In
this lab you’ll familiarize yourself with the following new
commands;
Command
|
Description
|
|---|---|
encapsulation
dot1Q #
|
This
command is executed from ethernet sub-interface configuration
mode and binds the sub interface(s) to a particular 802.1q tagged
vlan.
|
no
ip routing
|
This
command is executed from global configuration and disables the
routers ability to be used as a router, effectively turning it
into a test client machine like a windows box.
|
ip
default-gateway 1.2.3.4
|
This
command is executed in global configuration mode to configure a
non-routing device to use the specific IP Address as a
default-gateway.
|
show
ip interface brief
|
This
command can be executed from user or privileged mode to view the
current IP addresses of all interfaces on the device.
|
Lab Prerequisites
- Establish a console session with devices R1, R2, R3 and SW1 than configure the devices respected hostname(s).
- Create VLAN’s 20 and 30 on SW1 and configure interface Fa0/1 on SW1 as an 802.1q trunk link.
- On SW1 configure interface Fa0/2 to access VLAN20 and Fa0/3 to access VLAN 30.
- Configure the IP address 10.1.20.2/24 on R2′s FastEthernet0/0 interface.
- Configure the IP address 10.1.30.3/24 on R3′s Fastethernet0/0 interface.
Lab Objectives
- Configure a new Sub-Interface on R1 to match the VLAN 20 (Fa0/0.20) and configure the sub-interface to use 802.1q encapsulation and the Dot1q tag of 20. Configure the sub-interface to use the IP address 10.1.20.1/24.
- Configure a new Sub-Interface on R1 to match the VLAN 30 (Fa0/0.30) and configure the sub-interface to use 802.1q encapsulation and the Dot1q tag of 30. Configure the sub-interface to use the IP address 10.1.30.1/24. Verify your sub-interface configuration.
- Disable IP Routing on R2 and R3 and configure the default gateway on R2 and R3 to use R1′s respected Sub-interface as the default gateway.
- Verify that R2 can ping R3′s FastEthernet0/0 interface using R1 as the default-gateway.
Lab Instruction
Step
1. – Configure a new Sub-Interface on R1 to match the VLAN 20
(Fa0/0.20) and configure the sub-interface to use 802.1q
encapsulation and the Dot1q tag of 20. Configure the sub-interface to
use the IP address 10.1.20.1/24.
To
create a new sub-interface you’ll use the interface
fa0/0.# command in global configuration mode. To
enable the sub-interface to use 802.1q you’ll use the encapsulation
dot1q # command whereas # is the dot1q VLAN tag as
shown below;
R1 con0 is now available Press RETURN to get started. R1>enable R1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. R1(config)#interface fa0/0 R1(config-if)#no shut R1(config-if)#interface fa0/0.20 R1(config-subif)#encapsulation dot1q 20 R1(config-subif)#ip add 10.1.20.1 255.255.255.0 R1(config-subif)#exit R1(config)#
Step
2. – Configure
a new Sub-Interface on R1 to match the VLAN 30 (Fa0/0.30) and
configure the sub-interface to use 802.1q encapsulation and the Dot1q
tag of 30. Configure the sub-interface to use the IP address
10.1.30.1/24. Verify your sub-interface configuration.
R1(config)#interface fa0/0.30 R1(config-subif)#encapsulation dot1q 30 R1(config-subif)#ip add 10.1.30.1 255.255.255.0 R1(config-subif)#end R1#sh run interface fa0/0.20 Building configuration... Current configuration : 96 bytes ! interface FastEthernet0/0.20 encapsulation dot1Q 20 ip address 10.1.20.1 255.255.255.0 end R1#sh run interface fa0/0.30 Building configuration... Current configuration : 96 bytes ! interface FastEthernet0/0.30 encapsulation dot1Q 30 ip address 10.1.30.1 255.255.255.0 end R1#show ip interface brief | inc FastEthernet0/0 Interface IP-Address OK? Method Status Protocol FastEthernet0/0 unassigned YES unset up up FastEthernet0/0.20 10.1.20.1 YES manual up up FastEthernet0/0.30 10.1.30.1 YES manual up up R1# Step 3. – Disable IP Routing on R2 and R3 and configure the default gateway on R2 and R3 to use R1’s respected Sub-interface as the default gateway.
To
disable IP Routing on R2 and R3 use the no
ip routing command in global
configuration. To specify a default gateway use the ip
default-gateway x.x.x.x as
shown below;
R2 con0 is now available Press RETURN to get started.R2>enable R2#configure terminal Enter configuration commands, one per line. End with CNTL/Z. R2(config)#no ip routing R2(config)#ip default-gateway 10.1.20.1 R2(config)#end R2# R3 con0 is now available Press RETURN to get started. R3>enable R3#configure terminal Enter configuration commands, one per line. End with CNTL/Z. R3(config)#no ip routing R3(config)#ip default-gateway 10.1.30.1 R3(config)#end R3#
Step
4. – Verify
that R2 can ping R3’s FastEthernet0/0 interface using R1 as the
default-gateway as shown below;
R2#ping 10.1.30.3 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 10.1.30.3, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 8/23/52 ms R2#
