It is a stub area, no summary lsa in this area

Generates stub default route with cost 1

SPF algorithm executed 5 times

Number of LSA 7. Checksum Sum 0x028798

Number of DCbitless LSA 0

Number of indication LSA 0

Number of DoNotAge LSA 0

Flood list length 0

R2#

What is meant by the high-lighted output for Area 51?

R2 has a single interface that is a member of area 51. The “stub, no summary” indicates that this is a totally stubby area. “Generates stub default route” means that R2, the ABR, is generating the default route received by internal routers such as R1. It is not the default route advertised by the ASBR R3.

Device Configurations (Instructor version)

Initial Configurations

Router R1

hostname R1

!

interface GigabitEthernet0/0

ip address 192.168.1.1 255.255.255.0

ipv6 address FE80::1 link-local

ipv6 address 2001:DB8:CAFE:1::1/64

no shutdown

!

interface Serial0/0/0

ip address 192.168.2.1 255.255.255.252

ipv6 address FE80::1 link-local

ipv6 address 2001:DB8:CAFE:2::1/64

clock rate 64000

no shutdown

!

end

Router R2

hostname R2

!

interface GigabitEthernet0/0

ip address 192.168.3.1 255.255.255.0

ipv6 address FE80::2 link-local

ipv6 address 2001:DB8:CAFE:3::1/64

no shutdown

!

interface Serial0/0/0

ip address 192.168.2.2 255.255.255.252

ipv6 address FE80::2 link-local

ipv6 address 2001:DB8:CAFE:2::2/64

no shutdown

!

interface Serial0/0/1

ip address 192.168.4.1 255.255.255.252

ipv6 address FE80::2 link-local

ipv6 address 2001:DB8:CAFE:4::1/64

clock rate 64000

no shutdown

!

end

Router R3

hostname R3

!

interface GigabitEthernet0/0

ip address 192.168.5.1 255.255.255.0

ipv6 address FE80::3 link-local

ipv6 address 2001:DB8:CAFE:5::1/64

no shutdown

!

interface Serial0/0/1

ip address 192.168.4.2 255.255.255.252

ipv6 address FE80::3 link-local

ipv6 address 2001:DB8:CAFE:4::2/64

no shutdown

!

interface Serial0/1/0

ip address 192.168.77.2 255.255.255.0

ipv6 address FE80::3 link-local

ipv6 address 2001:DB8:FEED:77::2/64

clock rate 64000

no shutdown

!

end

Router R4

hostname R4

!

interface Serial0/0/0

ip address 192.168.77.1 255.255.255.0

ipv6 address FE80::4 link-local

ipv6 address 2001:DB8:FEED:77::1/64

no shutdown

!

interface GigabitEthernet0/0

ip address 192.168.99.1 255.255.255.0

ipv6 address 2001:db8:99:1::1/64

no shutdown

!

ipv6 unicast-routing

ipv6 route 2001:DB8:CAFE::/48 2001:DB8:FEED:77::2

ip route 192.168.0.0 255.255.0.0 192.168.77.2

!

end

Final Configurations

Router R1

hostname R1

!

ipv6 unicast-routing

ipv6 cef

!

interface GigabitEthernet0/0

ip address 192.168.1.1 255.255.255.0

ip ospf 1 area 51

ipv6 address FE80::1 link-local

ipv6 address 2001:DB8:CAFE:1::1/64

ipv6 ospf 2 area 51

!

interface Serial0/0/0

ip address 192.168.2.1 255.255.255.252

ip ospf 1 area 51

ipv6 address FE80::1 link-local

ipv6 address 2001:DB8:CAFE:2::1/64

ipv6 ospf 2 area 51

clock rate 64000

!

router ospf 1

router-id 1.1.1.1

area 51 stub

!

ipv6 router ospf 2

router-id 1.1.1.1

area 51 stub

!

end

Router R2

hostname R2

!

ipv6 unicast-routing

ipv6 cef

!

interface GigabitEthernet0/0

ip address 192.168.3.1 255.255.255.0

ip ospf 1 area 0

ipv6 address FE80::2 link-local

ipv6 address 2001:DB8:CAFE:3::1/64

ipv6 ospf 2 area 0

!

interface Serial0/0/0

ip address 192.168.2.2 255.255.255.252

ip ospf 1 area 51

ipv6 address FE80::2 link-local

ipv6 address 2001:DB8:CAFE:2::2/64

ipv6 ospf 2 area 51

!

interface Serial0/0/1

ip address 192.168.4.1 255.255.255.252

ip ospf 1 area 0

ipv6 address FE80::2 link-local

ipv6 address 2001:DB8:CAFE:4::1/64

ipv6 ospf 2 area 0

clock rate 64000

!

router ospf 1

router-id 2.2.2.2

area 51 stub no-summary

!

ipv6 router ospf 2

router-id 2.2.2.2

area 51 stub no-summary

!

end