GRE Tunnel

Owned by Tracy Yang
Nov 13, 2023
1 min read

In the following topology, the GRE tunnel between Switches A and B needs to be configured. The IP address of the GRE tunnel is 10.10.61.10/24 and 10.10.60.10/24.

 

Figure 4-2. GRE tunnel configuration

Configure Switch-A

In Switch-A, user needs to configure a GRE tunnel and two flows as follows:

root@PicOS-OVS# ovs-vsctl  add-br br0 -- set bridge br0 datapath_type=pica8
root@PicOS-OVS# ovs-vsctl  add-port br0 ge-1/1/1 vlan_mode=trunk tag=1 -- set Interface ge-1/1/1 type=pica8
root@PicOS-OVS# ovs-vsctl  add-port br0 ge-1/1/5 vlan_mode=trunk tag=1 -- set Interface ge-1/1/5 type=pica8
root@PicOS-OVS#
root@PicOS-OVS# ovs-vsctl add-port br0 gre1 -- set Interface gre1 type=pica8_gre options:remote_ip=10.10.60.10 options:local_ip=10.10.61.10 options:vlan=1 options:src_mac=00:11:11:11:11:11 options:dst_mac=00:22:22:22:22:22 options:egress_port=ge-1/1/5
root@PicOS-OVS#
root@PicOS-OVS# ovs-ofctl add-flow br0 in_port=1,actions=output:3073
root@PicOS-OVS# ovs-ofctl add-flow br0 in_port=5,actions=mod_dl_src:00:11:11:11:11:11,mod_dl_dst:00:33:33:33:33:33,output:1

Configure Switch-B

In Switch-A, user also needs to configure a GRE tunnel and two flows as follows:

root@PicOS-OVS# ovs-vsctl  add-br br0 -- set bridge br0 datapath_type=pica8
root@PicOS-OVS# ovs-vsctl  add-port br0 ge-1/1/1 vlan_mode=trunk tag=1 -- set Interface ge-1/1/1 type=pica8
root@PicOS-OVS# ovs-vsctl  add-port br0 ge-1/1/5 vlan_mode=trunk tag=1 -- set Interface ge-1/1/5 type=pica8
root@PicOS-OVS#
root@PicOS-OVS# ovs-vsctl  add-port br0 gre1 -- set Interface gre1 type=pica8_gre options:remote_ip=10.10.61.10 options:local_ip=10.10.60.10 options:vlan=1 options:src_mac=00:22:22:22:22:22 options:dst_mac=00:11:11:11:11:11 options:egress_port=ge-1/1/5
root@PicOS-OVS#
root@PicOS-OVS# ovs-ofctl add-flow br0 in_port=1,actions=output:3073
root@PicOS-OVS# ovs-ofctl add-flow br0 in_port=5,actions=mod_dl_src:00:22:22:22:22:22,mod_dl_dst:00:66:66:66:66:66,output:1

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