OER MC Best Route Selection - Part 3

From the Master Controller R1 I trace to the loopback of R9.  It can be seen I have two valid paths: one via R4 and one via R5. 

trace 9.9.9.9

Type escape sequence to abort.

Tracing the route to 9.9.9.9

  1 11.11.11.2 84 msec

     10.10.10.1 72 msec

     11.11.11.2 56 msec

  2 12.1.1.5 72 msec

     13.1.1.6 72 msec

     12.1.1.5 56 msec

  3 21.0.0.9 [AS 2] 88 msec

     20.0.0.9 [AS 2] 120 msec *

I now enable oer 'route control' on the master. I also configure 'select exit best'.

oer master

mode route control

mode select-exit best

After a few minutes i notice the master has selected a best exit via R4. It achieves this by adjusting the bgp local preference.

s ip bgp 9.9.9.9
BGP routing table entry for 9.9.9.9/32, version 7
Paths: (2 available, best #2, table Default-IP-Routing-Table)
Multipath: iBGP
  Not advertised to any peer
  2
    13.1.1.6 (metric 110) from 5.5.5.5 (5.5.5.5)
      Origin incomplete, metric 409600, localpref 100, valid, internal
  2
    12.1.1.5 (metric 20) from 4.4.4.4 (4.4.4.4)S IP BG
      Origin incomplete, metric 409600, localpref 5000, valid, internal, best


 I now trace to R9 again and can see the path taken is the OER selected best route.

trace 9.9.9.9
Type escape sequence to abort.
Tracing the route to 9.9.9.9

  1 10.10.10.1 28 msec 44 msec 32 msec
  2 12.1.1.5 36 msec 56 msec 32 msec
  3 20.0.0.9 [AS 2] 36 msec *  72 msec