This is one of multiple IP version 6 troubleshooting videos in this topology.
We've been told that to write a one on the left is not able to ping the looped back of rudder three
on the right.
So let's verify that ping 2001 face 3 We're getting an unreachable message so let's have a look at the
writing table.
Show IP vs 6 rot.
We've got a default route to write it to so when we use a trace route to that address.
Notice the traffic gets to write it too but gets no further.
So we're getting unreachable messages let's have a look at write to ping 2001 face 3.
Notice the output no valid front for destination.
So let's have a look at the writing table.
So show IP vs 6 round.
Do you see a raft in the routing table for the loop back of rudder 3.
This is a connected and local rat connected local.
There is no static ROT FOR THE LOOP BACK OF router 3.
This is a static route for the loop back over auto 1.
So show run pipe include route.
So here's the static route to write a one here's a default prompt pointing to or out of three.
So what do you think is the problem here.
We have a static Grant configured but it's not showing up in the writing table.
What's the problem let's have a look at our interfaces.
Show IP the six interface.
Brief Can you see the problem in the sound.
Put
notice gigabit to zero one is administratively down.
That's a problem.
So interface gigabit 0 1.
No shut show IP vs 6 round.
Suddenly we see the default rot in the IP routing table.
And if we're paying 2001 face 3 the ping succeeds on the site.
When we do the trace route notice it succeeds.
So right no one is able to ping the loop back of rudder 3.
Now don't forget IP vs 6 is a layer 3 protocol in the same way that IP version four is a layer 3 protocol
layer 3 protocols rely on layer 2 protocols and layer 1 protocols.
So show CTP neighbors would allow us to verify and check.
Layer 1 and layer 2 and we could also look at the interfaces on the router by using commands such as
Show interface gigabit 0 1 that would allow us to check if the interfaces are pop
or show IP vs 6 interface gigabit.
0 1.
This would show us whether the interface is up and also allow us to verify IP addresses configured on
that interface.
One of the hardest parts was troubleshooting networks is to narrow down where the problem is in the
network.
It could be something as simple as an interface shut down or a cable that's unplugged or a damaged cable
higher layer protocols rely on the lower layer protocols.
So you need to use the OSA model in your troubleshooting to help you find where the problem is.
This wasn't a layer 3 issue.
In other words it's not a routing issue or an IP version 6 issue.
It was a physical issue.
The interface on the rudder was shut down.
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