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Eigrp Basics

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eigrp basics

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.
  • Transcript

    • 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.