Hi All

I am working on openstack Heat and i wanted to make below attached topology using heat template :

Router 1

    |
    |

Subnet 1

    |
    |

Network 1

! ! ! ! ! ! ! ! ! vm1 vm1 vm1

Router 2

    |
    |

Subnet 2

    |
    |

Network 2

! ! ! ! ! ! ! ! ! vm2 vm2 vm2

The topology have two routers having different subnets having diferent networks and instances is attached to their respective networks. I cannot figure out how can i connect two routers as even on internet i didnot get any example template having multiple routers topology?

I want to connect both the routers and have link between both the routers.

So i make two subnets each for a network and assigned interface on both routers, such that one interface on each have same router but different subnets. Example :

heat_router_int0:
    Properties:
      router_id: {Ref: heat_router_01}
      subnet_id: {Ref: heat_subnet_01}

heat_router_int2:
    Properties:
      router_id: {Ref: heat_router_01}
      subnet_id: {Ref: heat_subnet_02}

The template which i am using is given below :

AWSTemplateFormatVersion: '2010-09-09'
Description: Sample Heat template that spins up multiple instances and a private network
  (JSON)
Resources:
  heat_network_01:
    Properties: {name: heat-network-01}
    Type: OS::Neutron::Net
  heat_network_02:
    Properties: {name: heat-network-02}
    Type: OS::Neutron::Net
  heat_router_01:
    Properties: {admin_state_up: 'True', name: heat-router-01}
    Type: OS::Neutron::Router
  heat_router_02:
    Properties: {admin_state_up: 'True', name: heat-router-02}
    Type: OS::Neutron::Router
  heat_router_int0:
    Properties:
      router_id: {Ref: heat_router_01}
      subnet_id: {Ref: heat_subnet_01}
    Type: OS::Neutron::RouterInterface
  heat_router_int1:
    Properties:
      router_id: {Ref: heat_router_02}
      subnet_id: {Ref: heat_subnet_02}
    Type: OS::Neutron::RouterInterface
  heat_router_int2:
    Properties:
      router_id: {Ref: heat_router_01}
      subnet_id: {Ref: heat_subnet_02}
    Type: OS::Neutron::RouterInterface
  heat_router_int3:
    Properties:
      router_id: {Ref: heat_router_02}
      subnet_id: {Ref: heat_subnet_01}
    Type: OS::Neutron::RouterInterface
  heat_subnet_01:
    Properties:
      cidr: 10.10.10.0/24
      dns_nameservers: [172.16.1.11, 172.16.1.6]
      enable_dhcp: 'True'
      gateway_ip: 10.10.10.254
      name: heat-subnet-01
      network_id: {Ref: heat_network_01}
    Type: OS::Neutron::Subnet
  heat_subnet_02:
    Properties:
      cidr: 10.10.11.0/24
      dns_nameservers: [172.16.1.11, 172.16.1.6]
      enable_dhcp: 'True'
      gateway_ip: 10.10.11.254
      name: heat-subnet-01
      network_id: {Ref: heat_network_02}
    Type: OS::Neutron::Subnet
  instance0:
    Properties:
      flavor: m1.nano
      image: cirros-0.3.2-x86_64-uec
      name: heat-instance-01
      networks:
      - port: {Ref: instance0_port0}
    Type: OS::Nova::Server
  instance0_port0:
    Properties:
      admin_state_up: 'True'
      network_id: {Ref: heat_network_01}
    Type: OS::Neutron::Port
  instance1:
    Properties:
      flavor: m1.nano
      image: cirros-0.3.2-x86_64-uec
      name: heat-instance12-02
      networks:
      - port: {Ref: instance12_port0}
    Type: OS::Nova::Server
  instance11:
    Properties:
      flavor: m1.nano
      image: cirros-0.3.2-x86_64-uec
      name: heat-instance11-01
      networks:
      - port: {Ref: instance11_port0}
    Type: OS::Nova::Server
  instance11_port0:
    Properties:
      admin_state_up: 'True'
      network_id: {Ref: heat_network_02}
    Type: OS::Neutron::Port
  instance12_port0:
    Properties:
      admin_state_up: 'True'
      network_id: {Ref: heat_network_02}
    Type: OS::Neutron::Port
  instance1_port0:
    Properties:
      admin_state_up: 'True'
      network_id: {Ref: heat_network_01}
    Type: OS::Neutron::Port

I am able to create topology using the template but i am not able to connect two routers.

The error is shown in heat_router_int0 :

Create FailedResource Create Failed: Ipaddressinuseclient: Unable To Complete Operation For Network 2870ec2e-5b89-43b2-9f9f-396cad53ed49. The Ip Address 10.10.10.254 Is In Use.

Neither i can get a template example on internet through which i can connect two routers. Can you please help me with :

1.) Can we connect two routers? Does the configuration :

heat_router_int2:
    Properties:
      router_id: {Ref: heat_router_01}
      subnet_id: {Ref: heat_subnet_02 ...