Creating two GRE tunnels to different destination addresses
This example creates two GRE tunnels to different destination addresses. Traffic from network 1 can reach either network 2 or network 3 using the appropriate tunnel.
On the 6400 Switch Series, interface identification differs.
Procedure
-
On switch 1:
- Enable interface
1/1/1 and assign the IP address
10.1.1.1/24 to it.
switch# config switch(config)# interface 1/1/1 switch(config-if)# routing switch(config-if)# ip address 10.1.1.1/24 switch(config-if)# no shutdown - Enable interface
1/1/2 and assign the IP address
180.1.10.2/24 to it.
switch# config switch(config)# interface 1/1/2 switch(config-if)# routing switch(config-if)# ip address 180.1.10.2/24 switch(config-if)# no shutdown switch(config-if)# exit - Enable interface
1/1/3 and assign the IP address
30.1.1.1/24 to it.
switch# config switch(config)# interface 1/1/3 switch(config-if)# routing switch(config-if)# 30.1.1.1/24 switch(config-if)# no shutdown switch(config-if)# exit - Create GRE tunnel
10 and assign the IP address
192.168.10.1/24, source address
10.1.1.1, and destination address
20.1.1.1 to it.
switch(config)# interface tunnel 10 mode gre ipv4 switch(config-gre-if)# ip address 192.168.10.1/24 switch(config-gre-if)# source ip 10.1.1.1 switch(config-gre-if)# destination ip 20.1.1.1 switch(config-gre-if)# no shutdown switch(config-gre-if)# exit - Create GRE tunnel
20 and assign the IP address
192.168.20.1/24, source address
30.1.1.1, and destination address
40.1.1.1 to it.
switch(config)# interface tunnel 20 mode gre ipv4 switch(config-gre-if)# ip address 192.168.20.1/24 switch(config-gre-if)# source ip 30.1.1.1 switch(config-gre-if)# destination ip 40.1.1.1 switch(config-gre-if)# no shutdown switch(config-gre-if)# exit - Defines routes so that traffic from network 1 can reach network 2 through tunnel 10.
switch(config)# ip route 20.1.1.0/24 10.1.1.2 switch(config)# ip route 190.1.10.0/24 tunnel10 - Defines routes so that traffic from network 1 can reach network 3 through the tunnel 20.
switch(config)# ip route 40.1.1.0/24 30.1.1.2 switch(config)# ip route 200.1.10.0/24 tunnel20
- Enable interface
1/1/1 and assign the IP address
10.1.1.1/24 to it.
-
On switch 2:
- Enable interface
1/1/1 and assign the IP address
20.1.1.1/24 to it.
switch# config switch(config)# interface 1/1/1 switch(config-if)# routing switch(config-if)# ip address 20.1.1.1/24 switch(config-if)# no shutdown - Enable interface
1/1/2 and assign the IP address
190.1.10.2/24 to it.
switch(config)# interface 1/1/2 switch(config-if)# routing switch(config-if)# ip address 190.1.10.2/24 switch(config-if)# no shutdown switch(config-if)# exit - Create GRE tunnel
10 and assign the IP address
192.168.10.2/24, source address
20.1.1.1, and destination address
10.1.1.1 to it.
switch(config)# interface tunnel 10 mode gre ipv4 switch(config-gre-if)# ip address 192.168.10.2/24 switch(config-gre-if)# source ip 20.1.1.1 switch(config-gre-if)# destination ip 10.1.1.1 switch(config-gre-if)# no shutdown switch(config-gre-if)# exit - Defines routes so that traffic from network 2 can reach network 1 through tunnel 10.
switch(config)# ip route 10.1.1.0/24 20.1.1.2 switch(config)# ip route 180.1.10.0/24 tunnel10
- Enable interface
1/1/1 and assign the IP address
20.1.1.1/24 to it.
-
On switch 3:
- Enable interface
1/1/1 and assign the IP address
40.1.1.1/24 to it.
switch# config switch(config)# interface 1/1/1 switch(config-if)# routing switch(config-if)# ip address 40.1.1.1/24 switch(config-if)# no shutdown - Enable interface
1/1/2 and assign the IP address
200.1.10.2/24 to it.
switch(config)# interface 1/1/2 switch(config-if)# routing switch(config-if)# ip address 200.1.10.2/24 switch(config-if)# no shutdown switch(config-if)# exit - Create GRE tunnel
20 and assign the IP address
192.168.20.2/24, source address
40.1.1.1, and destination address
30.1.1.1 to it.
switch(config)# interface tunnel 10 mode gre ipv4 switch(config-gre-if)# ip address 192.168.20.2/24 switch(config-gre-if)# source ip 40.1.1.1 switch(config-gre-if)# destination ip 30.1.1.1 switch(config-gre-if)# no shutdown switch(config-gre-if)# exit - Defines routes so that traffic from network 3 can reach network 1 through tunnel 20.
switch(config)# ip route 30.1.1.0/24 40.1.1.2 switch(config)# ip route 180.1.10.0/24 tunnel20
- Enable interface
1/1/1 and assign the IP address
40.1.1.1/24 to it.