eigrp basics

1. EIGRP Alp ISIK Netas 2010

2. Why Do We choose EIGRP Backup Routes (fast convergence, Dual) Flexibility in summarization * Unequal cost load-balancing, it’s unique to EIGRP. Combines of Distance Vector and Link State R2 Primary R1 X 192.168.1.0/24 R3

3. EIGRP Tables Neighbor Table Topology Table Routing Table

4. EIGRP Terminologies 1 Feasible Distance (FD) Advertised distance (AD) 192.168.1.0/24 R1 R2 200 100 R4 R3 10 10 192.168.2.0/24 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)

5. EIGRP Terminologies 2 Successor (Primary Route) Feasible Successor(s) [Backup Route(s)] : Router 4 uzerindengidenyol. Active Route (Actively trying to find a backup) Passive Route

6. EIGRP Neighborhood Hello : forms relationship, send to 224.0.0.10. Update : Sends Routing table Query : Ask about routes Reply : Response of Query Ack : Act to every update, query, response

7. EIGRP Metric Calculation Bandwitdh Delay Reliability Loading MTU (send at neighbor update but not affect metric) These are also known as K values.

8. EIGRP Implementetion Configured for GNS3, attached at the end of the Doc

9. EIGRP Topology R1(config)#do show ip eigrp topo IP-EIGRP Topology Table for AS(90)/ID(172.30.8.1) Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P 10.1.2.0/24, 1 successors, FD is 307200 via 10.1.34.2 (10051072/281600), FastEthernet0/1 via 10.1.24.2 (20051200/281600), FastEthernet0/0 P 10.1.24.0/30, 1 successors, FD is 20025600 via Connected, FastEthernet0/0 P 10.1.34.0/30, 1 successors, FD is 10025472 via Connected, FastEthernet0/1 P 172.30.2.0/24, 1 successors, FD is 128256 via Connected, Loopback2 P 172.30.3.0/24, 1 successors, FD is 128256 via Connected, Loopback3 P 172.30.0.0/24, 1 successors, FD is 128256 via Connected, Loopback0 P 172.30.1.0/24, 1 successors, FD is 128256 via Connected, Loopback1 P 172.30.6.0/24, 1 successors, FD is 128256 via Connected, Loopback6 P 172.30.7.0/24, 1 successors, FD is 128256 Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status via Connected, Loopback7 P 172.30.4.0/24, 1 successors, FD is 128256 via Connected, Loopback4 P 172.30.5.0/24, 1 successors, FD is 128256 via Connected, Loopback5 P 172.30.8.0/24, 1 successors, FD is 128256 via Connected, Loopback8 Feasible distance Adverticed distance

10. EIGRP Topology R1(config-router)#do show ip eigrp topo IP-EIGRP Topology Table for AS(90)/ID(172.30.8.1) Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P 10.1.2.0/24, 1 successors, FD is 10051072 via 10.1.34.2 (10051072/281600), FastEthernet0/1 via 10.1.24.2 (20051200/281600), FastEthernet0/0 P 10.1.25.0/24, 1 successors, FD is 10179072 via 10.1.34.2 (10179072/409600), FastEthernet0/1 via 10.1.24.2 (20153600/128256), FastEthernet0/0 P 10.1.24.0/30, 1 successors, FD is 20025600 via Connected, FastEthernet0/0 P 10.1.34.0/30, 1 successors, FD is 10025472 via Connected, FastEthernet0/1 P 192.168.1.0/24, 1 successors, FD is 256 via Rstatic (256/0) P 172.30.2.0/24, 1 successors, FD is 128256 via Connected, Loopback2 P 172.30.3.0/24, 1 successors, FD is 128256 via Connected, Loopback3 P 172.30.0.0/24, 1 successors, FD is 128256 via Connected, Loopback0 Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P 172.30.1.0/24, 1 successors, FD is 128256 via Connected, Loopback1 P 172.30.6.0/24, 1 successors, FD is 128256 via Connected, Loopback6 P 172.30.7.0/24, 1 successors, FD is 128256 via Connected, Loopback7 P 172.30.4.0/24, 1 successors, FD is 128256 via Connected, Loopback4 P 172.30.5.0/24, 1 successors, FD is 128256 via Connected, Loopback5 P 172.30.8.0/24, 1 successors, FD is 128256 via Connected, Loopback8 Redistributed static route

11. Changed the network as below

12. EIGRP Topology (Used serial at R1) instead of FE. BB#show ip eigrp topo IP-EIGRP Topology Table for AS(90)/ID(172.30.8.1) Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P 10.1.2.0/24, 1 successors, FD is 10537472 via 10.1.34.2 (10537472/281600), Serial0/1 via 10.1.24.2 (20537600/281600), Serial0/0 P 10.1.25.0/24, 1 successors, FD is 10563072 via 10.1.34.2 (10563072/307200), Serial0/1 via 10.1.24.2 (20537600/281600), Serial0/0 P 10.1.24.0/24, 1 successors, FD is 21049600 via 10.1.34.2 (21049600/20537600), Serial0/1 P 10.1.24.0/30, 1 successors, FD is 20512000 via Connected, Serial0/0 P 10.1.34.0/30, 1 successors, FD is 10511872 via Connected, Serial0/1 P 172.30.2.0/24, 1 successors, FD is 128256 via Connected, Loopback2 P 172.30.3.0/24, 1 successors, FD is 128256 via Connected, Loopback3 P 172.30.0.0/24, 1 successors, FD is 128256 via Connected, Loopback0 Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P 172.30.1.0/24, 1 successors, FD is 128256 via Connected, Loopback1 P 172.30.6.0/24, 1 successors, FD is 128256 via Connected, Loopback6 P 172.30.7.0/24, 1 successors, FD is 128256 via Connected, Loopback7 P 172.30.4.0/24, 1 successors, FD is 128256 via Connected, Loopback4 P 172.30.5.0/24, 1 successors, FD is 128256 via Connected, Loopback5 P 172.30.8.0/24, 1 successors, FD is 128256 via Connected, Loopback8

13. EIGRP Routes R3(config-router)#do show ip route Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route Gateway of last resort is not set 172.30.0.0/24 is subnetted, 9 subnets D 172.30.2.0 [90/10639872] via 10.1.34.1, 00:01:07, Serial0/1 D 172.30.3.0 [90/10639872] via 10.1.34.1, 00:01:07, Serial0/1 D 172.30.0.0 [90/10639872] via 10.1.34.1, 00:01:07, Serial0/1 D 172.30.1.0 [90/10639872] via 10.1.34.1, 00:01:07, Serial0/1 D 172.30.6.0 [90/10639872] via 10.1.34.1, 00:01:07, Serial0/1 D 172.30.7.0 [90/10639872] via 10.1.34.1, 00:01:07, Serial0/1 D 172.30.4.0 [90/10639872] via 10.1.34.1, 00:01:07, Serial0/1 D 172.30.5.0 [90/10639872] via 10.1.34.1, 00:01:07, Serial0/1 D 172.30.8.0 [90/10639872] via 10.1.34.1, 00:01:07, Serial0/1 10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks C 10.1.2.0/24 is directly connected, FastEthernet0/0 D 10.1.25.0/24 [90/307200] via 10.1.2.2, 00:01:23, FastEthernet0/0 R3(config-router)#do show ip eigrp nei IP-EIGRP neighbors for process 90 H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 1 10.1.34.1 Se0/1 11 00:02:36 674 4044 0 5 0 10.1.2.2 Fa0/0 13 00:02:52 659 3954 0 9

14. Ip-default network command 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. BB(config)#do show ip route Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route Gateway of last resort is not set 172.30.0.0/24 is subnetted, 9 subnets C 172.30.2.0 is directly connected, Loopback2 C 172.30.3.0 is directly connected, Loopback3 C 172.30.0.0 is directly connected, Loopback0 C 172.30.1.0 is directly connected, Loopback1 C 172.30.6.0 is directly connected, Loopback6 C 172.30.7.0 is directly connected, Loopback7 C 172.30.4.0 is directly connected, Loopback4 C 172.30.5.0 is directly connected, Loopback5 C 172.30.8.0 is directly connected, Loopback8 10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks D 10.1.2.0/24 [90/10537472] via 10.1.34.2, 00:06:26, Serial0/1 D 10.1.25.0/24 [90/10563072] via 10.1.34.2, 00:06:26, Serial0/1 D 10.1.24.0/30 [90/21049600] via 10.1.34.2, 00:06:27, Serial0/1 C 10.1.24.0/24 is directly connected, Serial0/0 C 10.1.34.0/24 is directly connected, Serial0/1 S* 192.168.2.0/24 is directly connected, Null0 Means candidate default

15. Ip-default network command It’s passing to other’s with * as well. R2(config)#do show ip route Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route Gateway of last resort is 10.1.2.3 to network 192.168.2.0 172.30.0.0/24 is subnetted, 9 subnets D 172.30.2.0 [90/10665472] via 10.1.2.3, 00:00:23, FastEthernet0/0 D 172.30.3.0 [90/10665472] via 10.1.2.3, 00:00:23, FastEthernet0/0 D 172.30.0.0 [90/10665472] via 10.1.2.3, 00:00:23, FastEthernet0/0 D 172.30.1.0 [90/10665472] via 10.1.2.3, 00:00:23, FastEthernet0/0 D 172.30.6.0 [90/10665472] via 10.1.2.3, 00:00:23, FastEthernet0/0 D 172.30.7.0 [90/10665472] via 10.1.2.3, 00:00:23, FastEthernet0/0 D 172.30.4.0 [90/10665472] via 10.1.2.3, 00:00:23, FastEthernet0/0 D 172.30.5.0 [90/10665472] via 10.1.2.3, 00:00:23, FastEthernet0/0 D 172.30.8.0 [90/10665472] via 10.1.2.3, 00:00:23, FastEthernet0/0 10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks C 10.1.2.0/24 is directly connected, FastEthernet0/0 C 10.1.25.0/24 is directly connected, FastEthernet0/1 C 10.1.24.0/30 is directly connected, Serial0/0 D 10.1.24.0/24 [90/21049600] via 10.1.2.3, 00:11:32, FastEthernet0/0 D 10.1.34.0/24 [90/10537472] via 10.1.2.3, 00:00:24, FastEthernet0/0 D* 192.168.2.0/24 [90/10537472] via 10.1.2.3,

16. Summurizing the loopback addresses at BB Both for S0/0 and S0/1 BB(config-if)#ip summary-address eigrp 90 172.30.0.0 255.255.248.0 Then we see the routes as below : R3#show ip route Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route Gateway of last resort is 10.1.34.1 to network 192.168.2.0 172.30.0.0/16 is variably subnetted, 2 subnets, 2 masks D 172.30.0.0/21 [90/10639872] via 10.1.34.1, 00:00:25, Serial0/1 D 172.30.8.0/24 [90/10639872] via 10.1.34.1, 00:00:25, Serial0/1 10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks C 10.1.2.0/24 is directly connected, FastEthernet0/0 D 10.1.25.0/24 [90/307200] via 10.1.2.2, 00:09:20, FastEthernet0/0 D 10.1.24.0/30 [90/20537600] via 10.1.2.2, 00:09:20, FastEthernet0/0 D 10.1.24.0/24 [90/21024000] via 10.1.34.1, 00:00:26, Serial0/1 C 10.1.34.0/24 is directly connected, Serial0/1 D* 192.168.2.0/24 [90/10511872] via 10.1.34.1, 00:00:25, Serial0/1 R3#

17. Varience Command, load balancing Via Varience command we can ensure load balancing R2(config-router)#do show ipeigrptopo IP-EIGRP Topology Table for AS(90)/ID(10.1.25.2) Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P 10.1.2.0/24, 1 successors, FD is 281600 via Connected, FastEthernet0/0 P 10.1.25.0/24, 1 successors, FD is 281600 via Connected, FastEthernet0/1 P 10.1.24.0/24, 1 successors, FD is 21049600 via 10.1.2.3 (21049600/21024000), FastEthernet0/0 P 10.1.24.0/30, 1 successors, FD is 20512000 via Connected, Serial0/0 P 10.1.34.0/24, 1 successors, FD is 10537472 via 10.1.2.3 (10537472/10511872), FastEthernet0/0 via 10.1.24.1 (21024000/10511872), Serial0/0 P 192.168.2.0/24, 1 successors, FD is 10537472 If we make the varience value 2, it will provide us to use 2 times bigger FD of FS to use traffic.