Cisco IOS Technologies

Cisco Lab 2017 Exam (OSPF)

You work as a network engineer for MTCOM Network Ltd company.  On router HQ, a provider link has been enabled and you must configure an IPV6 default route on HQ and make sure that this route is advertised in IPV6 OSPF process.  Also, you must trouveshoot another issue.  The router HQ is not forming an IPV6 OSPF neighbor relationship with router BR.

 

Topology Details

Two routers HQ and BR are connected via serial links.
Router HQ has interface Ethernet0/1 connected to the provider cloud and interface Ethernet 0/0 connected to RA1.

Router BR has interface Ethernet 0/0 connected to another router RA2.

IPV6 Routing Details

All routers are running IPV6 OSPF routing with process ID number 100.  Refer to the topology diagram for information about the OSPF areas.  The Loopback 0 IPV4 address is the OSPF router ID on each router.

Configuration requirements

Configure IPV6 default route on router HQ with default gateway as 2001:DB8:B:B1B2:1
Verify by pinging provider test IPV6 address 2001:DB8:0:1111::1 after configuring default route on HQ.
Make sure that the default route is advertised in IPV6 OSPF on router HQ.  This default route should be advertised only when HQ has default route in its routing table.Router HQ is not forming IPV6 OSPF neighbor with BR.  You must troubleshoot and resolve this issue.

Special Note: To gain the maximum number of option, you must complete the necessary configurations and fix IPV6 OSPF neighbor issue with router BR IPV6 OSPFv3 must ve configured without using address familles.  Do not change the IPV6 OSPF process ID.

Answer
Requirement (1): Configure IPv6 default route on router HQ with default gateway as 2001:DB8:B:B1B2::1.

HQ(config)# ipv6 unicast routing
HQ(config)# ipv6 route 0::/0 2001:DB8:B:B1B2::1

Requirement (2): Verify by pinging provider test IPv6 address 2001:DB8:0:1111::1 after configuring default route on HQ.

HQ# ping 2001:DB8:0:1111::1
!!!!!

Requirement (3): Make sure that the default route is advertised in IPv6 router HQ. This default route should be advertised only when HQ has a default route in its routing table.

|Here you must advertise the default route in IPv6 OSPF on HQ|
HQ(config) # ipv6 router ospf 100
HQ(config-rtr) # default-information originate always
HQ(config) # exit

Requirement (4): Router HQ is not forming IPv6 OSPF neighbor with BR. You must troubleshoot and resolve this issue.
1. Verify the OSPFv3 advertise on Serial 1/0 using the show run command:

HQ#show run
!
interface serial1/0
!
Note: Interface Serial 1/0 missing OSPFv3 advertise

2. Advertise the OSPFv3 on Serial 1/0:
HQ(config) # interface serial 1/0
HQ(config-if) # ipv6 ospf 100 area 0

3. Verify after OSPFv3 advertise:

HQ#show run
!
interface serial1/0
IPV6 OSPF 100 area 0
!

Finally: Save the configuration
HQ# copy running-config startup-config

 

route in its routing table.
|Here you must advertise the default route in IPv6 OSPF on HQ|
HQ(config) # ipv6 router ospf 100
HQ(config-rtr) # default-information originate always
HQ(config) # exit
Requirement (4): Router HQ is not forming IPv6 OSPF neighbor with BR. You must troubleshoot and resolve this issue.
1. Verify the OSPFv3 advertise on Serial 1/0 using the show run command:
Note: Interface Serial 1/0 missing OSPFv3 advertise
2. Advertise the OSPFv3 on Serial 1/0:
HQ(config) # interface serial 1/0
HQ(config-if) # ipv6 ospf 100 area 0
3. Verify after OSPFv3 advertise:
Finally: Save the configuration
HQ# copy running-config startup-config