Topology
Addressing Table
Device
|
Interface
|
IPv6 Address
|
Prefix Length
|
Default Gateway
|
R1
|
G0/1
|
2001:DB8:ACAD:A::1
|
64
|
N/A
|
S1
|
VLAN 1
|
Assigned by SLAAC
|
64
|
Assigned by SLAAC
|
PC-A
|
NIC
|
Assigned by SLAAC and DHCPv6
|
64
|
Assigned by SLAAC
|
Objectives
Part 1: Build the Network and
Configure Basic Device Settings
Part 2: Troubleshoot IPv6
Connectivity
Part 3: Troubleshoot Stateless DHCPv6
Background / Scenario
The ability to troubleshoot network
issues is a very useful skill for network administrators. It is important to
understand IPv6 address groups and how they are used when troubleshooting a
network. Knowing what commands to use to extract IPv6 network information is necessary
to effectively troubleshoot.
In this lab, you will load configurations
on R1 and S1. These configurations will contain issues that prevent Stateless
DHCPv6 from functioning on the network. You will troubleshoot R1 and S1 to resolve
these issues.
Note: The routers used with CCNA hands-on labs
are Cisco 1941 Integrated Services Routers (ISRs) with Cisco IOS Release 15.2(4)M3
(universalk9 image). The switches used are Cisco Catalyst 2960s with Cisco IOS Release
15.0(2) (lanbasek9 image). Other routers, switches and Cisco IOS versions can
be used. Depending on the model and Cisco IOS version, the commands available
and output produced might vary from what is shown in the labs. Refer to the
Router Interface Summary Table at the end of this lab for the correct interface
identifiers.
Note: Make sure that the router and switch have been erased and have no
startup configurations. If you are unsure, contact your instructor.
Note: The default bias template used by the Switch Database Manager
(SDM) does not provide IPv6 address capabilities. Verify that SDM is using
either the dual-ipv4-and-ipv6
template or the lanbase-routing
template. The new template will be used after reboot even if the configuration
is not saved.
S1# show
sdm prefer
Follow this configuration to assign the dual-ipv4-and-ipv6 template as the
default SDM template:
S1# config
t
S1(config)# sdm
prefer dual-ipv4-and-ipv6 default
S1(config)# end
S1# reload
Required Resources
·
1 Router (Cisco 1941 with Cisco
IOS Release 15.2(4)M3 universal image or comparable)
·
1 Switch (Cisco 2960 with Cisco
IOS Release 15.0(2) lanbasek9 image or comparable)
·
1 PC (Windows 7, Vista, or XP
with terminal emulation program, such as Tera Term)
·
Console cables to configure the
Cisco IOS devices via the console ports
·
Ethernet cables as shown in the
topology
Part 1:
Build the Network and Configure
Basic Device Settings
In Part 1, you will set up the network
topology and clear any configurations if necessary. You will configure basic
settings on the router and switch. Then you will load the provided IPv6
configurations before you start troubleshooting.
Step 1:
Cable the network as shown in
the topology.
Step 2:
Initialize and reload the
router and the switch.
Step 3:
Configure basic settings on the
router and switch.
a.
Disable DNS lookup.
b.
Configure device names as shown
in the topology.
c.
Encrypt plain text passwords.
d.
Create a MOTD banner warning
users that unauthorized access is prohibited.
e.
Assign class as the encrypted privileged EXEC mode password.
f.
Assign cisco as the console and vty passwords and enable login.
g.
Configure logging synchronous to prevent console messages from interrupting
command entry.
Step 4:
Load the IPv6 configuration to
R1.
ip domain name ccna-lab.com
ipv6 dhcp pool IPV6POOL-A
dns-server
2001:DB8:ACAD:CAFE::A
domain-name ccna-lab.com
interface g0/0
no ip
address
shutdown
duplex
auto
speed auto
interface g0/1
no ip
address
duplex
auto
speed auto
ipv6
address FE80::1 link-local
ipv6
address 2001:DB8:ACAD:A::11/64
end
Step 5:
Load the IPv6 configuration to
S1.
interface range f0/1-24
shutdown
interface range g0/1-2
shutdown
interface Vlan1
shutdown
end
Step 6:
Save the running configurations
on R1 and S1.
Step 7:
Verify that IPv6 is enabled on PC-A.
Verify that IPv6 has been enabled in the
Local Area Connection Properties window on PC-A.
Part 2:
Troubleshoot IPv6 Connectivity
In Part 2, you will test and verify Layer
3 IPv6 connectivity on the network. Continue troubleshooting the network until
Layer 3 connectivity has been established on all devices. Do not continue to
Part 3 until you have successfully completed Part 2.
Step 1:
Troubleshoot IPv6 interfaces on
R1.
a.
According to the topology,
which interface must be active on R1 for network connectivity to be
established? Record any commands used to identify which interfaces are active.
____________________________________________________________________________________
b.
If necessary, take the steps
required to bring up the interface. Record the commands used to correct the
configuration errors and verify that the interface is active.
____________________________________________________________________________________
____________________________________________________________________________________
c.
Identify the IPv6 addresses
configured on R1. Record the addresses found and the commands used to view the
IPv6 addresses.
____________________________________________________________________________________
____________________________________________________________________________________
d.
Determine if a configuration
error has been made. If any errors are identified, record all the commands used
to correct the configuration.
____________________________________________________________________________________
____________________________________________________________________________________
____________________________________________________________________________________
e.
On R1, what multicast group is
needed for SLAAC to function?
____________________________________________________________________________________
f.
What command is used to verify
that R1 is a member of that group?
____________________________________________________________________________________
g.
If R1 is not a member of the
multicast group that is needed for SLAAC to function correctly, make the
necessary changes to the configuration so that it joins the group. Record any
commands necessary to correct the configurations errors.
____________________________________________________________________________________
h.
Re-issue the command to verify
that interface G0/1 has joined the all-routers multicast group (FF02::2).
Note: If you are unable to join the all-routers multicast group, you may
need to save your current configuration and reload the router.
Step 2:
Troubleshoot S1.
a.
Are the interfaces needed for
network connectivity active on S1? _______
Record any commands that are used to
activate necessary interfaces on S1.
____________________________________________________________________________________
____________________________________________________________________________________
____________________________________________________________________________________
____________________________________________________________________________________
b.
What command could you use to
determine if an IPv6 unicast address has been assigned to S1?
____________________________________________________________________________________
c.
Does S1 have an IPv6 unicast
address configured? If so, what is it?
____________________________________________________________________________________
d.
If S1 is not receiving a SLAAC
address, make the necessary configuration changes to allow it to receive one.
Record the commands used.
____________________________________________________________________________________
____________________________________________________________________________________
e.
Re-issue the command that verifies
that the interface now receives a SLAAC address.
f.
Can S1 ping the IPv6 unicast
address assigned to the G0/1 interface assigned to R1?
____________________________________________________________________________________
Step 3:
Troubleshoot PC-A.
a.
Issue the command used on PC-A to
verify the IPv6 address assigned. Record the command.
____________________________________________________________________________________
b.
What is the IPv6 unicast
address SLAAC is providing to PC-A?
____________________________________________________________________________________
c.
Can PC-A ping the default gateway
address that was assigned by SLAAC?
____________________________________________________________________________________
d.
Can PC-A ping the management
interface on S1?
____________________________________________________________________________________
____________________________________________________________________________________
____________________________________________________________________________________Note: Continue troubleshooting until
you can ping R1 and S1 from PC-A.
Part 3:
Troubleshoot Stateless DHCPv6
In Part 3, you will test and verify that
Stateless DHCPv6 is working correctly on the network. You will need to use the
correct IPv6 CLI commands on the router to determine if Stateless DHCPv6 is
working. You may want to use debug to help determine if the DHCP server is
being solicited.
Step 1:
Determine if Stateless DHCPv6
is functioning correctly.
a.
What is the name of the IPv6 DHCP
pool? How did you determine this?
____________________________________________________________________________________
____________________________________________________________________________________
b.
What network information is
listed in the DHCPv6 pool?
____________________________________________________________________________________
____________________________________________________________________________________
c.
Was the DHCPv6 information
assigned to PC-A? How did you determine this?
____________________________________________________________________________________
____________________________________________________________________________________
Step 2:
Troubleshoot R1.
a.
What commands can be used to
determine if R1 is configured for Stateless DHCPv6?
____________________________________________________________________________________
____________________________________________________________________________________
b.
Is the G0/1 interface on R1 in
Stateless DHCPv6 mode?
____________________________________________________________________________________
____________________________________________________________________________________
c.
What command can be used to
have R1 join the all-DHCPv6 server group?
____________________________________________________________________________________
____________________________________________________________________________________
d.
Verify that the all-DHCPv6
server group is configured for interface G0/1.
e.
Will PC-A receive the DHCP
information now? Explain?
____________________________________________________________________________________
____________________________________________________________________________________
f.
What is missing from the
configuration of G0/1 that causes hosts to use the DCHP server to retrieve
other network information?
____________________________________________________________________________________
g.
Reset the IPv6 settings on
PC-A.
1)
Open the Local Area Connection
Properties window, deselect the Internet Protocol Version 6 (TCP/IPv6) check
box, and then click OK to accept the
change.
2)
Open the Local Area Connection
Properties window again, click the Internet Protocol Version 6 (TCP/IPv6) check
box, and then click OK to accept the
change.
h.
Issue the command to verify
changes have been made on PC-A.
Note: Continue troubleshooting until PC-A receives the additional DHCP
information from R1.
Reflection
1.
What command is needed in the
DHCPv6 pool for Stateful DHCPv6 that is not needed for Stateless DHCPv6? Why?
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
2.
What command is needed on the
interface to change the network to use Stateful DHCPv6 instead of Stateless
DHCPv6?
_______________________________________________________________________________________
_______________________________________________________________________________________
Router Interface Summary Table
Router Interface Summary
|
||||
Router Model
|
Ethernet Interface #1
|
Ethernet Interface #2
|
Serial Interface #1
|
Serial Interface #2
|
1800
|
Fast Ethernet 0/0 (F0/0)
|
Fast Ethernet 0/1 (F0/1)
|
Serial 0/0/0 (S0/0/0)
|
Serial 0/0/1 (S0/0/1)
|
1900
|
Gigabit Ethernet 0/0 (G0/0)
|
Gigabit Ethernet 0/1 (G0/1)
|
Serial 0/0/0 (S0/0/0)
|
Serial 0/0/1 (S0/0/1)
|
2801
|
Fast Ethernet 0/0 (F0/0)
|
Fast Ethernet 0/1 (F0/1)
|
Serial 0/1/0 (S0/1/0)
|
Serial 0/1/1 (S0/1/1)
|
2811
|
Fast Ethernet 0/0 (F0/0)
|
Fast Ethernet 0/1 (F0/1)
|
Serial 0/0/0 (S0/0/0)
|
Serial 0/0/1 (S0/0/1)
|
2900
|
Gigabit Ethernet 0/0 (G0/0)
|
Gigabit Ethernet 0/1 (G0/1)
|
Serial 0/0/0 (S0/0/0)
|
Serial 0/0/1 (S0/0/1)
|
Note: To find out how the router is configured, look at the interfaces
to identify the type of router and how many interfaces the router has. There
is no way to effectively list all the combinations of configurations for each
router class. This table includes identifiers for the possible combinations
of Ethernet and Serial interfaces in the device. The table does not include
any other type of interface, even though a specific router may contain one.
An example of this might be an ISDN BRI interface. The string in parenthesis
is the legal abbreviation that can be used in Cisco IOS commands to represent
the interface.
|
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