Eigrp Basics

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  • Backup Routes Rip protokolunde, 192.168.1.0 network’uicin primary route bulunurve routing table’akoyulur, primary route gittiginde, tekrar converge edipdigeryolubulur. OSPF, ISIS gibiprotocollerdeise backup Route, Topology Table database’ indetutulur. Bu daspf’in run edilip, LSDB ye konmasiylagerceklestirilir.EIGRP de ise first best path Routing table’akoyulur, second best path Feasible successor olarak Topology table dayerinialir. Primary gittigindeyenihesaplamaolmadan, primary haline 200ms icindegelir.SummarizationOSPF’te summarization yalnizca ABR’ lararasindafarklibir area’ yagecisteyadaASBR’larilefarkliprotokolleregecistesaglanirkensaglanir. EIGRP de ise her noktada summarization mumkundur.
  • Neighbor Table : Hello mesajlariiledirekbaglioldugurouterlarilecesitlimetric’lerikarsilastirdiktansonra, adjacency kurmasi. Topology Table: Successor routelarin, feasible successor route’ larinve 3. – 4. en iyiroutelarinbulundugutablo.Routing Table : Best Routelarinbulundugutablo.
  • Feasible Successor olamasiicin AD degerinin Successor FD sindenkucukolmasigerekir. Boylelikle Routing loop engellenir. (192.168.1.0’i R4 veya R3, R1’e ogretmez.)R1 in R4 uzerindenolan AD si 10 < 110 (Successor FD). Boylelikle R1 – R4 yolu Feasible Successor oluyor.Active Route : Successor Route’imindusmesidurumundaquerrylerinereyeyollayacagim.
  • Metric hesaplanirkenhepsikullanilir,mtuharic.Yolustundeki en dusukbandwitdhkullanilir.Her bir hop icin delay toplanarakartar.
  • Eigrp Basics

    1. 1. EIGRP<br />Alp ISIK<br />Netas 2010<br />
    2. 2. Why Do We choose EIGRP <br />Backup Routes (fast convergence, Dual)<br />Flexibility in summarization<br />* Unequal cost load-balancing, it’s unique to EIGRP.<br />Combines of Distance Vector and Link State <br />R2<br />Primary<br />R1<br />X<br />192.168.1.0/24<br />R3<br />
    3. 3. EIGRP Tables<br />Neighbor Table<br />Topology Table<br />Routing Table<br />
    4. 4. EIGRP Terminologies 1<br />Feasible Distance (FD) <br />Advertised distance (AD)<br />192.168.1.0/24<br />R1<br />R2<br />200<br />100<br />R4<br />R3<br />10<br />10<br />192.168.2.0/24<br />R1 in R3 uzerinden 192.168.2.0 networkuneolan FD si 110, FD toplamyolugosterir. AD de isekomsunun o networkeolanuzakligidiryani R3 un 192.168.2.0 olanuzakligi (10)<br />
    5. 5. EIGRP Terminologies 2<br />Successor (Primary Route)<br />Feasible Successor(s) [Backup Route(s)] : Router 4 uzerindengidenyol.<br />Active Route (Actively trying to find a backup)<br />Passive Route<br />
    6. 6. EIGRP Neighborhood<br />Hello : forms relationship, send to 224.0.0.10.<br />Update : Sends Routing table<br />Query : Ask about routes<br />Reply : Response of Query<br />Ack : Act to every update, query, response<br />
    7. 7. EIGRP Metric Calculation<br />Bandwitdh<br />Delay<br />Reliability<br />Loading<br />MTU (send at neighbor update but not affect metric)<br /> These are also known as K values.<br />
    8. 8. EIGRP Implementetion<br />Configured for GNS3, attached at the end of the Doc<br />
    9. 9. EIGRP Topology<br />R1(config)#do show ip eigrp topo<br />IP-EIGRP Topology Table for AS(90)/ID(172.30.8.1)<br />Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,<br /> r - reply Status, s - sia Status<br />P 10.1.2.0/24, 1 successors, FD is 307200<br /> via 10.1.34.2 (10051072/281600), FastEthernet0/1<br /> via 10.1.24.2 (20051200/281600), FastEthernet0/0<br />P 10.1.24.0/30, 1 successors, FD is 20025600<br /> via Connected, FastEthernet0/0<br />P 10.1.34.0/30, 1 successors, FD is 10025472<br /> via Connected, FastEthernet0/1<br />P 172.30.2.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback2<br />P 172.30.3.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback3<br />P 172.30.0.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback0<br />P 172.30.1.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback1<br />P 172.30.6.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback6<br />P 172.30.7.0/24, 1 successors, FD is 128256<br />Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,<br /> r - reply Status, s - sia Status<br /> via Connected, Loopback7<br />P 172.30.4.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback4<br />P 172.30.5.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback5<br />P 172.30.8.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback8<br />Feasible distance<br />Adverticed distance<br />
    10. 10. EIGRP Topology<br />R1(config-router)#do show ip eigrp topo<br />IP-EIGRP Topology Table for AS(90)/ID(172.30.8.1)<br />Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,<br /> r - reply Status, s - sia Status<br />P 10.1.2.0/24, 1 successors, FD is 10051072<br /> via 10.1.34.2 (10051072/281600), FastEthernet0/1<br /> via 10.1.24.2 (20051200/281600), FastEthernet0/0<br />P 10.1.25.0/24, 1 successors, FD is 10179072<br /> via 10.1.34.2 (10179072/409600), FastEthernet0/1<br /> via 10.1.24.2 (20153600/128256), FastEthernet0/0<br />P 10.1.24.0/30, 1 successors, FD is 20025600<br /> via Connected, FastEthernet0/0<br />P 10.1.34.0/30, 1 successors, FD is 10025472<br /> via Connected, FastEthernet0/1<br />P 192.168.1.0/24, 1 successors, FD is 256<br /> via Rstatic (256/0)<br />P 172.30.2.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback2<br />P 172.30.3.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback3<br />P 172.30.0.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback0<br />Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,<br /> r - reply Status, s - sia Status<br />P 172.30.1.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback1<br />P 172.30.6.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback6<br />P 172.30.7.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback7<br />P 172.30.4.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback4<br />P 172.30.5.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback5<br />P 172.30.8.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback8<br />Redistributed static route <br />
    11. 11. Changed the network as below<br />
    12. 12. EIGRP Topology (Used serial at R1) instead of FE.<br />BB#show ip eigrp topo<br />IP-EIGRP Topology Table for AS(90)/ID(172.30.8.1)<br />Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,<br /> r - reply Status, s - sia Status<br />P 10.1.2.0/24, 1 successors, FD is 10537472<br /> via 10.1.34.2 (10537472/281600), Serial0/1<br /> via 10.1.24.2 (20537600/281600), Serial0/0<br />P 10.1.25.0/24, 1 successors, FD is 10563072<br /> via 10.1.34.2 (10563072/307200), Serial0/1<br /> via 10.1.24.2 (20537600/281600), Serial0/0<br />P 10.1.24.0/24, 1 successors, FD is 21049600<br /> via 10.1.34.2 (21049600/20537600), Serial0/1<br />P 10.1.24.0/30, 1 successors, FD is 20512000<br /> via Connected, Serial0/0<br />P 10.1.34.0/30, 1 successors, FD is 10511872<br /> via Connected, Serial0/1<br />P 172.30.2.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback2<br />P 172.30.3.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback3<br />P 172.30.0.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback0<br />Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,<br /> r - reply Status, s - sia Status<br />P 172.30.1.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback1<br />P 172.30.6.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback6<br />P 172.30.7.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback7<br />P 172.30.4.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback4<br />P 172.30.5.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback5<br />P 172.30.8.0/24, 1 successors, FD is 128256<br /> via Connected, Loopback8<br />
    13. 13. EIGRP Routes<br />R3(config-router)#do show ip route<br />Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP<br /> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area<br /> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2<br /> E1 - OSPF external type 1, E2 - OSPF external type 2<br /> i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2<br /> ia - IS-IS inter area, * - candidate default, U - per-user static route<br /> o - ODR, P - periodic downloaded static route<br />Gateway of last resort is not set<br /> 172.30.0.0/24 is subnetted, 9 subnets<br />D 172.30.2.0 [90/10639872] via 10.1.34.1, 00:01:07, Serial0/1<br />D 172.30.3.0 [90/10639872] via 10.1.34.1, 00:01:07, Serial0/1<br />D 172.30.0.0 [90/10639872] via 10.1.34.1, 00:01:07, Serial0/1<br />D 172.30.1.0 [90/10639872] via 10.1.34.1, 00:01:07, Serial0/1<br />D 172.30.6.0 [90/10639872] via 10.1.34.1, 00:01:07, Serial0/1<br />D 172.30.7.0 [90/10639872] via 10.1.34.1, 00:01:07, Serial0/1<br />D 172.30.4.0 [90/10639872] via 10.1.34.1, 00:01:07, Serial0/1<br />D 172.30.5.0 [90/10639872] via 10.1.34.1, 00:01:07, Serial0/1<br />D 172.30.8.0 [90/10639872] via 10.1.34.1, 00:01:07, Serial0/1<br /> 10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks<br />C 10.1.2.0/24 is directly connected, FastEthernet0/0<br />D 10.1.25.0/24 [90/307200] via 10.1.2.2, 00:01:23, FastEthernet0/0<br />R3(config-router)#do show ip eigrp nei<br />IP-EIGRP neighbors for process 90<br />H Address Interface Hold Uptime SRTT RTO Q Seq<br /> (sec) (ms) Cnt Num<br />1 10.1.34.1 Se0/1 11 00:02:36 674 4044 0 5<br />0 10.1.2.2 Fa0/0 13 00:02:52 659 3954 0 9<br />
    14. 14. Ip-default network command<br />If we have given any network via ip default-network command at BB router, and advertise that network in EIGRP, We have seen that network has been learned from EIGRP at R2.<br />BB(config)#do show ip route<br />Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP<br /> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area<br /> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2<br /> E1 - OSPF external type 1, E2 - OSPF external type 2<br />i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2<br />ia - IS-IS inter area, * - candidate default, U - per-user static route<br /> o - ODR, P - periodic downloaded static route<br />Gateway of last resort is not set<br /> 172.30.0.0/24 is subnetted, 9 subnets<br />C 172.30.2.0 is directly connected, Loopback2<br />C 172.30.3.0 is directly connected, Loopback3<br />C 172.30.0.0 is directly connected, Loopback0<br />C 172.30.1.0 is directly connected, Loopback1<br />C 172.30.6.0 is directly connected, Loopback6<br />C 172.30.7.0 is directly connected, Loopback7<br />C 172.30.4.0 is directly connected, Loopback4<br />C 172.30.5.0 is directly connected, Loopback5<br />C 172.30.8.0 is directly connected, Loopback8<br /> 10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks<br />D 10.1.2.0/24 [90/10537472] via 10.1.34.2, 00:06:26, Serial0/1<br />D 10.1.25.0/24 [90/10563072] via 10.1.34.2, 00:06:26, Serial0/1<br />D 10.1.24.0/30 [90/21049600] via 10.1.34.2, 00:06:27, Serial0/1<br />C 10.1.24.0/24 is directly connected, Serial0/0<br />C 10.1.34.0/24 is directly connected, Serial0/1<br />S* 192.168.2.0/24 is directly connected, Null0<br />Means candidate default<br />
    15. 15. Ip-default network command<br />It’s passing to other’s with * as well.<br />R2(config)#do show ip route<br />Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP<br /> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area<br /> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2<br /> E1 - OSPF external type 1, E2 - OSPF external type 2<br /> i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2<br /> ia - IS-IS inter area, * - candidate default, U - per-user static route<br /> o - ODR, P - periodic downloaded static route<br />Gateway of last resort is 10.1.2.3 to network 192.168.2.0<br /> 172.30.0.0/24 is subnetted, 9 subnets<br />D 172.30.2.0 [90/10665472] via 10.1.2.3, 00:00:23, FastEthernet0/0<br />D 172.30.3.0 [90/10665472] via 10.1.2.3, 00:00:23, FastEthernet0/0<br />D 172.30.0.0 [90/10665472] via 10.1.2.3, 00:00:23, FastEthernet0/0<br />D 172.30.1.0 [90/10665472] via 10.1.2.3, 00:00:23, FastEthernet0/0<br />D 172.30.6.0 [90/10665472] via 10.1.2.3, 00:00:23, FastEthernet0/0<br />D 172.30.7.0 [90/10665472] via 10.1.2.3, 00:00:23, FastEthernet0/0<br />D 172.30.4.0 [90/10665472] via 10.1.2.3, 00:00:23, FastEthernet0/0<br />D 172.30.5.0 [90/10665472] via 10.1.2.3, 00:00:23, FastEthernet0/0<br />D 172.30.8.0 [90/10665472] via 10.1.2.3, 00:00:23, FastEthernet0/0<br /> 10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks<br />C 10.1.2.0/24 is directly connected, FastEthernet0/0<br />C 10.1.25.0/24 is directly connected, FastEthernet0/1<br />C 10.1.24.0/30 is directly connected, Serial0/0<br />D 10.1.24.0/24 [90/21049600] via 10.1.2.3, 00:11:32, FastEthernet0/0<br />D 10.1.34.0/24 [90/10537472] via 10.1.2.3, 00:00:24, FastEthernet0/0<br />D* 192.168.2.0/24 [90/10537472] via 10.1.2.3, <br />
    16. 16. Summurizing the loopback addresses at BB<br />Both for S0/0 and S0/1<br />BB(config-if)#ip summary-address eigrp 90 172.30.0.0 255.255.248.0<br />Then we see the routes as below :<br />R3#show ip route<br />Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP<br /> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area<br /> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2<br /> E1 - OSPF external type 1, E2 - OSPF external type 2<br />i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2<br />ia - IS-IS inter area, * - candidate default, U - per-user static route<br /> o - ODR, P - periodic downloaded static route<br />Gateway of last resort is 10.1.34.1 to network 192.168.2.0<br /> 172.30.0.0/16 is variably subnetted, 2 subnets, 2 masks<br />D 172.30.0.0/21 [90/10639872] via 10.1.34.1, 00:00:25, Serial0/1<br />D 172.30.8.0/24 [90/10639872] via 10.1.34.1, 00:00:25, Serial0/1<br /> 10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks<br />C 10.1.2.0/24 is directly connected, FastEthernet0/0<br />D 10.1.25.0/24 [90/307200] via 10.1.2.2, 00:09:20, FastEthernet0/0<br />D 10.1.24.0/30 [90/20537600] via 10.1.2.2, 00:09:20, FastEthernet0/0<br />D 10.1.24.0/24 [90/21024000] via 10.1.34.1, 00:00:26, Serial0/1<br />C 10.1.34.0/24 is directly connected, Serial0/1<br />D* 192.168.2.0/24 [90/10511872] via 10.1.34.1, 00:00:25, Serial0/1<br />R3#<br />
    17. 17. Varience Command, load balancing<br />Via Varience command we can ensure load balancing<br />R2(config-router)#do show ipeigrptopo<br />IP-EIGRP Topology Table for AS(90)/ID(10.1.25.2)<br />Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,<br /> r - reply Status, s - sia Status<br />P 10.1.2.0/24, 1 successors, FD is 281600<br /> via Connected, FastEthernet0/0<br />P 10.1.25.0/24, 1 successors, FD is 281600<br /> via Connected, FastEthernet0/1<br />P 10.1.24.0/24, 1 successors, FD is 21049600<br /> via 10.1.2.3 (21049600/21024000), FastEthernet0/0<br />P 10.1.24.0/30, 1 successors, FD is 20512000<br /> via Connected, Serial0/0<br />P 10.1.34.0/24, 1 successors, FD is 10537472<br /> via 10.1.2.3 (10537472/10511872), FastEthernet0/0<br /> via 10.1.24.1 (21024000/10511872), Serial0/0<br />P 192.168.2.0/24, 1 successors, FD is 10537472<br />If we make the varience value 2, it will provide us to use 2 times bigger FD of FS to use traffic.<br />

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