Planning to move the CCNA Test and gain this crucial Cisco certification? Route summarization is just one of the numerous techniques you’ll really need to learn so as to earn your CCNA. Regardless of whether it’s RIP version two, OSPF, or EIGRP, the CCNA Examination will demand that you could flawlessly configure route summarization.
Route summarization isn’t just vital for the CCNA Test. It’s a worthwhile skill to get in the true earth also. Accurately summarizing routes may lead to scaled-down routing tables that are still able to route packets precisely – what I love to call “concise and total” routing tables.
The main ability you’ve bought to acquire in order to function with route summarization is binary math; a lot more specifically, you should be able to consider several routes and come up with the two a summary route and mask to publicize to downstream routers. Presented the networks a hundred.16.0.0 /sixteen, 100.17.0.0 /16, 100.eighteen.0.0 /16, and 100.19.0.0 /sixteen, could you immediately think of equally the summary handle and mask? All you'll want to do is crack the four community quantities down into binary strings. We know the last two octets will all transform on the binary string 00000000, so in this article we’ll only illustrate how to convert the main and 2nd octet from decimal to binary.
one hundred sixteen = 01100100 00010000
one hundred seventeen = 01100100 00010001
a hundred eighteen = 01100100 00010010
one hundred 19 = 01100100 00010011
To come up with the summary route, just work from remaining to right and draw a line exactly where the four networks no more have a bit in widespread. For these 4 networks, that time comes among the 14th and 15th bits. This leaves us using this type of string: 01100100 000100xx. All you'll want to do is convert that string back to decimal, which provides us 100 for the first octet and sixteen for the second. (The 2 x values are bits on the best side of the line, which aren’t Employed in calculating the summary route.) Given that we know that zero is the value for the last two octets, the resulting summary community number is one hundred.16.0.0.
But we’re not accomplished! We now need to think of the summary mask to publicize along with the summary route. To reach on the summary route, generate out a mask in binary having a “1” For each little bit to your remaining of the line we drew Beforehand, along with a “0” for every bit to the ideal. That offers us the next string:
11111111 11111100 00000000 00000000
Changing that to dotted decimal, we arrive on the summary mask 255.252.0.0. The proper summary network and mask to market are a hundred.sixteen.0.0 252.0.0.0.
With the CCNA Examination, emphasis is put on being aware of the best way to publicize these summary routes in RIPv2 and EIGRP. For both of those of these protocols, route summarization paris-informatique.fr/ comes about on the interface stage – it’s not configured beneath the protocol. Around the interface that should publicize the summary route, use the command “ip summary-tackle”. Listed below are samples of how the above summary route could be configured on ethernet0 in equally RIPv2 and EIGRP.
R1(config-if)#ip summary-handle rip one hundred.16.0.0 255.252.0.0
R1(config-if)#ip summary-address eigrp one hundred 100.16.0.0 255.252.0.0
The primary difference between The 2 is that the EIGRP command have to specify the AS quantity – that’s just what the “100” is in the middle of the EIGRP command. Because RIPv2 will not use AS quantities, there’s no additional value wanted within the configuration.
For OSPF, the commands differ. When you’re configuring inter-region route summarization, use the “location range” command; When you are summarizing routes that are increasingly being redistributed into OSPF, make use of the summary-deal with command beneath the OSPF routing process around the ASBR. Neither of they're interface-degree instructions.
I discuss from knowledge when I inform you that follow would make fantastic over the CCNA exam, Particularly with binary and summarization questions. The great thing about these concerns is that there are no grey locations with these questions – you possibly learn how to do it or you don’t. And with observe and an eye for detail, you'll be able to learn these competencies, move the exam, and become a CCNA. In this article’s to your achievement!