BGP- Confederation

Confederation peer has EBGP peering between them. like in R3 & R5.

The NEXT_HOP attribute of routes external to the confederation is preserved throughout the confederation.
MULTI_EXIT_DISC attributes of routes advertised into a confederation are preserved throughout the confederation.
LOCAL_PREF attributes of routes are preserved throughout the entire confederation, not just within the member AS In which they are assigned

The AS numbers of the member autonomous systems are added to the AS_PATH within the confederation but are not advertised outside of the confederation.

Like in R6

     Network          Next Hop            Metric LocPrf Weight Path

 *>  11.11.1.1/32     5.5.5.5                                0 101 i

 *>  22.22.2.2/32     5.5.5.5                                0 101 i

 *>  33.3.3.3/32      5.5.5.5                                0 101 i

 *>  44.4.4.4/32      5.5.5.5                                0 101 201 i

 *>  55.5.5.5/32      5.5.5.5                  0             0 101 i

 *>  66.6.6.6/32      0.0.0.0                  0         32768 i


in R1

R1#sh ip bgp 22.22.2.2
BGP routing table entry for 22.22.2.2/32, version 47
Paths: (1 available, best #1, table default)
  Not advertised to any peer
  Refresh Epoch 1
  (65001)
    5.5.5.5 (metric 156160) from 3.3.3.3 (33.3.3.3)
      Origin IGP, metric 0, localpref 100, valid, confed-internal, best
      rx pathid: 0, tx pathid: 0x0

R1#