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Differences between current version and revision by previous author of OSPF.

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Newer page: version 20 Last edited on Sunday, April 22, 2007 5:12:17 pm by LindsayDruett
Older page: version 19 Last edited on Saturday, September 11, 2004 3:22:14 pm by CraigBox Revert
@@ -43,13 +43,15 @@
  ''- Used to define the RID of the router.'' 
  
 Example of configuring the Router ID 
  
+<pre>  
  Router(config)#__interface loopback 0__ 
  Router(config-if)#__ip address 192.168.254.1 255.255.255.0__ 
  Router(config-if)#__!__ 
  Router(config)#__router ospf 100__ 
  Router(config-router)#__router-id 192.168.254.1__ 
+</pre>  
  
 Interface Level Configurations 
  
  Router(config-if)#__ip ospf cost__ ''<cost>'' 
@@ -144,9 +146,9 @@
 **Point-to-Multipoint is a single interface that connects to multiple destinations. The underlying network treats the network as a series of point-to-point circuits. It replicates LSA packets for each circuit. OSPF traffic is sent as multicast. There is no DR or BDR election. This technology uses one IP subnet for all endpoints on the network. 
 *Nonbroadcast Multiaccess Network. 
 **Physically, some point-to-multipoint networks cannot support multicast or broadcast traffic. In an NBMA topology, special configuration is required. NBMA physically resembles a point-to-point line, but in fact, many destinations are possible. WAN clouds, including x.25 and Frame Relay, are examples of this technology. It is recommended that when deploying Frame Relay that sub-interfaces are configured. 
  
-  
+<?plugin OldStyleTable  
 |OSPF over NBMA|__Point-to-Multipoint Nonbroadcast__|__Point-to-point__|__Broadcast__|__NBMA__|__Point-to-Multipoint__ 
 |''Addressing''|Unicast|Multicast|Multicast|Unicast|Multicast 
 |''DR/BDR''|No|No|Yes|Yes (Manual)|No 
 |''Manual Configuration of Neighbors''|Yes|No|No|Yes|No 
@@ -155,9 +157,9 @@
 |''Compliance''|Cisco|Cisco|Cisco|RFC 2328|RFC 2328 
 |''Network Supported''|Star, Partial Mesh|Star, Sub-Interfaces|Full Mesh|Full Mesh|Star, Partial Mesh 
 |''Replicates Packets''|Yes|Yes|Yes|Yes|Yes 
 |''Number of Subnets''|1|Many (1 Per circuit)|1|1|1 
-  
+?>  
  
 ---- 
 !!OSPF in multiple areas 
  
@@ -168,17 +170,20 @@
 *Automonous System Boundary Router (ASBR) 
  
 Common Link-state Advertisemnets (LSA) Types 
  
+<?plugin OldStyleTable  
 |Type 1|Router Link LSA|Intra-area LSA 
 |Type 2|Network Link LSA|Intra-area LSA 
 |Type 3|Network Summary Link LSA|Inter-area LSA 
 |Type 4|AS external ASBR Summary Link LSA|Inter-area LSA 
 |Type 5|External Link LSA|Originated by AS boundary routers 
 |Type 7|Not So Stubby Area external LSA|Summary LSA 
+?>  
 ---- 
 !!OSPF Terms 
  
+<?plugin OldStyleTable  
 |Adjacency|Formed when two neighboring routers have exchanged information and have the same topology table. The databases are synchronized, and they both see the same networks. 
 |Area|A group of routers that share the same area ID. Each router in the area has the same topology table. The area is defined on an interface basis in the configuration of OSPF. 
 |Autonomous System|Routers that share the same routing protocol with the organization. 
 |Backup Designated Router (BDR)|The backup to the Designated Router (DR), in case the DR fails. The BDR performs none of the DR functions while the DR is operating correctly. 
@@ -203,10 +208,10 @@
 |Shortest Path First (SPF)|The same as Dijkstra algorithm, which is the algorithm used to find the shortest path. 
 |SPF Tree|A tree of the topological network. It can be drawn after the SPF algorithm has been run. The algorithm prunes the database of alternate paths and creates a loop-free shortest path to all networks. The router is at the root of the network, which is percieved from its perspective. 
 |Topology Table|The same as a link-state database. the table contains every link in the wider network. 
 |Two-way state|State during the process in which two routers are creating an adjacency. The new router see it's own router ID in the list of neighbors, and a neighbor relationship is established. This is the stage before routing information is exchanged. 
-  
+?>  
  
 ---- 
 [OSPFvsISIS] 
 %%% 
 CategoryNetworking