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Features of OSPF

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  •  Classless      
  •   Efficient        
  •  Fast convergence         
  •    Scalable 
  •    Secure - 
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Classless - OSPFv2 is classless by design; therefore, it supports IPv4 VLSM and CIDR.

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Classless - OSPFv2 is classless by design; therefore, it supports IPv4 VLSM and CIDR.

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Efficient - Routing changes trigger routing updates (no periodic updates). It uses the SPF algorithm to choose the best path.

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Efficient - Routing changes trigger routing updates (no periodic updates). It uses the SPF algorithm to choose the best path.

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Fast convergence - It quickly propagates network changes.

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Fast convergence - It quickly propagates network changes.

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Scalable - It works well in small and large network sizes. Routers can be grouped into areas to support a hierarchical system.

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Scalable - It works well in small and large network sizes. Routers can be grouped into areas to support a hierarchical system.

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Note>

Administrative distance (AD) is the trustworthiness (or preference) of the route source. OSPF has a default administrative distance of 110. As shown in Figure 2, OSPF has a lower number (making it a preferred routing protocol over IS-IS and RIP) on Cisco devices.

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TESTE DEIN WISSEN

Administrative distance (AD) is the trustworthiness (or preference) of the route source. OSPF has a default administrative distance of 110. As shown in Figure 2, OSPF has a lower number (making it a preferred routing protocol over IS-IS and RIP) on Cisco devices.

Lösung ausblenden
TESTE DEIN WISSEN

Components of OSPF

The three main components of the OSPF routing protocol include:

  •  Data Structures   
  •  Routing Protocol Messages   
  •   Algorithm                        
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TESTE DEIN WISSEN

Components of OSPF

The three main components of the OSPF routing protocol include:

  •  Data Structures   
  •  Routing Protocol Messages   
  •   Algorithm
Lösung ausblenden
TESTE DEIN WISSEN

           Data Structures          

OSPF creates and maintains three databases:                    

  • Adjacency database - Creates the neighbor table.    
  •  Link-state database (LSDB) - Creates the topology table.       
  •  Forwarding database - Creates the routing table.
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           Data Structures          

OSPF creates and maintains three databases:                    

  • Adjacency database - Creates the neighbor table.    
  •  Link-state database (LSDB) - Creates the topology table.       
  •  Forwarding database - Creates the routing table.
Lösung ausblenden
TESTE DEIN WISSEN

Link-State Operation

1. Establish Neighbor Adjacencies 

An OSPF-enabled router sends Hello packets out all OSPF-enabled interfaces.

2. Exchange Link-State Advertisements After adjacencies are established, routers then exchange link-state advertisements (LSAs).

3.Build the Topology Table OSPF-enabled routers build the topology table (LSDB) based on the received LSAs.

4. Execute the SPF Algorithm Routers then execute the SPF algorithm. The gears in the figure are used to indicate the execution of the SPF algorithm. The SPF algorithm creates the SPF tree.

Lösung anzeigen
TESTE DEIN WISSEN

Link-State Operation

1. Establish Neighbor Adjacencies 

An OSPF-enabled router sends Hello packets out all OSPF-enabled interfaces.

2. Exchange Link-State Advertisements After adjacencies are established, routers then exchange link-state advertisements (LSAs).

3.Build the Topology Table OSPF-enabled routers build the topology table (LSDB) based on the received LSAs.

4. Execute the SPF Algorithm Routers then execute the SPF algorithm. The gears in the figure are used to indicate the execution of the SPF algorithm. The SPF algorithm creates the SPF tree.

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TESTE DEIN WISSEN

OSPF area is a group of routers that share the same link-state information in their LSDBs.

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OSPF area is a group of routers that share the same link-state information in their LSDBs.

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OSPF can be implemented in one of two ways:

Single-Area OSPF - In , all routers are in one area called the backbone area (area 0).      

  Multiarea OSPF ,OSPF is implemented using multiple areas, in a hierarchal fashion. All areas must connect to the backbone area (area 0). Routers interconnecting the areas are referred to as Area Border Routers (ABRs).

Lösung anzeigen
TESTE DEIN WISSEN

OSPF can be implemented in one of two ways:

Single-Area OSPF - In , all routers are in one area called the backbone area (area 0).      

  Multiarea OSPF ,OSPF is implemented using multiple areas, in a hierarchal fashion. All areas must connect to the backbone area (area 0). Routers interconnecting the areas are referred to as Area Border Routers (ABRs). 

Lösung ausblenden
TESTE DEIN WISSEN

Note: Routers in other areas receive messages regarding topology changes, but these routers only update the routing table, not rerun the SPF algorithm.

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Note: Routers in other areas receive messages regarding topology changes, but these routers only update the routing table, not rerun the SPF algorithm.

Lösung ausblenden
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Q:

Features of OSPF

A:
  •  Classless      
  •   Efficient        
  •  Fast convergence         
  •    Scalable 
  •    Secure - 
Q:

Classless - OSPFv2 is classless by design; therefore, it supports IPv4 VLSM and CIDR.

A:

Classless - OSPFv2 is classless by design; therefore, it supports IPv4 VLSM and CIDR.

Q:

Efficient - Routing changes trigger routing updates (no periodic updates). It uses the SPF algorithm to choose the best path.

A:

Efficient - Routing changes trigger routing updates (no periodic updates). It uses the SPF algorithm to choose the best path.

Q:

Fast convergence - It quickly propagates network changes.

A:

Fast convergence - It quickly propagates network changes.

Q:

Scalable - It works well in small and large network sizes. Routers can be grouped into areas to support a hierarchical system.

A:

Scalable - It works well in small and large network sizes. Routers can be grouped into areas to support a hierarchical system.

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Q:

Note>

Administrative distance (AD) is the trustworthiness (or preference) of the route source. OSPF has a default administrative distance of 110. As shown in Figure 2, OSPF has a lower number (making it a preferred routing protocol over IS-IS and RIP) on Cisco devices.

A:

Administrative distance (AD) is the trustworthiness (or preference) of the route source. OSPF has a default administrative distance of 110. As shown in Figure 2, OSPF has a lower number (making it a preferred routing protocol over IS-IS and RIP) on Cisco devices.

Q:

Components of OSPF

The three main components of the OSPF routing protocol include:

  •  Data Structures   
  •  Routing Protocol Messages   
  •   Algorithm                        
A:

Components of OSPF

The three main components of the OSPF routing protocol include:

  •  Data Structures   
  •  Routing Protocol Messages   
  •   Algorithm
Q:

           Data Structures          

OSPF creates and maintains three databases:                    

  • Adjacency database - Creates the neighbor table.    
  •  Link-state database (LSDB) - Creates the topology table.       
  •  Forwarding database - Creates the routing table.
A:

           Data Structures          

OSPF creates and maintains three databases:                    

  • Adjacency database - Creates the neighbor table.    
  •  Link-state database (LSDB) - Creates the topology table.       
  •  Forwarding database - Creates the routing table.
Q:

Link-State Operation

1. Establish Neighbor Adjacencies 

An OSPF-enabled router sends Hello packets out all OSPF-enabled interfaces.

2. Exchange Link-State Advertisements After adjacencies are established, routers then exchange link-state advertisements (LSAs).

3.Build the Topology Table OSPF-enabled routers build the topology table (LSDB) based on the received LSAs.

4. Execute the SPF Algorithm Routers then execute the SPF algorithm. The gears in the figure are used to indicate the execution of the SPF algorithm. The SPF algorithm creates the SPF tree.

A:

Link-State Operation

1. Establish Neighbor Adjacencies 

An OSPF-enabled router sends Hello packets out all OSPF-enabled interfaces.

2. Exchange Link-State Advertisements After adjacencies are established, routers then exchange link-state advertisements (LSAs).

3.Build the Topology Table OSPF-enabled routers build the topology table (LSDB) based on the received LSAs.

4. Execute the SPF Algorithm Routers then execute the SPF algorithm. The gears in the figure are used to indicate the execution of the SPF algorithm. The SPF algorithm creates the SPF tree.

Q:

OSPF area is a group of routers that share the same link-state information in their LSDBs.

A:

OSPF area is a group of routers that share the same link-state information in their LSDBs.

Q:

OSPF can be implemented in one of two ways:

Single-Area OSPF - In , all routers are in one area called the backbone area (area 0).      

  Multiarea OSPF ,OSPF is implemented using multiple areas, in a hierarchal fashion. All areas must connect to the backbone area (area 0). Routers interconnecting the areas are referred to as Area Border Routers (ABRs).

A:

OSPF can be implemented in one of two ways:

Single-Area OSPF - In , all routers are in one area called the backbone area (area 0).      

  Multiarea OSPF ,OSPF is implemented using multiple areas, in a hierarchal fashion. All areas must connect to the backbone area (area 0). Routers interconnecting the areas are referred to as Area Border Routers (ABRs). 

Q:

Note: Routers in other areas receive messages regarding topology changes, but these routers only update the routing table, not rerun the SPF algorithm.

A:

Note: Routers in other areas receive messages regarding topology changes, but these routers only update the routing table, not rerun the SPF algorithm.

Chapter 8 OSPF

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