OSPF Important Points

OSPF Open Shortest Path First. OSPF is a link-state routing protocol for IP networks. It uses a link-state routing algorithm and falls into the group of interior routing protocols that operates within a single Autonomous System (AS). is a robust routing protocol addressing various link types and deployment scenarios. The Aruba implementation applies to two main use cases; WLAN Wireless Local Area Network. WLAN is a 802.11 standards-based LAN that the users access through a wireless connection. Scenarios and Branch Scenario.

Aruba Mobility Master supports only one OSPF Open Shortest Path First. OSPF is a link-state routing protocol for IP networks. It uses a link-state routing algorithm and falls into the group of interior routing protocols that operates within a single Autonomous System (AS). instance.

Convergence takes between 5 and 15 seconds.

All area types are supported.

Multiple configured areas are supported.

An Aruba Mobility Master can act as an ABR Area Border Router. ABR is used for establishing connection between the backbone networks and the Open Shortest Path First (OSPF) areas. ABR is located near the border of one or more OSPF areas..

OSPF Open Shortest Path First. OSPF is a link-state routing protocol for IP networks. It uses a link-state routing algorithm and falls into the group of interior routing protocols that operates within a single Autonomous System (AS). supports VLAN Virtual Local Area Network. In computer networking, a single Layer 2 network may be partitioned to create multiple distinct broadcast domains, which are mutually isolated so that packets can only pass between them through one or more routers; such a domain is referred to as a Virtual Local Area Network, Virtual LAN, or VLAN. and GRE Generic Routing Encapsulation. GRE is an IP encapsulation protocol that is used to transport packets over a network. tunnel interfaces.

To run OSPF Open Shortest Path First. OSPF is a link-state routing protocol for IP networks. It uses a link-state routing algorithm and falls into the group of interior routing protocols that operates within a single Autonomous System (AS). over IPsec Internet Protocol security. IPsec is a protocol suite for secure IP communications that authenticates and encrypts each IP packet in a communication session. tunnels, a Layer 3 GRE Generic Routing Encapsulation. GRE is an IP encapsulation protocol that is used to transport packets over a network. tunnel is configured between two routers with GRE Generic Routing Encapsulation. GRE is an IP encapsulation protocol that is used to transport packets over a network. destination addresses as the inner address of the IPsec Internet Protocol security. IPsec is a protocol suite for secure IP communications that authenticates and encrypts each IP packet in a communication session. tunnel. OSPF Open Shortest Path First. OSPF is a link-state routing protocol for IP networks. It uses a link-state routing algorithm and falls into the group of interior routing protocols that operates within a single Autonomous System (AS). is enabled on the Layer 3 GRE Generic Routing Encapsulation. GRE is an IP encapsulation protocol that is used to transport packets over a network. tunnel interface, and all of the OSPF Open Shortest Path First. OSPF is a link-state routing protocol for IP networks. It uses a link-state routing algorithm and falls into the group of interior routing protocols that operates within a single Autonomous System (AS). control packets undergo GRE Generic Routing Encapsulation. GRE is an IP encapsulation protocol that is used to transport packets over a network. encapsulation before entering the IPsec Internet Protocol security. IPsec is a protocol suite for secure IP communications that authenticates and encrypts each IP packet in a communication session. tunnels.

The default MTU Maximum Transmission Unit. MTU is the largest size packet or frame specified in octets (eight-bit bytes) that can be sent in networks such as the Internet. value for a Layer 3 GRE Generic Routing Encapsulation. GRE is an IP encapsulation protocol that is used to transport packets over a network. tunnel in an Aruba Mobility Master is 1100. When running OSPF Open Shortest Path First. OSPF is a link-state routing protocol for IP networks. It uses a link-state routing algorithm and falls into the group of interior routing protocols that operates within a single Autonomous System (AS). over a GRE Generic Routing Encapsulation. GRE is an IP encapsulation protocol that is used to transport packets over a network. tunnel between an Aruba Mobility Master and another vendor’s router, the MTU Maximum Transmission Unit. MTU is the largest size packet or frame specified in octets (eight-bit bytes) that can be sent in networks such as the Internet. values must be the same on both sides of the GRE Generic Routing Encapsulation. GRE is an IP encapsulation protocol that is used to transport packets over a network. tunnel.

The following table provides information on the maximum OSPF Open Shortest Path First. OSPF is a link-state routing protocol for IP networks. It uses a link-state routing algorithm and falls into the group of interior routing protocols that operates within a single Autonomous System (AS). routes supported for various platforms:

Table 1: Maximum OSPF Routes
Platform	Branches	Routes
7005	4K	4K
7008	4K	4K
7210	8K	8K
7220	16K	16K
7240	32K	32K

Below are some guidelines regarding deployment and topology for this release of OSPFv2 Open Shortest Path First version 2. OSPFv2 is the version 2 of the link-state routing protocol, OSPF. See RFC 2328..

In the WLAN Wireless Local Area Network. WLAN is a 802.11 standards-based LAN that the users access through a wireless connection. scenario upstream router, configure only the interface connected to the stand-alone controller or the managed device in the same area. This will minimize the number of local subnet Subnet is the logical division of an IP network. addresses advertised by the upstream router to the stand-alone controller or the managed device.

Use the upstream router as the designated router Designated router refers to a router interface that is elected to originate network link advertisements for networks using the OSPF protocol. for the link or interface between the stand-alone controller or the managed device and the upstream router.

The default MTU Maximum Transmission Unit. MTU is the largest size packet or frame specified in octets (eight-bit bytes) that can be sent in networks such as the Internet. value for a Layer 3 GRE Generic Routing Encapsulation. GRE is an IP encapsulation protocol that is used to transport packets over a network. tunnel in an Aruba Mobility Master, managed device or stand-alone controller is 1100. When running OSPF Open Shortest Path First. OSPF is a link-state routing protocol for IP networks. It uses a link-state routing algorithm and falls into the group of interior routing protocols that operates within a single Autonomous System (AS). over a GRE Generic Routing Encapsulation. GRE is an IP encapsulation protocol that is used to transport packets over a network. tunnel between an Aruba device and another vendor’s router, the MTU Maximum Transmission Unit. MTU is the largest size packet or frame specified in octets (eight-bit bytes) that can be sent in networks such as the Internet. values must be the same on both sides of the GRE Generic Routing Encapsulation. GRE is an IP encapsulation protocol that is used to transport packets over a network. tunnel.

Do not enable OSPF Open Shortest Path First. OSPF is a link-state routing protocol for IP networks. It uses a link-state routing algorithm and falls into the group of interior routing protocols that operates within a single Autonomous System (AS). on any uplink or WAN Wide Area Network. WAN is a telecommunications network or computer network that extends over a large geographical distance. interfaces on the managed device. Enable OSPF Open Shortest Path First. OSPF is a link-state routing protocol for IP networks. It uses a link-state routing algorithm and falls into the group of interior routing protocols that operates within a single Autonomous System (AS). only on the Layer 3 GRE Generic Routing Encapsulation. GRE is an IP encapsulation protocol that is used to transport packets over a network. tunnel connecting the Mobility Master.

Use only one physical port in the uplink VLAN Virtual Local Area Network. In computer networking, a single Layer 2 network may be partitioned to create multiple distinct broadcast domains, which are mutually isolated so that packets can only pass between them through one or more routers; such a domain is referred to as a Virtual Local Area Network, Virtual LAN, or VLAN. interface that is connecting to the upstream router. This will prevent broadcasting the protocol PDUs to other ports and hence limit the number of adjacencies on the uplink interface to only one.