PLANNED

BGP Deep Dive

eBGP and iBGP topology covering all major path selection attributes, route reflectors, confederations, communities, and advanced prefix manipulation.

eBGP iBGP Route Reflectors Confederations Communities AS-path prepending Aggregation Path selection

topology screenshot coming soon replace with: lab-bgp.png

COVERAGE

BGP Peering

eBGP between AS boundaries
iBGP full mesh
Route reflectors with clients
Confederation sub-AS design
Next-hop-self on iBGP peers

Path Selection

Weight (Cisco local)
Local preference
AS-path length
MED
eBGP vs iBGP preference
IGP metric to next-hop

Communities

Standard communities
No-export / no-advertise
Custom community tagging
Community-based routing policy
ip community-list matching

Prefix Control

AS-path prepending for inbound control
Aggregate-address with suppress-map
Summary-only aggregation
Prefix filtering with prefix-list
Route maps on neighbor statements

NOTES

Planned as the ENARSI BGP study lab. Will include at least 3 autonomous systems with both eBGP and iBGP sessions, one confederation, and route reflectors replacing the full mesh in one AS. Communities will be used to influence routing policy across AS boundaries.