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CCNP BSCI Notes – Understanding Simple Single-Area OSPF
Thursday, November 19th, 2009OSPF Fundamentals
Link-state routing protocols utilize more internal resources in favor of reducing bandwidth consumption.
All OSPF routers in an area share the same Link State Database (LSDB).
Link State Advertisements (LSAs) are flooded to all neighboring routers.
OSPF tables:
Tags: BSCI Notes, OSPF
CCNP BSCI(642-901) Quick Learning
Thursday, October 22nd, 2009The following Quick Learning Modules are focused on a specific lesson or topic from the current BSCI curriculum.
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Introducing the OSPF Protocol
Upon completing this lesson, you should be able to:
Tags: 642-901, [...]
OSPF Convergence
Monday, August 24th, 2009Resiliency and redundancy to circuit failure is provided by the convergence capabilities of OSPF at layer 3.
There are two components to OSPF routing convergence: detection of topology changes and recalculation of routes.
Detection of topology changes is supported in two ways by OSPF. The first, and quickest, is a failure or change of status on the [...]
OSPF – Things to Remember
Monday, August 3rd, 20091. The IP header of an OSPF packet specifies protocol number 89.
2. To establish OSPF neighbor adjacency, hello/dead timers, MTU (otherwise have to use "ip ospf mtu-ignore") must match. Unique router-id is also required.
3. Routers in stub area can only be adjacent with the routers in stubs or totally stubby area. Routers in NSSA can [...]
R&S Quick Notes – IGP’s
Friday, June 12th, 2009RIP
Know your filters: Offset-list, Distribute-lists, distance command.
With filters read carefully: “between 25 & 45″ or “from 25 to 45″.
Know your prefix-lists or alternatively using ACL’s instead.
“passive interface” command, ONLY stops the sending of updates out the interface. Interface will still receive and process those updates. Passive interfaces will still be advertised in [...]
Configuring and Verifying the OSPF
Thursday, April 23rd, 2009There are a few simple commands that are used to configure and troubleshoot a Cisco router configured to use OSPF in a single area and in a multiple area network. The commands used to configure OSPF are:
. router ospf < process_number > where process_number is a number local to the router. This command configures OSPF [...]
CCNP BSCI(642-901) Lab – OSPF
Tuesday, April 14th, 2009OSPF is configure on routers Amaniya and Lynaic. Amaniya’s S0/0 interface and Lynaic’s S0/1 interface are in Area 0. Lynaic’s Loopback0 interface is in Area 2.
Your task is to configure the following:
Pass4sure’s S0/0 interface in Area 1
Amaniya’s S0/1 interface in Area 1
Use the appropriate mask such that ONLY Pass4sure’s S0/0 and Amaniya’s S0/1 could be [...]
CCNP BSCI(642-901) Lab – IPv6 OSPF Virtual Link
Tuesday, April 14th, 2009Acme is a small export company that has an existing enterprise network that is runing IPV6 OSPFv3. Currently OSPF is configured on all routers.However, P4S-R4’s loopback address (FEC0:4:4) cannot be seen in P4S-R1’s IPv6 routin table.You are tasked with identifying the cause of this fault and implementing the needed corrective actions that uses OSPF features [...]