Three-layer switching for VLAN interoperability

Three-layer switching technology: two-layer switching technology + three-layer forwarding technology. It solves the network segment in the LAN, the network segment must rely on the router to manage the situation, to solve the traditional router low speed, complexity caused by the bottleneck problem.

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Lab Requirements:

• C1 and C4 belong to VLAN10,C2, C3 belong to VLAN20;

• Three-layer switching to achieve inter-PC interoperability;

• R2 Configure static routing to realize the whole network interworking;

Experimental steps:

in the lab: Cisco GNS3

1.SW1 Configuration

Sw1#confi t//Enter global configuration mode;

Enter configuration commands, one per line. End with cntl/z.

SW1 (config) #vlan 10,20//bulk add VLAN;

SW1 (Config-vlan) #exit

SW1 (config) #int F1/1//Enter the physical interface FA1/1;

SW1 (config-if) #switchport access VLAN 10//Add VLAN10;

SW1 (config-if) #no shut//activation port;

SW1 (config) #int f1/2//Enter the interface fa1/2;

SW1 (config-if) #switchport access VLAN 20//Add VLAN20;

SW1 (config-if) #no shut//activation port;

SW1 (config) #int F1/5//Enter the interface FA1/5;

SW1 (config-if) #switchport mode trunk//trunk trunk port;

SW1 (config-if) #

*mar 1 00:35:23.195:%dtp-5-trunkporton:port FA1/5 has become dot1q trunk

SW1 (config) #int f1/0//Enter the interface fa1/0;

SW1 (config-if) #switchport mode trunk//trunk trunk port;

SW1 (config-if) #

*mar 1 00:39:33.223:%dtp-5-trunkporton:port fa1/0 has become dot1q trunk

2. SW2 Configuration

SW2#CONFI t//global configuration mode

Enter configuration commands, one per line. End with cntl/z.

SW2 (config) #vlan 10,20//bulk add VLAN;

SW2 (Config-vlan) #exit

SW2 (config) #int F1/3//inlet interface FA1/3;

SW2 (config-if) #switchport access VLAN 20//Add VLAN20;

SW2 (config-if) #no shut//activation port;

SW2 (config) #int F1/5//inlet FA1/5 Port;

SW2 (config-if) #switchport mode trunk//configuration trunk port;

SW2 (config-if) #

*mar 1 00:36:20.659:%dtp-5-trunkporton:port FA1/5 has become dot1q trunk

3.M1 Configuration

M1#CONFI t//global configuration mode;

Enter configuration commands, one per line. End with cntl/z.

M1 (config) #int f1/0//inlet interface fa1/0;

M1 (config-if) #switchport mode trunk//configuration trunk trunk;

M1 (config-if) #

*mar 1 00:41:48.443:%dtp-5-trunkporton:port fa1/0 has become dot1q trunk

M1 (config-if) #exit

M1 (config) #vlan 10,20//bulk add VLAN;

M1 (Config-vlan) #exit

M1 (config) #int F1/4//inlet interface FA1/4;

M1 (config-if) #switchport access VLAN 10//Add VLAN10;

M1 (config) #int vlan10//Enter VLAN10 virtual interface;

*mar 1 00:44:50.479:%lineproto-5-updown:line protocol on Interface Vlan10, changed

M1 (config-if) #ip addr 192.168.1.1 255.255.255.0//configure gateway IP address;

M1 (config-if) #int vlan20//Enter VLAN20 virtual interface;

*mar 1 00:45:24.131:%lineproto-5-updown:line protocol on Interface Vlan20, changed

M1 (config-if) #ip addr 192.168.2.1 255.255.255.0//configure gateway IP address;

M1 (config) #int F1/10//inlet interface FA1/10;

M1 (config-if) #no switchport//Two-layer port to three-layer port;

M1 (config-if) #ip add 10.0.0.1 255.255.255.0//Configure IP address;

M1 (config-if) #

*mar 1 00:54:19.367:%lineproto-5-updown:line protocol on Interface FASTETHERNET1/10, changed

M1 (config-if) #no shut//port activation;

M1 (config) #ip Route 0.0.0.0 0.0.0.0 10.0.0.2//configure default static routes;

4.PC Configuration

vpcs[1]> IP 192.168.1.10 192.168.1.1//configuration C1 IP address and gateway;

Checking for duplicate Address ...

pc1:192.168.1.10 255.255.255.0 Gateway 192.168.1.1

Vpcs[1]> 2

vpcs[2]> IP 192.168.2.20 192.168.2.1//configuration C2 IP address and gateway;

Checking for duplicate Address ...

pc2:192.168.2.20 255.255.255.0 Gateway 192.168.2.1

Vpcs[2]> 3

vpcs[3]> IP 192.168.2.30 192.168.2.1//configuration C3 IP address and gateway;

Checking for duplicate Address ...

pc3:192.168.2.30 255.255.255.0 Gateway 192.168.2.1

Vpcs[3]> 4

vpcs[4]> IP 192.168.1.40 192.168.1.1//configuration C4 IP address and gateway;

Checking for duplicate Address ...

pc4:192.168.1.40 255.255.255.0 Gateway 192.168.1.1

5. Test communication between PCs

vpcs[4]> Ping 192.168.1.10//test C1 and C4 connectivity;

192.168.1.10 icmp_seq=1 ttl=64 time=2.002 ms

192.168.1.10 icmp_seq=2 ttl=64 time=2.967 ms

192.168.1.10 icmp_seq=3 ttl=64 time=2.003 ms

192.168.1.10 icmp_seq=4 ttl=64 time=3.008 ms

192.168.1.10 icmp_seq=5 ttl=64 time=2.003 ms

Vpcs[4]> 3

vpcs[3]> Ping 192.168.2.20//test C3, C2 connectivity;

192.168.2.20 icmp_seq=1 ttl=64 time=3.004 ms

192.168.2.20 icmp_seq=2 ttl=64 time=2.069 ms

vpcs[3]> Ping 192.168.1.10//test C3, C1 connectivity;

192.168.1.10 icmp_seq=1 Timeout

192.168.1.10 icmp_seq=2 ttl=63 time=17.949 ms

192.168.1.10 icmp_seq=3 ttl=63 time=17.967 ms

192.168.1.10 icmp_seq=4 ttl=63 time=55.063 ms

192.168.1.10 icmp_seq=5 ttl=63 time=28.966 ms

Vpcs[3]>

Vpcs[3]> 4

vpcs[4]> Ping 192.168.2.20//test C4, C2 connectivity;

192.168.2.20 icmp_seq=1 Timeout

192.168.2.20 icmp_seq=2 ttl=63 time=47.050 ms

192.168.2.20 icmp_seq=3 ttl=63 time=23.026 ms

6.R1 Configuration

R1#CONFI t//global configuration mode;

Enter configuration commands, one per line. End with cntl/z.

R1 (config) #int F0/1//inlet FA0/1 interface;

R1 (config-if) #ip add 10.0.0.2 255.255.255.0//Configure IP address and subnet mask;

R1 (config-if) #no shut//activation port;

R1 (config-if) #

*mar 1 00:55:56.307:%link-3-updown:interface FASTETHERNET0/1, changed state-to-up

*mar 1 00:55:57.307:%lineproto-5-updown:line protocol on Interface FASTETHERNET0/1, changed

R1 (config) #int f0/0//Enter the interface fa0/0;

R1 (config-if) #ip add 12.0.0.2 255.255.255.0//Configure IP address, subnet mask;

R1 (config-if) #no shut//activation port;

R1 (config-if) #

*mar 1 00:58:54.163:%link-3-updown:interface fastethernet0/0, changed state-to-up

*mar 1 00:58:55.163:%lineproto-5-updown:line protocol on Interface fastethernet0/0, changed

R1 (config) #ip Route 192.168.1.0 255.255.255.0 10.0.0.1//configure default static routes;

R1 (config) #ip Route 192.168.2.0 255.255.255.0 10.0.0.1

7.R2 Configuration

R2#CONFI t//global configuration mode;

Enter configuration commands, one per line. End with cntl/z.

R2 (config) #int f0/0//Enter f0/0 interface;

R2 (config-if) #ip add 12.0.0.3 255.255.255.0//Configure IP address and subnet mask;

R2 (config-if) #no shut//activation port;

R2 (config-if) #

*mar 1 01:00:11.707:%link-3-updown:interface fastethernet0/0, changed state-to-up

*mar 1 01:00:12.707:%lineproto-5-updown:line protocol on Interface fastethernet0/0, changed

R2 (config) #ip Route 0.0.0.0 0.0.0.0 12.0.0.2//configure static routes;

8. Testing Interoperability

vpcs[3]> Ping 12.0.0.3//test C3, R2 connectivity;

12.0.0.3 icmp_seq=1 ttl=253 time=137.756 ms

12.0.0.3 icmp_seq=2 ttl=253 time=93.753 ms

12.0.0.3 icmp_seq=3 ttl=253 time=109.381 ms

12.0.0.3 icmp_seq=4 ttl=253 time=140.631 ms

12.0.0.3 icmp_seq=5 ttl=253 time=140.633 ms

Vpcs[3]> 1

vpcs[1]> Ping 12.0.0.2//test C1, R1 connectivity;

12.0.0.2 icmp_seq=1 ttl=254 time=62.501 ms

12.0.0.2 icmp_seq=2 ttl=254 time=93.764 ms

12.0.0.2 icmp_seq=3 ttl=254 time=78.126 ms

12.0.0.2 icmp_seq=4 ttl=254 time=78.126 ms

12.0.0.2 icmp_seq=5 ttl=254 time=93.756 ms

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Three-layer switching for VLAN interoperability