™ Summarizing routes is an important talent to find out to go the BSCI Test and obtain a single stage nearer to earning your CCNP. The particular binary conversions are only Section of the check, while! You’ve acquired to understand how to properly apply the summary routes, and that differs from a single protocol to the subsequent. In the previous couple of CCNP / BSCI tutorials, we’ve looked at using the “location range” and “summary-deal with” commands to accomplish OSPF route summarization. Currently, we’ll Look into summarizing routes in EIGRP. We’ll use the subsequent 4 loopback addresses in this instance: Loopback sixteen, sixteen.16.16.16 /32 Loopback 17, seventeen.17.17.17 /32 Loopback eighteen, eighteen.eighteen.18.18 /32 Loopback 19. 19.19.19.19 /32 On R1, we’ll area these 4 addresses into EIGRP AS one hundred. R1(config-if)#router eigrp a hundred R1(config-router)#community sixteen.sixteen.16.sixteen 0.0.0.0 R1(config-router)#community seventeen.17.17.seventeen 0.0.0.0 R1(config-router)#community eighteen.18.eighteen.eighteen 0.0.0.0 R1(config-router)#network 19.19.19.19 0.0.0.0 R3 is really an EIGRP neighbor of R1, and that Aide informatique à domicile Paris router’s EIGRP routing table now seems like this: R3#clearly show ip route eigrp 17.0.0.0/32 is subnetted, 1 subnets D 17.seventeen.17.seventeen [ninety/2297856] via 172.12.123.1, 00:00:29, Serial0 sixteen.0.0.0/32 is subnetted, 1 subnets D sixteen.16.sixteen.sixteen [90/2297856] through 172.12.123.one, 00:00:36, Serial0 19.0.0.0/32 is subnetted, one subnets D 19.19.19.19 [ninety/2297856] by means of 172.twelve.123.one, 00:00:08, Serial0 eighteen.0.0.0/32 is subnetted, one subnets D eighteen.18.18.18 [90/2297856] by using 172.twelve.123.1, 00:00:22, Serial0 To execute handbook route summarization, publish out the network addresses in binary and then decide the point at which the addresses now not have a little bit in popular. For these four addresses, It'll be ample to write down out the very first octet in binary: 1600010000 1700010001 1800010010 1900010011 Performing from remaining to correct, the common bits are the 1st 6 bits – 000100xx. In decimal, this worth is 16. The summary mask need to be identified at the same time, Which value is derived from putting a “one” in the mask for every common little bit. With the main 6 bits all set to 1 – 11111100 – the resulting mask is 252.0.0.0. The total summary handle is sixteen.0.0.0 252.0.0.0. In EIGRP, the summary deal with is in fact configured on an interface, not beneath the routing approach. R1(config)#interface serial0 R1(config-if)#ip summary-deal with eigrp a hundred sixteen.0.0.0 252.0.0.0 02:39:50: %DUAL-five-NBRCHANGE: IP-EIGRP a hundred: Neighbor 172.12.123.three (Serial0) is down: summary configured 172.12.123.2 (Serial0) is down: summary configured 02:forty:16: %Twin-5-NBRCHANGE: IP-EIGRP one hundred: Neighbor 172.twelve.123.2 (Serial0) is up : new adjacency 02:forty:17: %DUAL-5-NBRCHANGE: IP-EIGRP one hundred: Neighbor 172.12.123.three (Serial0) is up: new adjacency There’s an instantaneous side influence in this article that the majority of books go away out. Your EIGRP adjacencies are going to arrive down after you configure this summary, but they need to come back up speedily. The key phrase there is “really should”. For those who configure EIGRP summary addresses over a creation network, you may want to do that all through non-peak hours. The timestamps on the above mentioned commands point out that the adjacencies had been down for around 27 seconds more than the NBMA network. That’s about half an hour in close-consumer time. ? Check R3’s EIGRP routing table. D sixteen.0.0.0/6 [ninety/2297856] through 172.twelve.123.one, 00:01:46, Serial0 The four summarized routes are not during the routing table, and they are already replaced via the summary route revealed at the bottom of the routing desk. Detect the mask is /five, that is prefix notation for 248.0.0.0. Figuring out how and why to summarize routes is usually a valuable talent, whatever the protocol in use. But before you go ahead and take BSCI Test on your solution to the CCNP, make sure you know how to carry out summarization with all the Main protocols!
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