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36 Cards in this Set

  • Front
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BDR

Backup Designated Router



If something happens to the designated router (DR,) this will take its place

Full Neighbor Adjacencies

After two routers establish neighbor adjacency using hello packets, they synchronize their LSDBs by exchanging LSAs and confirming the receipt of LSAs from the adjacent router. The two neighbor routers now recognize that they have synchronized their LSDBs with each other. For OSPF, this means that the routers are now in full adjacency state with each other.

Multi-access

A computer network that permits every computer on it to communicate with the network at any time during operation.

Highest Priority

The router with the highest OSPF priority on a segment will become the DR for that segment.

Second Highest Priority

This router will become the Backup Designated Router (BDR)

If you change a router ID what do you have to do before it will take affect?

You have to reset the OSPF in order to select a new DR/BDR

DROTHER

DRothers will form adjacency with DR and BDR only. DRother is a router that’s neither a DR nor a BDR.

Do DRothers send update?

DRother routers still send hello packet to ALLSPFROUTERS using 224.0.0.5 to check the existence of neighbouring OSPF routers.



NOTE


Updates will only be sent using multicast on 224.0.0.6, only DR and BDR will listen to this MC.

What command allows you to change the OSPF Priority

Router(Config)# int fa 0/0


Router(Config-if)#ip ospf priority (place priority # here)

What priority guarantees the router will never be elected a DR or BDR?

Priority of 0

What command allows your priority command to take affect?

Clear ip ospf process

How can you see what type pf OSPF is selected?

shop ip ospf interface

If you select a non-broadcast network type what does the router assume?

It will assume you are running a multi-access network

What does the router have to do in multi-access?

1. select a DR and BDR


2. Non-broadcast means that OSPF expects us to configure neighbors ourselves

What command allows me to change the OSPF Type?

ip OSPF network non-broadcast

If you want to make sure a spoke router never becomes a DR or BDR what do you do?

use command:



neighbor <ip address> priority 0

In a broadcast network type do we have to configure neighbors?

No

In frame relay what statement must be present for you broadcast to work?

You must have a frame-relay map statement with the broadcast keyword.

What are the only 2 routers that require a broadcast and non-broadcast type?

1. Broadcast


2. Non-broadcast

If you use point-to-point, point-to-mulitipoint, point-to-multipoint non-broacast; how will OSPF view this?

OSPF will see the network as a collection of point-to-point links

What are 4 things to be aware of in point-to-mulitpoint?

1. Automatic neighbor discover so no need to configure OSPF neighbors yourself


2. No DR/BDR election since OSPF sees the network as a collection of point-to-point links


3. Only a single IP subnet is used


4. Make sure your frame-relay network is configured with the broadcast command

What command is needed to enable point-to-multipoint?

Router(config)# int s 0/0


Router (config-if)# ip ospf network point-to-multipoint

What are four key points about a point-to-point network?

1. Automatic Neighbor discovery so no need to configure OSPF Neighbors yourself


2. No DR/BDR election since OSPF sees the network as a collection of point-to-point networks


3. Normally uses for point-to-point sub-interfaces with an IP subnet per link


4. Can also be used for single IP subnets

What command resets ospf in global config mode?

Router(config)#default interface s 0/0

In OSPF what type of adjacency does broadcast form?

Automatic DR/BDR

In OSPF what type of adjacency does non-broadcast form?

Manual DR/BDR

In OSPF what type of adjacency does Point-to-Multipoint non-broadcast

Manual no DR/BDR

In OSPF what type of adjacency does point-to-multipoint

Automatic no DR/BDR

In OSPF what type of adjacency does Point-to-Point?

Automatic no DR/BD

What is the hello timer for Broadcast network?

10

What is the hello timer for non-broadcast network?

30

What is the hello timer for point-to-multipoint network?

30

What is the hello timer for point-to-multipoint non-broadcast network?

30

What is the hello timer for point-to-point network?

10

Are broadcast and non-broadcast compatible?

Yes, they both require an election of DR/BDR



NOTE


Set the hello timers to the same value and they will work together

Are point-to-multipoint, point-to-multipoint nonbroadcast and point-to-point compatible

Yes.



Non of them require a DR/BDR, just set the hello timers the same