OSPF is a routing protocol for Internet Protocol networks. It uses a link state routing algorithm and falls into the group of interior routing protocols, operating within a single autonomous system. Compared with RIP, OSPF can provide scalable network support and faster convergence times. OSPF is widely used in large networks such as ISP backbones and enterprise networks. Considering that in large organizations where the end-to-end access is a requirement, the current VPC model brings more complexity to management and hands-on configuration beside the overhead involved in the NAT address translations processing. This presentation will bring some possibles approaches to enable dynamic routing using the OSPF protocol for IPv4 and IPv6 and simplify the network administrator life safely and quickly.

1. OSPF protocol in CloudStack
Marco Sinhoreli
Consultant Manager
marco.sinhoreli@shapeblue.com
Twitter: @msinhore

2. @shapeblue #ccceu14
 Consultant Manager at ShapeBlue
 Specialise in….
 Designing and deploying enterprise and
public clouds
 CloudStack Brazil Community Chairman
 Designed Clouds USP, Globo.com and many
others in Brazil
 CloudStack Committer
 Director of CSA Brazil Chapter
About Me
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3. @shapeblue #ccceu14
 About ShapeBlue
 Introduction to the OSPF Protocol
 How it works?
 Network Design
 The routing software suite Quagga
 Then… why integrate a dynamic routing protocol?
 Scope
 Use Case
 UI Workflow
 References
OSPF protocol on CloudStack
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“ShapeBlue are expert builders of public &
private clouds. They are the leading global
Apache CloudStack
integrator & consultancy”
…and we’re hiring!
About ShapeBlue
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 OSPF – Open Shortest Path First
 Routing protocol for Internet (IP) protocol networks
 IPG (Interior Gateway Protocol) and falls into the group of interior
routing protocols
 Uses a link state routing algorithm
 Uses a single Anonymous System (AS)
 OSPFv2 referenced in RFC2328 for IPv4
 OSPFv3 referenced in RFC5340 for IPv6
Introduction to the OSPF Protocol
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OSPF Area 1
How OSPF works?
Routing table:
192.168.0.0/24 local
192.168.1.0/24 via R2
192.168.2.0/24 via R3
Routing table:
192.168.1.0/24 local
192.168.0.0/24 via R1
192.168.2.0/25 via R3
Routing table:
192.168.2.0/24 local
192.168.0.0/24 via R1
192.168.1.0/24 via R2
R1
R3 R2
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Quagga
 Fork of GNU Zebra
 Supports all popular Linux distributions and Unix derivatives
 Supports protocols such as RIPv1, RIPv2, RIPng, OSPFv2, OSPFv3, IS-IS,
BGP-4, and BGP-4+
 Quagga is a collection of several daemons that work together to build
the routing table
 A system with Quagga installed acts as a dedicated router
 Exchanges routing information with other routers using routing
protocols
 Uses this information to update the kernel routing
 Changes dynamically the configuration
 The user may view routing table information from the Quagga CLI
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Quagga Architecture
OSPFD BGPD RIPD Zebra
Unix Kernel routing table
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 Config files are generally found in:
 /etc/quagga/*.conf
 Each of the daemons has its own config file. For example,
OSPFv2’s default config file name is:
 /etc/quagga/ospfd.conf
Quagga setup
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interface eth0
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 ospf
router ospf
ospf router-id 200.0.0.11
log-adjacency-changes
redistribute connected
passive-interface default
no passive-interface eth0
network 200.0.0.0/24 area 0.0.0.0
area 0.0.0.0 authentication message-digest
ospfd.conf example
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 Support to the OSPF Version 2 protocol to announce IPv4 routes using
Quagga routing software (daemon ospfd)
 Support to the OSPF Version 3 protocol to announce IPv6 routes using
Quagga routing software (daemon ospf6d)
 Create a specific network offering to support the OSPF protocol in the VPC-VR
 Enable routing to guest networks behind VPC-VR without NATing
 Support to the services:
 DHCP
 DNS
 Network ACL (iptables, ip6tables)
 Load Balancing (HAproxy)
 Password reset
Scope
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Use case
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Workflow
Admin user:
Users:
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UI mock (Admin User)
1 – Configure the Public
Network for OSPF Transit
Area
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UI mock (Admin User)
2 – Add Super-CIDRs that
will be associated to Guest
OSPF VPCs Networks
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UI mock (Admin User)
3 – Add a new VPC
Network Offering with
OSPF dynamic routing
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UI mock (Users)
1 – Add a new VPC Routed
Network
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 http://www.nongnu.org/quagga/
 https://tools.ietf.org/html/rfc2328
 https://tools.ietf.org/html/rfc5340
 https://tools.ietf.org/html/rfc3531
 https://tools.ietf.org/html/rfc2460
 https://cwiki.apache.org/confluence/display/CLOUDSTACK/IPv6+in+VPC+Route
r
 http://en.wikipedia.org/wiki/Open_Shortest_Path_First
References
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Questions?
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21. OSPF protocol in CloudStack
Marco Sinhoreli
Consultant Manager
marco.sinhoreli@shapeblue.com
Twitter: @msinhore