1. R10,R11,R20,R21,R14,R15 should advertise default route and 10.x.0.0/16
ip prefix-list FILTER seq 10 permit 10.0.0.0/13 ge 16 le 16
ip prefix-list FILTER seq 15 permit 0.0.0.0/0

2. NAT loopback 123 applied on R14,R15,R24,R25

3. Multicast

SW100:
SW100#show ip pim rp mapping
PIM Group-to-RP Mappings
This system is an RP (Auto-RP)
This system is an RP-mapping agent
Group(s) 239.250.0.0/16 RP 10.250.250.250 (DC1-RP), v2v1
Info source: 10.250.250.250 (?), elected via Auto-RP
Uptime: 01:46:57, expires: 00:01:59

Similar not remember exact output on R30 Info source: 10.250.250.250 (?)

3. Ipv6 ..server1 was not getting ipv6 address after configured DHCPv6 server config