RIP does not advertise subnet 172.16.1.144/28. To remedy this problem, a static route is entered to that subnet but with a 27-bit mask. Because the mask references RTB's E0 interface, it is redistributed into RIP automatically.
interface Ethernet0 ip address 172.16.1.146 255.255.255.240 ipv6 address 2001:db8:0:190::2/64 ipv6 ospf 1 area 0 ! interface Ethernet1 ip address 172.16.1.98 255.255.255.224 ipv6 address 2001:db8:0:160::2/64 ipv6 rip ripdomain enable ! router ospf 1 redistribute rip metric 50 subnets network 172.16.1.0 0.0.0.255 area 0 ! router rip redistribute ospf 1 metric 2 passive-interface Ethernet0 network 172.16.0.0 ! ipv6 router rip ripdomain redistribute ospf 1 metric 2 ipv6 router ospf redistribute rip ripdomain metric 50 ip classless ip route 172.16.1.128 255.255.255.224 Ethernet0
RTB's configuration is
ipv6 router rip ripdomain redistribute ospf 1 metric 2 ipv6 router ospf redistribute rip ripdomain metric 50 summary-prefix 2001:db8:0:200::/48
interface Ethernet0 ip address 172.16.1.146 255.255.255.240 ip router isis ipv6 address 2001:db8:0:190::2/64 ipv6 router isis ! interface Ethernet1 ip address 172.16.1.98 255.255.255.224 ip summary-address eigrp 1 172.16.1.128 255.255.255.128 ipv6 address 2001:db8:0:160::2/64 ipv6 rip ripdomain enable ! router eigrp 1 redistribute isis level-1 metric 10000 1000 255 1 1500 passive-interface Ethernet0 network 172.16.0.0 ! router isis net 00.0000.1234.abc1.00 summary-address 172.16.2.0 255.255.255.0 redistribute eigrp 1 metric 20 metric-type external level-1 address-family ipv6 summary-prefix 2001:db8:0:200::/48 redistribute rip metric 20 metric-type external level-1 ! ipv6 router rip ripdomain redistribute isis metric 5
