CCNP Bsci Portable Command Guide

images
CCNP
CCNP Bsci Portable Command Guide

The success of your BSCI and CCNP exams depends on the understanding of the details, one of which is the right way to understand the routing in OSPF. The route summary is not just a test of the binary conversion capability, but also where and when to aggregate the route. No CCNA or CCNP certified candidates are surprised, and OSPF provides us with the most routing aggregation options, so you need to learn more!

OSPF provides two options for routing summary configuration. In the previous tutorial, we looked at the "summary-address" command, and today we will look at the correct use of the "area range" command.

"area range" commands should be used in the Area Border Router (ABR) to summarize the advertised routes from one OSPF area to another. In this tutorial, R1 acts as an ABR and has an interface in both area 0 and area 1. Four loopback is placed in area 1 in R1.

R1(config)#router ospf 1

R1(config-router)#network 12.0.0.0 0.255.255.255 a 1

R1(config-router)#network 13.0.0.0 0.255.255.255 a 1

R1(config-router)#network 14.0.0.0 0.255.255.255 a 1

R1(config-router)#network 15.0.0.0 0.255.255.255 a 1

The routing table of an OSPF neighbor, R2, shows all four routes.

R2#show IP route OSPF

12.0.0.0/32 is subnetted, 1 subnets

O IA 12.12.12.12 [110/65] via 172.12.123.1, 00:18:52, Serial0

13.0.0.0/32 is subnetted, 1 subnets

O IA 13.13.13.13 [110/65] via 172.12.123.1, 00:18:42, Serial0

14.0.0.0/32 is subnetted, 1 subnets

O IA 14.14.14.14 [110/65] via 172.12.123.1, 00:18:32, Serial0

15.0.0.0/32 is subnetted, 1 subnets

O IA 15.15.15.15 [110/65] via 172.12.123.1, 00:18:32, Serial0

To keep the routing table of the downstream router small but still have the required IP connection, we can summarize the four routes using the area range command on R1. The key thing to remember with the range command is that the region number given in the command is the region that contains the destination, not the region that will receive the summary route.

R1(config)#router ospf 1

R1(config-router)#area 1 range 12.0.0.0 252.0.0.0

R2 now shows a single summary route that can be used to reach all four remote networks.

R2#show IP route OSPF

O IA 12.0.0.0/6 [110/65] via 172.12.123.1, 00:00:21, Serial0

Interestingly enough, there's now an additional route in R1's routing table.

R1#show IP route OSPF

O 12.0.0.0/6 is a summary, 00:07:53, Null0

When the summary route is configured in OSPF, the route to null0 is installed in the OSPF routing table of the router performing the summary. This helps prevent routing loops. Any packets sent to the summarized route will have longer matches in the routing table, and packets that match one of the summary routes but match the summary route will be dropped.

Note: CCNP Bsci Portable Command is a vital part of the CCNP certification exam. if you are preparing or will prepare for the CCNP certification exam, and you can contact us. SPOTO will give the most comprehensive knowledge of CCNP commands.

About SPOTO

SPOTO focus on online IT Certification training for 16 years. SPOTO offers 100% real and valid Cisco CCNA, CCNP, CCIE, ISC, Amazon AWS, Microsoft, and other IT exam practice tests. And we have many free online training courses of Cisco exam on YouTube. You can find many useful and helpful tips and suggestions. If you’re still worried about to prepare and pass the Cisco exam, try SPOTO now. SPOTO tutors will help you get the CCIE number at the first try.



Cisco Pass Report View More >

CCIE RS Written
Sep 16, 2019
CCIE RS Written
CCIE RS Written
Sep 16, 2019
CCIE RS Written
CCIE RS Written
Sep 16, 2019
CCIE RS Written
CCIE RS Lab
Sep 16, 2019
CCIE RS Lab
CCIE RS Lab
Sep 16, 2019
CCIE RS Lab
CCIE Security Written
Sep 16, 2019
CCIE Security Written
CCIE Wireless Written
Sep 13, 2019
CCIE Wireless Written
CCIE RS Written
Sep 13, 2019
CCIE RS Written
CCIE RS Written
Sep 13, 2019
CCIE RS Written
CCIE Security Lab
Sep 13, 2019
CCIE Security Lab