Packet Tracer – Configuring Trunks
Please click here to download topology 3.2.2.4 Packet Tracer - Configuring Trunks Instructions
Topology
3.2.2.4 Packet Tracer - Configuring Trunks Instructions |
Addressing Table
Device
|
Interface
|
IP Address
|
Subnet Mask
|
Switch Port
|
VLAN
|
PC1
|
NIC
|
172.17.10.21
|
255.255.255.0
|
S2 F0/11
|
10
|
PC2
|
NIC
|
172.17.20.22
|
255.255.255.0
|
S2 F0/18
|
20
|
PC3
|
NIC
|
172.17.30.23
|
255.255.255.0
|
S2 F0/6
|
30
|
PC4
|
NIC
|
172.17.10.24
|
255.255.255.0
|
S3 F0/11
|
10
|
PC5
|
NIC
|
172.17.20.25
|
255.255.255.0
|
S3 F0/18
|
20
|
PC6
|
NIC
|
172.17.30.26
|
255.255.255.0
|
S3 F0/6
|
30
|
Objectives
Part 1: Verify VLANs
Part 2: Configure Trunks
Background
Trunks are required to pass VLAN
information between switches. A port on a switch is either an access port or a
trunk port. Access ports carry traffic from a specific VLAN assigned to the
port. A trunk port by default is a member of all VLANs; therefore, it carries
traffic for all VLANs. This activity focuses on creating trunk ports, and
assigning them to a native VLAN other than the default.
Part 1: Verify VLANs
Step 1:
Display the current VLANs.
a.
On S1, issue the command that will display all VLANs configured. There
should be ten VLANs in total. Notice how all 26 ports on the switch are
assigned to one port or another.
b.
On S2 and S3, display and
verify all the VLANs are configured and assigned to the correct switch ports
according to the Addressing Table.
Step 2:
Verify loss of connectivity
between PCs on the same network.
Although PC1 and PC4 are on the
same network, they cannot ping one another. This is because the ports
connecting the switches are assigned to VLAN 1 by default. In order to provide
connectivity between the PCs on the same network and VLAN, trunks must be
configured.
Part 2: Configure Trunks
Step 1:
Configure trunking on S1 and
use VLAN 99 as the native VLAN.
a.
Configure G0/1 and G0/2
interfaces on S1 for trunking.
b.
Configure VLAN 99 as the native
VLAN for G0/1 and G0/2 interfaces on S1.
The trunk port takes about a minute to
become active due to Spanning Tree which you will learn in the proceeding
chapters. Click Fast Forward Time to
speed the process. After the ports become active, you will periodically receive
the following syslog messages:
%CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN
mismatch discovered on GigabitEthernet1/2 (99), with S3 GigabitEthernet1/2 (1).
%CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN
mismatch discovered on GigabitEthernet1/1 (99), with S2 GigabitEthernet1/1 (1).
You configured VLAN 99 as the native VLAN
on S1. However, the S2 and S3 are using VLAN 1 as the default native VLAN as
indicated by the syslog message.
Although you have a native VLAN mismatch,
pings between PCs on the same VLAN are now successful. Why?
____________________________________________________________________________________
____________________________________________________________________________________
____________________________________________________________________________________
Verify trunking is enabled on S2 and S3.
On S2
and S3, issue the show interface trunk command to confirm
that DTP has successfully negotiated trunking with S1 on S2 and S3. The output
also displays information about the trunk interfaces on S2 and S3.
Which active VLANs are allowed to across
the trunk?
_______________________________________________________________________________________
Step 2:
Correct the native VLAN
mismatch on S2 and S3.
a.
Configure VLAN 99 as the native
VLAN for the appropriate interfaces on S2 and S3.
b.
Issue show interface trunk command to verify the correct native VLAN
configuration.
Step 3:
Verify configurations on S2 and
S3.
a.
Issue the show interface interface switchport command to verify that the
native VLAN is now 99.
b.
Use the show vlan command to display information regarding configured
VLANs. Why is port G0/1 on S2 no longer assigned to VLAN 1?
____________________________________________________________________________________
Step 4:
Verify configurations on S2 and
S3.
a.
Issue the show interface interface switchport command to verify that the
native VLAN is now 99.
b.
Use the show vlan command to display information regarding configured
VLANs. Why is port G0/1 on S2 no longer assigned to VLAN 1?
Suggested Scoring Rubric
Packet Tracer scores 80 points. The three
questions in Step 1, 2 and 3 are worth 20 points.
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