Quick Answer: What Is The Default Cost Of A Serial Interface With OSPF?

What is the default cost of OSPF?

Default values: 100 Mbps—The default cost is 5..

What is the default OSPF interface cost of a wireless link?

Default cost of essential interfaces.Interface TypebandwidthCostEthernet Link10Mbps10FastEthernet Link100Mbps1Serial Link1544Kbps(default)64Aug 6, 2018

What is the default cost value on Cisco router?

The default cost of an Fast Ethernet interface is 1 by the formula 10(8)/Bandwidth (of an interface). The route 2.2. 2.2 is known via the FastEthernet 1/0.

How does OSPF determine learned routes?

Use the show ospf routes command to display the OSPF private routing table (which contains only routes that are calculated by OSPF). If something is wrong with a route in the routing information base (RIB), then you should check the OSPF copy of the route to determine if it matches the RIB contents.

What is Eigrp metric?

EIGRP Metric = 256*(Bandwidth + Delay) Bandwidth = 10000000/bandwidth(i), where bandwidth(i) is the least bandwidth of all outgoing interfaces on the route to the destination network represented in kilobits.

What is default information originate?

default-information originate (OSPF) To generate a default external route into an Open Shortest Path First (OSPF) routing domain, use the default-information originate command. To disable this feature, use the no form of this command.

What are two reasons that will prevent two routers from forming an OSPFv2 adjacency choose two?

What are two reasons that will prevent two routers from forming an OSPFv2 adjacency? ( Choose two.)a mismatched Cisco IOS version that is used.mismatched OSPF Hello or Dead timers.mismatched subnet masks on the link interfaces.use of private IP addresses on the link interfaces.More items…•

How does OSPF determine route cost?

Open Shortest Path First (OSPF) uses “Cost” as the value of metric and uses a Reference Bandwidth of 100 Mbps for cost calculation. The formula to calculate the cost is Reference Bandwidth divided by interface bandwidth. For example, in the case of 10 Mbps Ethernet , OSPF Metric Cost value is 100 Mbps / 10 Mbps = 10.

What is the default ad cost of OSPF in a router?

100 / 1.544With the default of 100 Mbps, and default bandwidth, a serial interface’s default OSPF cost is 100 / 1.544, or 64 (rounded down). Method 2 in this post changes the reference bandwidth, and leaves Fa0/0’s interface bandwidth at 100 Mbps.

How do I change OSPF cost?

Enter configuration commands, one per line. End with CNTL/Z. The other way of affecting the cost of an interface is through the “ip ospf cost” command on the interface itself, this will override the calculated cost. You can also set the cost per neighbor using the “neighbor (neighbor-ip) cost value” command.

What metric does RIP use?

What metric does RIP use? How is the metric used to indicate an unreachable network? RIP uses a hop count metric. An unreachable network is indicated by setting the hop count to 16, which RIP interprets as an infinite distance.

What is OSPF priority?

Sets the priority of a router to determine the designated OSPF router for a network. A router whose priority is set to 0 is ineligible to become designated router or backup designated router. … Use the ip ospf priority [1 – 255] command to set the priority to a value between 1 and 255.

What is OSPF router ID?

The OSPF Router ID is used to provide a unique identity to the OSPF Router. OSPF Router ID is an IPv4 address (32-bit binary number) assigned to each router running the OSPF protocol. … If there is no Loopback Interfaces configured, the highest IP address on its active interfaces is selected as the OSPF Router ID.

Why would you want to change the OSPF default reference bandwidth?

Why would you want to change the OSPF default reference-bandwidth? You would change the OSPF default reference-bandwidth to make a route have more or less cost.

How do I enable OSPF on my router?

To enable OSPF on a Cisco router and advertise interfaces, the following tasks are required:Use the command router ospf process ID to start OSPF.Use the network command to enable the interfaces.Identify area assignments.(Optional) Assign the router ID.

Does OSPF support load balancing?

If equal-cost paths exist to the same destination, the Cisco implementation of OSPF can keep track of up to 16 next hops to the same destination in the routing table (which is called load balancing). By default, the Cisco router supports up to four equal-cost paths to a destination for OSPF.

How do I find my LSA type in OSPF?

By using the show ip ospf database we can look at the LSDB and we can see the type 1 router LSAs, type 2 network LSAs and the type 3 summary LSAs here.

What algorithm does OSPF use?

Open Shortest Path First (OSPF) is a routing protocol for Internet Protocol (IP) networks. It uses a link state routing (LSR) algorithm and falls into the group of interior gateway protocols (IGPs), operating within a single autonomous system (AS). It is defined as OSPF Version 2 in RFC 2328 (1998) for IPv4.

What is OSPF instance?

A routing instance is a collection of routing tables, interfaces, and routing protocol parameters. … You can further install routes learned from OSPF routing instances into routing tables in the OSPF routing table group.

What is IP OSPF cost?

Use the ip ospf cost command to configure the cost metric manually for each interface. This command overrides any settings for the reference bandwidth that you set using the reference-bandwidth command in router configuration mode.

What does OSPF use to calculate the best route?

If there are multiple routes to a network with the same route type, the OSPF metric calculated as cost based on the bandwidth is used for selecting the best route. The route with the lowest value for cost is chosen as the best route.