Administrator Guide

● 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
Distance
external distance = 20
internal distance = 200
local distance = 200
Timers
keepalive = 60 seconds
holdtime = 180 seconds
Add-path Disabled
Enabling BGP
By default, BGP is not enabled on the system. The Dell Networking OS supports one autonomous system (AS) and assigns the
AS number (ASN).
To establish BGP sessions and route traffic, configure at least one BGP neighbor or peer.
180
Border Gateway Protocol IPv4 (BGPv4)