I have been working on this lab and have a question regarding the AD manipulation in the workbook solution document. When EIGRP is redistributed into RIP on SW1, the metric is set to 15 to prevent BB3 advertising the routes elsewhere. This makes sense, and matches up with the requirements of the task.
My question is about the AD manipulation that SW is performing on a select group of routes, making EIGRP more preferred. I have completed this task without the extra step of AD manipulation and connectivity in the topology works with no issue. I don't understand why this was included in the solution reference if it isn't a needed step. My best guess is slightly more optimal routes?
Any help would be appreciated!
SW1:
router eigrp 100
redistribute rip metric 10000 1000 255 1 1500
!
router rip
!
! By using metric 15, BB3 cannot propagate redistributed prefixes
! any further as their metric reaches infinity.
!
redistribute eigrp 100 metric 15
distance 171 0.0.0.0 255.255.255.255 RIP_AD
!
ip access-list standard RIP_AD
permit 148.1.68.0 0.0.0.255
permit 148.1.8.0 0.0.0.255
permit 148.1.0.0 0.0.0.255
permit 148.1.6.0 0.0.0.255
permit 148.1.4.0 0.0.0.255
permit 148.1.18.0 0.0.0.255
permit 192.10.1.0 0.0.0.255