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Cisco CCNP ENCOR > OSPF Commands > Flashcards

OSPF Commands Flashcards

1
Q

Initialize the OSPF Process

A

Router(config)# router ospf process-id

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2
Q

Enable OSPF on interfaces that match a specified network range

A

Router(config-router)# network ip-address wildcard-mask area area-id

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3
Q

Enable OSPF explicitly on a specific interface

A

From interface config mode:

Router(config-if)# ip ospf process-id area area-id

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4
Q

Configure a specific interface as passive

A

Router(config-router)# passive-interface interface-id

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5
Q

Configure all interfaces as passive

A

Router(config-router)# passive-interface default

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6
Q

Advertise a default route into OSPF (for an ABR)

A

Router(config-router)# default-information originate [always] [metric metric-value] [metric-type type]

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7
Q

Modify the OSPF reference bandwidth for dynamic interface metric costing

A

Router(config-router)# auto-cost reference-bandwidth mbps

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8
Q

Statically assign an OSPF cost to an interface

A

Router(config-if)# ip ospf cost 1-65535

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9
Q

Configure the OSPF priority for a DR/BDR election

A

Router(config-if)# ip ospf priority 0-255

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10
Q

Modify the default hello timer of an OSPF interface

A

Router(config-if)# ip ospf hello-interval 1-65535

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11
Q

Modify the default dead interval timer of an OSPF interface

A

Router(config-if)# ip ospf dead-interval 1-65535

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12
Q

Statically configure an interface as a broadcast OSPF network type

A

Router(config-if)# ip ospf network broadcast

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13
Q

Statically configure an interface as a point-to-point OSPF network type

A

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

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14
Q

Restart the OSPF process

A

Router# clear ip ospf process

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15
Q

Display OSPF interfaces on a router

A

Router# show ip ospf int [brief | interface-id]

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16
Q

Display the OSPF neighbors and current states

A

Router# show ip ospf neighbor [detail]

17
Q

Display the OSPF routes that are installed in the RIB

A

Router# show ip route ospf

18
Q

Summarize routes as they are crossing an OSPF ABR (aka Inter-area route summarization)

A

Router(config-router)# area {area-id} range network-address subnet-mask

NOTE: The network address and subnet will be the summarized result

Example:
RouterABR1(config-router)# area 0 range 10.1.0.0 255.255.0.0

19
Q

Filter a route using a route summary on an OSPF ABR

A

Router(config-router)# area area-id range network-address subnet-mask not-advertise

Example:
Router3(config-router)# area 0 range 10.0.0.0 255.255.0.0 not-advertise

20
Q

Filter routes as they cross an OSPF ABR

A

Router(config-router)# area area-id filter-list prefix PF-LIST-NAME {in | out}

21
Q

Create a prefix list (2 commands)

A

Router(config)# ip prefix-list NAME deny subnet-address/mask
Router3(config)# ip prefix-list NAME permit 0.0.0.0/0 le 32

Example:
Router(config)# ip prefix-list FILTER_A deny 10.1.35.0/24
Router(config)# ip prefix-list FILTER_A permit 0.0.0.0/0 le 32

22
Q

Filter OSPF routes from entering the RIB

A

Router(config-router)# distribute-list {acl-number | acl-name | prefix prefix-list-name |route-map *route-map-name} in

23
Q

Display the LSAa in the LSDB

A

Router# show ip ospf database [router | network | summary]

24
Q

Redistribute static routes from an OSPF router (becoming an ASBR)

A

Router1(config-router)# redistribute static subnets

25
What is the command to summarize routes from an ASBR?
Router(config-router)# **summary-address** *network-address* *subnet-mask* Example: Router1(config-router)# summary-address 10.11.1.0 255.255.255.0
26
What commands would be used to filter external static routes on an ASBR using a route-map?
Router(config)# **access-list** *list-id* **deny** *network-address wildcard-mask* Router(config)# **access-list** *list-id* **permit any** Router(config)# **route-map** *NAME* **deny** *sequence-num* Router(config-route-map)# **match ip address** *ACL-id* Router(config)# **router ospf** *process-id* Router(config-router)# **redistribute static subnets route-map** *NAME* Example: Router(config)# access-list 99 deny 10.1.1.0 0.0.0.255 Router(config)# access-list 99 permit any Router(config)# route-map STATIC_FILTER deny 10 Router(config-route-map)# match ip address 99 Router(config)# router ospf 1 Router(config-router)# redistribute static subnets route-map STATIC_FILTER
27
What command(s) would you use to filter OSPF routes from a router's local/own routing table?
Router(config-router)# **distribute-list** *ACL-id* **in** OR Router(config-router)# **distribute-list prefix** *prefix-list-id* **in** OR Router(config-router)# **distribute-list route-map** *route-map-id* **in** **Example:** Router(config)# access-list 99 deny 10.11.23.0 0.0.0.255 Router(config)# access-list 99 permit any Router(config)# router ospf 1 Router(config-router)# distribute-list 99 in
28
What are the commands to make an area a Stub Area? Where would this be configured?
Configure on all routers in the Stub Area: Router(config-router)# **area** *area-id* **stub** Example: Router(config-router)# area 2 stub
29
What are the commands to make an area a Totally Stubby Area? Where would this be configured?
Configure on all routers in the Stub Area: Router(config-router)# **area** *area-id* **stub no-summary** Example: Router(config-router)# area 2 stub no-summary
30
What are the commands to make an area a Not So Stubby Area? Where would this be configured?
Configure on all routers in the Stub Area: Router(config-router)# **area** *area-id* **nssa** Example: Router(config-router)# area 2 stub nssa
31
What command is needed to summarize routes for a NSSA? Where is this configured?
On the ABR: Router(config-router)# **area** *area-id* **nssa default-information-originate** Example: Router(config-router)# area 2 nssa default-information-originate
32
In OSPFv3, display LSA type 3
**show ipv6 ospf database inter-area prefix**
33
In OSPFv3, display LSA type 4
**show ipv6 ospf database inter-area router**
34
In OSPFv3, display LSA type 8
**show ipv6 ospf database link**
35
In OSPFv3, display LSA type 9
**show ipv6 ospf database prefix**

Cisco CCNP ENCOR (27 decks)

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