BGP is not supported. The f10BgpM2NlriOpaqueType and f10BgpM2NlriOpaquePointer fields are
set to zero.
• 4-byte ASN is supported. The f10BgpM2AsPath4byteEntry table contains 4-byte ASN-related parameters based on the
configuration.
Traps (notifications) specified in the BGP4 MIB draft <draft-ietf-idr-bgp4–mibv2–05.txt> are not supported. Such traps
(bgpM2Established and bgpM2BackwardTransition) are supported as part of RFC 1657.
Configuration Information
The software supports BGPv4 as well as the following:
• deterministic multi-exit discriminator (MED) (default)
• a path with a missing MED is treated as worst path and assigned an MED value of (0xffffffff)
• the community format follows RFC 1998
• delayed configuration (the software at system boot reads the entire configuration file prior to sending messages to start
BGP peer sessions)
The following are not yet supported:
• auto-summarization (the default is no auto-summary)
• synchronization (the default is no synchronization)
BGP Configuration
To enable the BGP process and begin exchanging information, assign an AS number and use commands in ROUTER BGP mode
to configure a BGP neighbor.
By default, BGP is disabled.
By default, the system compares the MED attribute on different paths from within the same AS (the bgp always-compare-
med
command is not enabled).
NOTE: All newly configured neighbors and peer groups are disabled. To enable a neighbor or peer group, enter the
neighbor {ip-address | peer-group-name} no shutdown command.
The following table displays the default values for BGP in the Dell Networking OS.
Table 9. BGP Default Values
Item Default
BGP Neighbor Adjacency changes All BGP neighbor changes are logged.
Fast External Fallover feature Disabled
Graceful Restart feature Disabled
Local preference 100
MED 0
Route Flap Damping Parameters
half-life = 15 minutes
reuse = 750
suppress = 2000
max-suppress-time = 60 minutes
Border Gateway Protocol IPv4 (BGPv4) 179