CCNP / https://www.washingtonpost.com/newssearch/?query=토토사이트 BSCI Exam Tutorial: Route Summarization And The OSPF Null Interface
CCNP Test good results, notably within the BSCI Test, demands you have an understanding of the details of route summarization. This skill not merely involves that you've a convenience degree with binary conversions, but you have to know the way and the place to use route summarization with Each and every specific protocol.
You also have to find out the 먹튀 “side effects” of route summarization. With OSPF, there'll really be an additional interface produced at the point of summarization, and this catches a lot of CCNP candidates abruptly. Enable’s Consider the null0 interface And the way it relates to OSPF summarization.
On R1, the next networks are redistributed into OSPF, and then summarized.
interface Loopback16
ip deal with sixteen.sixteen.16.sixteen 255.0.0.0
interface Loopback17
ip address seventeen.17.17.seventeen 255.0.0.0
interface Loopback18
ip deal with eighteen.eighteen.eighteen.eighteen 255.0.0.0
interface Loopback19
ip handle 19.19.19.19 255.0.0.0
R1(config)#router ospf one
R1(config-router)#redistribute related subnets
R1(config-router)#summary-address 16.0.0.0 252.0.0.0
The summary handle appears on R2, a downstream router.
R2#clearly show ip route ospf
O E2 sixteen.0.0.0/six [110/twenty] by means of 172.twelve.123.one, 00:00:05, Serial0
Let’s go back to R1 and have a look at its OSPF desk.
R1#show ip route ospf
O 16.0.0.0/six is actually a summary, 00:01:51, Null0
In which did the null0 interface come from, and why could it be there? Packets sent to the null interface are dropped, and In such cases, that’s a great issue.
Once you configure summary routes in OSPF, a path to null0 will be set up in the OSPF routing table. This assists to prevent routing loops. Any packets destined for your routes which were summarized will likely have a longer match during the routing table, as shown under…
C seventeen.0.0.0/eight is straight connected, Loopback17
C sixteen.0.0.0/eight is specifically connected, Loopback16
C 19.0.0.0/8 is straight related, Loopback19
C 18.0.0.0/eight is directly related, Loopback18
O sixteen.0.0.0/six can be a summary, 00:01:fifty one, Null0
.. and packets that don't match on the list of summarized routes but do match the summary route will be dropped.
Avoiding routing loops when performing route redistribution and summarization is important. OSPF offers us slightly assist in that regard in this example, and as you examine a lot more complex redistribution eventualities in your method to the CCNP and CCIE, you’ll recognize that we’ll choose all the assistance we could possibly get!