Hi all,
The solution provided for task 14.7 seems to be inaccurate, at least it makes me very confused.
configuring summary-address on R6 does not remove the BGP route to 172.16.8.8/32 received from R5. If only SW1 will see a /16 summary it makes sense.
In the solution-part it is stated that "If a router receives a summary-LSA with the down bit set on an interface that belongs to VRF, it simply drops this SLA". SW1 will indeed drop this LSA if it is an LSA type 3, but R6 will send the summary 172.16.0.0/16 as LSA type 5, not 3. This is simply not an issue with the summary-address configuration on R6.
But, if the summary-address 172.16.0.0 255.255.0.0 is configured on R5, R6 will redistribute this as an LSA3 to SW1, and the down bit check on LSA type 3 on SW1 is definitely an issue.
Baard