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OSPFv3 — the same network, routed twice
Enterprise Intermediate 5 devices 5 checked tasks 100 points Plan lab
Three routers already carry IPv4. Add IPv6 alongside it and route it with OSPFv3 — which has no network statements at all: an interface is in the process because the interface says so. Then read a route whose next hop is a link-local address. You build it in a browser, type real commands at each device, and every task below is
checked against the running configuration — so you find out it is wrong before anybody else does.
Open this lab in the simulator
The simulator runs in your browser with nothing to install. This lab is part of the full simulator: open it free for 7 days with a new account, then with a plan. It needs an account, which keeps your progress.
The scenario
Three routers already carry IPv4. Add IPv6 alongside it and route it with OSPFv3 — which has no network statements at all: an interface is in the process because the interface says so. Then read a route whose next hop is a link-local address.
Your role: a network engineer on the enterprise team. Level: Intermediate Done when: all 5 goals show as passed (100 points).
Network status
Devices: 3 routers, 2 PCs, cabled as drawn. No Layer 1 or Layer 2 faults: every link is connected and up. R1 starts with addresses (L0 1.1.1.1/32, G0/0 2001:db8:a::1/64, G0/1 2001:db8:12::1/64). R2 starts with addresses (L0 2.2.2.2/32, G0/1 2001:db8:12::2/64, G0/2 2001:db8:23::1/64). R3 starts with addresses (L0 3.3.3.3/32, G0/0 2001:db8:c::1/64, G0/2 2001:db8:23::2/64). Known problems
None: nothing is misconfigured. The network is simply not finished: what the goals list is what you have to build or secure. Goals
IPv6 routing is enabled on all three routers (15 pts) R2 has an OSPFv3 adjacency on both sides (25 pts) R1 learns the far LAN by OSPFv3, not statically (25 pts) R3 learns R1’s LAN the same way (15 pts) A host at one end reaches a host at the other over IPv6 (20 pts) The activity, in order
IPv6 routing is enabled on all three routers Why: Each goal is a state the lab can check on the running device. Verify with: show running-config R2 has an OSPFv3 adjacency on both sides Why: Each goal is a state the lab can check on the running device. Verify with: show running-config R1 learns the far LAN by OSPFv3, not statically Why: Each goal is a state the lab can check on the running device. Verify with: show running-config R3 learns R1’s LAN the same way Why: Each goal is a state the lab can check on the running device. Verify with: show running-config A host at one end reaches a host at the other over IPv6 Why: A ping needs a route in BOTH directions. This is the end-to-end proof that everything before it worked. Verify with: ping 2001:db8:c::10 Tips
Work in the order given: later goals depend on the earlier ones. After every change, run the verify command before moving on; do not guess. Stuck? Read the verify output first. It names the interface, neighbour or route that is wrong. Why this matters
Three routers already carry IPv4. Add IPv6 alongside it and route it with OSPFv3 — which has no network statements at all: an interface is in the process because the interface says so. Then read a route whose next hop is a link-local address.
What you will be able to do
IPv6 routing is enabled on all three routers
R2 has an OSPFv3 adjacency on both sides
R1 learns the far LAN by OSPFv3, not statically
R3 learns R1’s LAN the same way
The network
ISR 2921, PC — 5 devices in all, already cabled.
Gi0/1 2001:db8:12::1/64 Gi0/1 2001:db8:12::2/64 Gi0/2 2001:db8:23::1/64 Gi0/2 2001:db8:23::2/64 Gi0/0 2001:db8:a::1/64 Fa0 Gi0/0 2001:db8:c::1/64 Fa0 R1 R2 R3 H1 H3 Drawn from this lab: devices, cables, ports and the addresses already set. Device Model Address already set
R1 ISR 2921 configure it R2 ISR 2921 configure it R3 ISR 2921 configure it H1 PC configure it H3 PC configure it
Cabling
R1 Gi0/1 ↔ R2 Gi0/1 R2 Gi0/2 ↔ R3 Gi0/2 R1 Gi0/0 ↔ H1 Fa0 R3 Gi0/0 ↔ H3 Fa0
What is configured at the start
These are already configured when the lab opens — including, where this is a troubleshooting lab, the fault itself:
R1 interface Loopback0
ip address 1.1.1.1 255.255.255.255
exit
interface GigabitEthernet0/0
ipv6 address 2001:db8:a::1/64
no shutdown
exit
interface GigabitEthernet0/1
ipv6 address 2001:db8:12::1/64
no shutdown
exit R2 interface Loopback0
ip address 2.2.2.2 255.255.255.255
exit
interface GigabitEthernet0/1
ipv6 address 2001:db8:12::2/64
no shutdown
exit
interface GigabitEthernet0/2
ipv6 address 2001:db8:23::1/64
no shutdown
exit R3 interface Loopback0
ip address 3.3.3.3 255.255.255.255
exit
interface GigabitEthernet0/0
ipv6 address 2001:db8:c::1/64
no shutdown
exit
interface GigabitEthernet0/2
ipv6 address 2001:db8:23::2/64
no shutdown
exit Tasks, and how each one is checked
Every task is decided by reading the live network — a neighbour in FULL, a ping that succeeds, a line in the running configuration — not by looking for a keyword you typed. The same command shows you what the lab sees.
# Task Pts How to verify it yourself
1 IPv6 routing is enabled on all three routers 15 Checked automatically against the device’s live state (ipv6Routing). and Checked automatically against the device’s live state (ipv6Routing). and Checked automatically against the device’s live state (ipv6Routing). 2 R2 has an OSPFv3 adjacency on both sides 25 Checked automatically against the device’s live state (ospf6Nbrs). 3 R1 learns the far LAN by OSPFv3, not statically 25 Checked automatically against the device’s live state (route6Type). 4 R3 learns R1’s LAN the same way 15 Checked automatically against the device’s live state (route6Type). 5 A host at one end reaches a host at the other over IPv6 20 On H1: ping 2001:db8:c::10 must succeed.
Stuck? Ask the coach
Tell the coach what you see or what you tried. It gives you a hint, not the answer, the way a senior engineer would. Included with a free trial or any plan.
Ask the coach
Reference solution
Try it yourself first — the lab checks your work either way. This is one configuration that makes every task pass, device by device:
R1 ipv6 unicast-routing
interface GigabitEthernet0/0
ipv6 ospf 1 area 0
exit
interface GigabitEthernet0/1
ipv6 ospf 1 area 0
exit R2 ipv6 unicast-routing
interface GigabitEthernet0/1
ipv6 ospf 1 area 0
exit
interface GigabitEthernet0/2
ipv6 ospf 1 area 0
exit R3 ipv6 unicast-routing
interface GigabitEthernet0/0
ipv6 ospf 1 area 0
exit
interface GigabitEthernet0/2
ipv6 ospf 1 area 0
exit Where this is examined
This lab practises these topics in the zNetLaB certification courses:
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