EIGRP – www.expertcisco.fr

EIGRP Default Information

Fred J. — Sun, 06 May 2012 10:52:59 +0000

Configuration d`une interface lo10 et annonce en tant que « default network » :

BB3(config)#int lo10
BB3(config-if)#ip address 33.33.33.33 255.0.0.0

BB3(config)#ip default-network 33.0.0.0

Vérifications:

BB3#show ip route 33.33.33.0
Routing entry for 33.0.0.0/8
  Known via "connected", distance 0, metric 0 (connected, via interface), candidate def
ault path
  Redistributing via eigrp 300
  Routing Descriptor Blocks:
  * directly connected, via Loopback10
      Route metric is 0, traffic share count is 1

  
BB3#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, 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

     1.0.0.0/24 is subnetted, 1 subnets
D EX    1.1.1.0 [175/20665600] via 10.1.113.3, 00:08:53, Ethernet0
     2.0.0.0/24 is subnetted, 1 subnets
D EX    2.2.2.0 [175/2561049856] via 10.1.113.3, 00:08:53, Ethernet0
C* 33.0.0.0/8 is directly connected, Loopback10
     3.0.0.0/24 is subnetted, 1 subnets
D       3.3.3.0 [95/409600] via 10.1.113.3, 00:08:57, Ethernet0
     4.0.0.0/24 is subnetted, 1 subnets
D       4.4.4.0 [95/21177600] via 10.1.113.3, 00:08:53, Ethernet0
     113.0.0.0/24 is subnetted, 3 subnets
C       113.2.2.0 is directly connected, Loopback2
C       113.1.1.0 is directly connected, Loopback1
C       113.0.0.0 is directly connected, Loopback0
     112.0.0.0/32 is subnetted, 3 subnets
D EX    112.2.2.112 [175/2561049856] via 10.1.113.3, 00:08:55, Ethernet0
D EX    112.1.1.112 [175/2561049856] via 10.1.113.3, 00:08:55, Ethernet0
D EX    112.0.0.112 [175/2561049856] via 10.1.113.3, 00:08:55, Ethernet0
     111.0.0.0/24 is subnetted, 3 subnets
D EX    111.2.2.0 [175/20668160] via 10.1.113.3, 00:08:55, Ethernet0
D EX    111.1.1.0 [175/20668160] via 10.1.113.3, 00:08:55, Ethernet0
D EX    111.0.0.0 [175/20668160] via 10.1.113.3, 00:08:55, Ethernet0
     10.0.0.0/24 is subnetted, 7 subnets
D       10.1.14.0 [95/21049600] via 10.1.113.3, 00:08:55, Ethernet0
D       10.1.13.0 [95/20537600] via 10.1.113.3, 00:08:59, Ethernet0
D       10.1.12.0 [95/21049600] via 10.1.113.3, 00:08:55, Ethernet0
D EX    10.1.111.0 [175/20540160] via 10.1.113.3, 00:08:55, Ethernet0
D       10.1.100.0 [95/20537600] via 10.1.113.3, 00:08:59, Ethernet0
C       10.1.113.0 is directly connected, Ethernet0
D EX    10.1.112.0 [175/2561049856] via 10.1.113.3, 00:08:56, Ethernet0

Par défaut, l`information de route par défaut est propagée :

BB1#show ip route eigrp | inc 33.
D*EX    33.0.0.0 [170/2326016] via 10.1.111.1, 00:05:25, Ethernet0

Configuration de R1 afin de ne pas propager l`information ‘default’ :

R3(config)#router eigrp 300
R3(config-router)#no default-information allowed out

R3#clear ip eigrp neighbors

Vérification :

BB1#show ip route eigrp | inc 33.
D EX 33.0.0.0/8 [170/2326016] via 10.1.111.1, 00:01:52, Ethernet0

Acces-list

Mise en place d`une access-list pour n`autoriser que les sous réseau légitime

R3(config)#access-list 3 permit 33.0.0.0
R3(config)#router eigrp 300
R3(config-router)#default-information allowed in 3

vérifications :

R3#show ip route eigrp | inc 33
D*   33.0.0.0/8 [90/156160] via 10.1.113.113, 00:00:01, FastEthernet0/0

R3(config)#no access-list 3
R3(config)#access-list 3 permit 44.0.0.0
R3#clear ip eigrp neighbors

R3#show ip route eigrp | inc 33
D    33.0.0.0/8 [90/156160] via 10.1.113.113, 00:00:39, FastEthernet0/0

EIGRP STUB

Fred J. — Sun, 06 May 2012 10:44:52 +0000

Les AS 100, 200, 300 et 400 redistribuent leurs tables de routage :

BB3#show ip route eigrp
     1.0.0.0/24 is subnetted, 1 subnets
D EX    1.1.1.0 [175/20665600] via 10.1.113.3, 00:29:22, Ethernet0
     2.0.0.0/24 is subnetted, 1 subnets
D EX    2.2.2.0 [175/21177600] via 10.1.113.3, 00:17:21, Ethernet0
     3.0.0.0/24 is subnetted, 1 subnets
D       3.3.3.0 [95/409600] via 10.1.113.3, 00:29:22, Ethernet0
     4.0.0.0/24 is subnetted, 1 subnets
D       4.4.4.0 [95/21177600] via 10.1.113.3, 00:29:22, Ethernet0
     5.0.0.0/24 is subnetted, 1 subnets
D EX    5.5.5.0 [175/21689600] via 10.1.113.3, 00:15:17, Ethernet0
     6.0.0.0/24 is subnetted, 1 subnets
D EX    6.6.6.0 [175/21689600] via 10.1.113.3, 00:15:17, Ethernet0
     112.0.0.0/24 is subnetted, 3 subnets
D EX    112.2.2.0 [175/21180160] via 10.1.113.3, 00:01:49, Ethernet0
D EX    112.1.1.0 [175/21180160] via 10.1.113.3, 00:01:49, Ethernet0
D EX    112.0.0.0 [175/21180160] via 10.1.113.3, 00:01:49, Ethernet0
     111.0.0.0/24 is subnetted, 3 subnets
D EX    111.2.2.0 [175/20668160] via 10.1.113.3, 00:29:22, Ethernet0
D EX    111.1.1.0 [175/20668160] via 10.1.113.3, 00:29:23, Ethernet0
D EX    111.0.0.0 [175/20668160] via 10.1.113.3, 00:29:23, Ethernet0
     10.0.0.0/24 is subnetted, 8 subnets
D       10.1.14.0 [95/21049600] via 10.1.113.3, 00:29:23, Ethernet0
D       10.1.12.0 [95/21049600] via 10.1.113.3, 00:29:23, Ethernet0
D EX    10.1.44.0 [175/21561600] via 10.1.113.3, 00:15:19, Ethernet0
D EX    10.1.111.0 [175/20540160] via 10.1.113.3, 00:29:24, Ethernet0
D       10.1.100.0 [95/20537600] via 10.1.113.3, 00:29:24, Ethernet0
D EX    10.1.112.0 [175/21052160] via 10.1.113.3, 00:17:23, Ethernet0
D EX    10.1.156.0 [175/21564160] via 10.1.113.3, 00:15:19, Ethernet0

Configuration de R3 en « Stub Connected »

R3(config)#router eigrp 300
R3(config-router)#eigrp stub ?
  connected      Do advertise connected routes
  leak-map       Allow dynamic prefixes based on the leak-map
  receive-only   Set IP-EIGRP as receive only neighbor
  redistributed  Do advertise redistributed routes
  static         Do advertise static routes
  summary        Do advertise summary routes

R3(config)#router eigrp 300
R3(config-router)#eigrp stub connected

R3 n`annonce que les routes connectées :

BB3#show ip route eigrp
     3.0.0.0/24 is subnetted, 1 subnets
D       3.3.3.0 [95/409600] via 10.1.113.3, 00:05:55, Ethernet0
     10.0.0.0/24 is subnetted, 4 subnets
D       10.1.13.0 [95/20537600] via 10.1.113.3, 00:03:07, Ethernet0
D       10.1.100.0 [95/20537600] via 10.1.113.3, 00:05:55, Ethernet0

Utilisation d`une « route-map » et « leak-map » pour annoncer quelques sous-réseau :

R3(config)#access-list 1 permit 10.1.156.0 0.0.0.255
R3(config)#access-list 1 permit 113.0.0.0 0.0.0.255

R3(config)#route-map TEST permit 10
R3(config-route-map)#match ip address 1

R3(config)#router eigrp 300
R3(config-router)#eigrp stub connected leak-map TEST

Vérifications

BB3#show ip route e
     3.0.0.0/24 is subnetted, 1 subnets
D       3.3.3.0 [95/409600] via 10.1.113.3, 00:01:24, Ethernet0
     10.0.0.0/24 is subnetted, 4 subnets
D       10.1.13.0 [95/20537600] via 10.1.113.3, 00:01:24, Ethernet0
D       10.1.100.0 [95/20537600] via 10.1.113.3, 00:01:24, Ethernet0
D EX    10.1.156.0 [175/21564160] via 10.1.113.3, 00:01:24, Ethernet0

BB3#ping 10.1.156.6 source 113.0.0.113

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.156.6, timeout is 2 seconds:
Packet sent with a source address of 113.0.0.113
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 172/172/172 ms

l`interface utilise pour les annonce peut être spécifiée dans le route map :

R3(config)#route-map TEST 10
R3(config-route-map)#match ip address 1
R3(config-route-map)#match interface fa0/0

EIGRP route tag

Fred J. — Sun, 06 May 2012 10:34:18 +0000

l`AS 400 redistribue ces routes dans l`AS 300 en les taguant :

R4(config)#route-map Redis-400-300 permit 10
R4(config-route-map)#set tag 400

R4(config)#router eigrp 300
R4(config-router)#redistribute eigrp 400 route-map Redis-400-300

Vérifications :

BB3#show ip route 10.1.156.0
Routing entry for 10.1.156.0/24
  Known via "eigrp 300", distance 175, metric 21564160
  Tag 400, type external
  Redistributing via eigrp 300
  Last update from 10.1.113.3 on Ethernet0, 00:00:01 ago
  Routing Descriptor Blocks:
  * 10.1.113.3, from 10.1.113.3, 00:00:01 ago, via Ethernet0
      Route metric is 21564160, traffic share count is 1
      Total delay is 61100 microseconds, minimum bandwidth is 128 Kbit
      Reliability 255/255, minimum MTU 1500 bytes
      Loading 1/255, Hops 4

Distance administrative EIGRP

Fred J. — Sun, 06 May 2012 10:27:41 +0000

Modification des distances administratives du protocole EIGRP.

par défaut :

90 pour les routes Internes
170 pour les routes Externes

BB3#show ip protocols | inc Dis
    Gateway         Distance      Last Update
  Distance: internal 90 external 170

  
BB3#show ip route eigrp
     1.0.0.0/24 is subnetted, 1 subnets
D EX    1.1.1.0 [170/20665600] via 10.1.113.3, 00:02:15, Ethernet0
     3.0.0.0/24 is subnetted, 1 subnets
D       3.3.3.0 [90/409600] via 10.1.113.3, 00:02:19, Ethernet0
     4.0.0.0/24 is subnetted, 1 subnets
D       4.4.4.0 [90/21177600] via 10.1.113.3, 00:02:15, Ethernet0
     111.0.0.0/24 is subnetted, 3 subnets
D EX    111.2.2.0 [170/20668160] via 10.1.113.3, 00:02:15, Ethernet0
D EX    111.1.1.0 [170/20668160] via 10.1.113.3, 00:02:15, Ethernet0
D EX    111.0.0.0 [170/20668160] via 10.1.113.3, 00:02:15, Ethernet0
     10.0.0.0/24 is subnetted, 5 subnets
D       10.1.14.0 [90/21049600] via 10.1.113.3, 00:02:15, Ethernet0
D       10.1.12.0 [90/21049600] via 10.1.113.3, 00:02:16, Ethernet0
D EX    10.1.111.0 [170/20540160] via 10.1.113.3, 00:02:16, Ethernet0
D       10.1.100.0 [90/20537600] via 10.1.113.3, 00:02:19, Ethernet0

Configuration

 
BB3(config)#router eigrp 300
BB3(config-router)#distance eigrp 95 175

vérification

 
BB3#show ip route eigrp
     1.0.0.0/24 is subnetted, 1 subnets
D EX    1.1.1.0 [175/20665600] via 10.1.113.3, 00:00:30, Ethernet0
     3.0.0.0/24 is subnetted, 1 subnets
D       3.3.3.0 [95/409600] via 10.1.113.3, 00:00:30, Ethernet0
     4.0.0.0/24 is subnetted, 1 subnets
D       4.4.4.0 [95/21177600] via 10.1.113.3, 00:00:30, Ethernet0
     111.0.0.0/24 is subnetted, 3 subnets
D EX    111.2.2.0 [175/20668160] via 10.1.113.3, 00:00:30, Ethernet0
D EX    111.1.1.0 [175/20668160] via 10.1.113.3, 00:00:30, Ethernet0
D EX    111.0.0.0 [175/20668160] via 10.1.113.3, 00:00:30, Ethernet0
     10.0.0.0/24 is subnetted, 5 subnets
D       10.1.14.0 [95/21049600] via 10.1.113.3, 00:00:30, Ethernet0
D       10.1.12.0 [95/21049600] via 10.1.113.3, 00:00:31, Ethernet0
D EX    10.1.111.0 [175/20540160] via 10.1.113.3, 00:00:31, Ethernet0
D       10.1.100.0 [95/20537600] via 10.1.113.3, 00:00:31, Ethernet0

Modification sélective de la distance administrative

R3(config)#access-list 10 permit 113.1.1.0 0.0.0.255
R3(config)#access-list 10 permit 113.2.2.0 0.0.0.255

R3(config)#router eigrp 300
R3(config-router)#distance 91 10.1.113.113 0.0.0.0 10

R3#show ip route eigrp
     1.0.0.0/24 is subnetted, 1 subnets
D EX    1.1.1.0 [170/20640000] via 10.1.13.1, 00:00:09, Serial1/0.31
     2.0.0.0/24 is subnetted, 1 subnets
D EX    2.2.2.0 [170/21152000] via 10.1.13.1, 00:00:09, Serial1/0.31
     4.0.0.0/24 is subnetted, 1 subnets
D       4.4.4.0 [90/21152000] via 10.1.13.1, 00:00:09, Serial1/0.31
     5.0.0.0/24 is subnetted, 1 subnets
D EX    5.5.5.0 [170/21664000] via 10.1.13.1, 00:00:09, Serial1/0.31
     113.0.0.0/24 is subnetted, 3 subnets
D       113.2.2.0 [91/156160] via 10.1.113.113, 00:00:11, FastEthernet0/0
D       113.1.1.0 [91/156160] via 10.1.113.113, 00:00:11, FastEthernet0/0
D       113.0.0.0 [90/156160] via 10.1.113.113, 00:00:11, FastEthernet0/0
     6.0.0.0/24 is subnetted, 1 subnets
D EX    6.6.6.0 [170/21664000] via 10.1.13.1, 00:00:09, Serial1/0.31
     112.0.0.0/24 is subnetted, 3 subnets
D EX    112.2.2.0 [170/21154560] via 10.1.13.1, 00:00:09, Serial1/0.31
D EX    112.1.1.0 [170/21154560] via 10.1.13.1, 00:00:09, Serial1/0.31
D EX    112.0.0.0 [170/21154560] via 10.1.13.1, 00:00:09, Serial1/0.31
     111.0.0.0/24 is subnetted, 3 subnets
D EX    111.2.2.0 [170/20642560] via 10.1.13.1, 00:00:09, Serial1/0.31
D EX    111.1.1.0 [170/20642560] via 10.1.13.1, 00:00:09, Serial1/0.31
D EX    111.0.0.0 [170/20642560] via 10.1.13.1, 00:00:09, Serial1/0.31
     10.0.0.0/24 is subnetted, 9 subnets
D       10.1.14.0 [90/21024000] via 10.1.13.1, 00:00:10, Serial1/0.31
D       10.1.12.0 [90/21024000] via 10.1.13.1, 00:00:10, Serial1/0.31
D EX    10.1.44.0 [170/21536000] via 10.1.13.1, 00:00:10, Serial1/0.31
D EX    10.1.111.0 [170/20514560] via 10.1.13.1, 00:00:10, Serial1/0.31
D EX    10.1.112.0 [170/21026560] via 10.1.13.1, 00:00:10, Serial1/0.31
D EX    10.1.156.0 [170/21538560] via 10.1.13.1, 00:00:10, Serial1/0.31

EIGRP maximum hopcount

Fred J. — Sun, 06 May 2012 10:25:40 +0000

Modification du nombre de saut max (par défaut : 100)

R3#show ip protocols
Routing Protocol is "eigrp 300"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
  EIGRP maximum hopcount 100
  EIGRP maximum metric variance 1
  Redistributing: eigrp 300
  EIGRP NSF-aware route hold timer is 240s
  Automatic network summarization is not in effect
  Maximum path: 4
  Routing for Networks:
    3.3.3.3/32
    10.1.100.0/24
    0.0.0.0
  Routing Information Sources:
    Gateway         Distance      Last Update
    10.1.13.1             90      00:17:47
    10.1.113.113          90      00:02:30
    10.1.100.1            90      00:02:30
  Distance: internal 90 external 170

R3(config)#router eigrp 300
R3(config-router)#metric maximum-hops 110

 
R3#show ip protocols
*Mar 15 11:06:48.631: %SYS-5-CONFIG_I: Configured from console by console
Routing Protocol is "eigrp 300"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
  EIGRP maximum hopcount 110
  EIGRP maximum metric variance 1
  Redistributing: eigrp 300
  EIGRP NSF-aware route hold timer is 240s
  Automatic network summarization is not in effect
  Maximum path: 4
  Routing for Networks:
    3.3.3.3/32
    10.1.100.0/24
    0.0.0.0
  Routing Information Sources:
    Gateway         Distance      Last Update
    10.1.13.1             90      00:20:07
    10.1.113.113          90      00:00:42
    10.1.100.1            90      00:00:42
  Distance: internal 90 external 170

Authentification Eigrp

Fred J. — Sun, 06 May 2012 10:22:36 +0000

Mise en place d`une authentification Eigrp entre R1 et R3

R3(config)#key chain R1-R3
R3(config-keychain)#key 1
R3(config-keychain-key)#key-string CISCO12345

R3(config)int s1/2
R3(config-if)#ip authentication key-chain eigrp 300 R1-R3
R3(config-if)#ip authentication mode eigrp 300 md5

R1(config)#key chain R1-R3
R1(config-keychain)#key 1
R1(config-keychain-key)#key-string CISCO12345

R1(config)int s0/1
R1(config-if)#ip authentication key-chain eigrp 300 R1-R3
R1(config-if)#ip authentication mode eigrp 300 md5

Vérifications :

R1#show ip eigrp interfaces detail s0/1
IP-EIGRP interfaces for process 100
                        Xmit Queue   Mean   Pacing Time   Multicast    Pending
Interface        Peers  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes
IP-EIGRP interfaces for process 300
                        Xmit Queue   Mean   Pacing Time   Multicast    Pending
Interface        Peers  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes
Se0/1              1        0/0        64       0/15         303           0
  Hello interval is 5 sec
  Next xmit serial 
  Un/reliable mcasts: 0/0  Un/reliable ucasts: 5/15
  Mcast exceptions: 0  CR packets: 0  ACKs suppressed: 3
  Retransmissions sent: 1  Out-of-sequence rcvd: 0
  Authentication mode is md5, key-chain is "R1-R3"
  Use unicast

EIGRP loadbalancing

Fred J. — Sun, 06 May 2012 10:17:27 +0000

Le routeur R4 n`utilise qu`un seul next hop pour atteindre le sous-réseau 6.6.6.0/24 :

R4#show ip route eigrp 400
     5.0.0.0/24 is subnetted, 1 subnets
D       5.5.5.0 [90/2297856] via 10.1.44.5, 01:48:32, Serial0/0
     6.0.0.0/24 is subnetted, 1 subnets
D       6.6.6.0 [90/2297856] via 10.1.44.6, 01:48:32, Serial0/0
     10.0.0.0/24 is subnetted, 7 subnets
D       10.1.156.0 [90/2172416] via 10.1.44.6, 01:48:32, Serial0/0
                   [90/2172416] via 10.1.44.5, 01:48:32, Serial0/0

La topologie EIGRP indique 2 routes possibles vers le sous-réseau 6.6.6.0/24 :

R4#show ip eigrp 400 topology 6.6.6.0/24
IP-EIGRP (AS 400): Topology entry for 6.6.6.0/24
  State is Passive, Query origin flag is 1, 1 Successor(s), FD is 2297856
  Routing Descriptor Blocks:
  10.1.44.6 (Serial0/0), from 10.1.44.6, Send flag is 0x0
      Composite metric is (2297856/128256), Route is Internal
      Vector metric:
        Minimum bandwidth is 1544 Kbit
        Total delay is 25000 microseconds
        Reliability is 255/255
        Load is 1/255
        Minimum MTU is 1500
        Hop count is 1
  10.1.44.5 (Serial0/0), from 10.1.44.5, Send flag is 0x0
      Composite metric is (2300416/156160), Route is Internal
      Vector metric:
        Minimum bandwidth is 1544 Kbit
        Total delay is 25100 microseconds
        Reliability is 255/255
        Load is 1/255
        Minimum MTU is 1500
        Hop count is 2

Le ratio entre les 2 metric est de 1,001 ( 2300416 / 2297856 )
La variance doit être donc de 2 pour loadbalancer entre les 2 liens :

R4(config)#router eigrp 400
R4(config-router)#variance 2

Vérifications :

R4#show ip route eigrp 400
     5.0.0.0/24 is subnetted, 1 subnets
D       5.5.5.0 [90/2300416] via 10.1.44.6, 00:00:43, Serial0/0
                [90/2297856] via 10.1.44.5, 00:00:43, Serial0/0
     6.0.0.0/24 is subnetted, 1 subnets
D       6.6.6.0 [90/2297856] via 10.1.44.6, 00:00:43, Serial0/0
                [90/2300416] via 10.1.44.5, 00:00:43, Serial0/0
     10.0.0.0/24 is subnetted, 7 subnets
D       10.1.156.0 [90/2172416] via 10.1.44.6, 00:00:43, Serial0/0
                   [90/2172416] via 10.1.44.5, 00:00:43, Serial0/0

EIGRP summarisation

Fred J. — Sun, 06 May 2012 10:14:55 +0000

R2#show ip route eigrp 300
     1.0.0.0/24 is subnetted, 1 subnets
D EX    1.1.1.0 [170/2297856] via 10.1.12.1, 01:33:55, Serial0/0
     3.0.0.0/24 is subnetted, 1 subnets
D       3.3.3.0 [90/2809856] via 10.1.12.1, 01:33:55, Serial0/0
     4.0.0.0/24 is subnetted, 1 subnets
D       4.4.4.0 [90/2809856] via 10.1.12.1, 01:33:55, Serial0/0
     113.0.0.0/24 is subnetted, 3 subnets
D       113.2.2.0 [90/2812416] via 10.1.12.1, 01:33:37, Serial0/0
D       113.1.1.0 [90/2812416] via 10.1.12.1, 01:33:37, Serial0/0
D       113.0.0.0 [90/2812416] via 10.1.12.1, 01:33:37, Serial0/0
     111.0.0.0/24 is subnetted, 3 subnets
D EX    111.2.2.0 [170/2300416] via 10.1.12.1, 00:07:13, Serial0/0
D EX    111.1.1.0 [170/2300416] via 10.1.12.1, 00:07:13, Serial0/0
D EX    111.0.0.0 [170/2300416] via 10.1.12.1, 00:07:13, Serial0/0
     10.0.0.0/24 is subnetted, 6 subnets
D       10.1.14.0 [90/2681856] via 10.1.12.1, 01:33:55, Serial0/0
D       10.1.13.0 [90/2681856] via 10.1.12.1, 01:33:55, Serial0/0
D EX    10.1.111.0 [170/2172416] via 10.1.12.1, 01:33:57, Serial0/0
D       10.1.113.0 [90/2684416] via 10.1.12.1, 01:33:57, Serial0/0

Configuration :

R1(config)#int s0/0.12
R1(config-subif)#ip summary-address eigrp 300 111.0.0.0 255.0.0.0
R1(config-subif)#ip summary-address eigrp 300 10.0.0.0 255.0.0.0

Vérifications :

R2#show ip route eigrp 300
     1.0.0.0/24 is subnetted, 1 subnets
D EX    1.1.1.0 [170/2297856] via 10.1.12.1, 00:00:48, Serial0/0
     3.0.0.0/24 is subnetted, 1 subnets
D       3.3.3.0 [90/2809856] via 10.1.12.1, 00:00:48, Serial0/0
     4.0.0.0/24 is subnetted, 1 subnets
D       4.4.4.0 [90/2809856] via 10.1.12.1, 00:00:48, Serial0/0
     113.0.0.0/24 is subnetted, 3 subnets
D       113.2.2.0 [90/2812416] via 10.1.12.1, 00:00:48, Serial0/0
D       113.1.1.0 [90/2812416] via 10.1.12.1, 00:00:48, Serial0/0
D       113.0.0.0 [90/2812416] via 10.1.12.1, 00:00:48, Serial0/0
D    111.0.0.0/8 [90/2300416] via 10.1.12.1, 00:00:48, Serial0/0
     10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
D       10.0.0.0/8 [90/2172416] via 10.1.12.1, 00:00:31, Serial0/0

Calcul du metric EIGRP

Fred J. — Sun, 06 May 2012 10:06:25 +0000

Le calcul du metric EIGRP est le résultat composite de 5 paramétrés :

La bande passante
La Charge
Le Délais
La Fiabilité

Par défaut, K1 et K3 sont à 1, et le reste à zéro, réduisant la formule à :

R1#show ip protocols
Routing Protocol is "eigrp 100"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
  EIGRP maximum hopcount 100
  EIGRP maximum metric variance 1
  Redistributing: eigrp 100, eigrp 300
  EIGRP NSF-aware route hold timer is 240s
  Automatic network summarization is not in effect
  Maximum path: 4
  Routing for Networks:
    1.1.1.1/32
    10.1.111.1/32
  Routing Information Sources:
    Gateway         Distance      Last Update
    10.1.111.111          90      00:42:05
  Distance: internal 90 external 170

Exemple :

Pour atteindre l`IP 111.1.1.111 depuis R1, il nécessaire de traverser l`interface fa0/0 de R1 et l`interface Lo0 de BB1

R1#show int fa0/0 | inc MTU
  MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,

BB1#show interfaces lo0 | inc MTU
  MTU 1514 bytes, BW 8000000 Kbit, DLY 5000 usec,

la plus petite bande passante est utilisée (celle de fa0/0)
les delay sont additionnés

METRIC = 256 * (10000000 / 100000) + ( (5000 + 100) / 10 )
METRIC = 156160

R1#show ip route 111.1.1.0
Routing entry for 111.1.1.0/24
  Known via "eigrp 100", distance 90, metric 156160, type internal
  Redistributing via eigrp 100, eigrp 300
  Advertised by eigrp 300
  Last update from 10.1.111.111 on FastEthernet0/0, 00:31:18 ago
  Routing Descriptor Blocks:
  * 10.1.111.111, from 10.1.111.111, 00:31:18 ago, via FastEthernet0/0
      Route metric is 156160, traffic share count is 1
      Total delay is 5100 microseconds, minimum bandwidth is 100000 Kbit
      Reliability 255/255, minimum MTU 1500 bytes
      Loading 1/255, Hops 1

Pour ne plus prendre en considération le délai, il suffit de mettre K3 a 0 :

R1(config)#router eigrp 100
R1(config-router)#metric weights 0 1 0 0 0 0

*Feb 19 21:02:49.767: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 10.1.111.111 (FastEt
hernet0/0) is down: metric changed
*Feb 19 21:02:50.351: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 10.1.111.111 (FastEt
hernet0/0) is down: K-value mismatch

Vérifications :

R1#show ip protocols
Routing Protocol is "eigrp 100"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP metric weight K1=1, K2=0, K3=0, K4=0, K5=0
  EIGRP maximum hopcount 100
  EIGRP maximum metric variance 1
  Redistributing: eigrp 100, eigrp 300
  EIGRP NSF-aware route hold timer is 240s
  Automatic network summarization is not in effect
  Maximum path: 4
  Routing for Networks:
    1.1.1.1/32
    10.1.111.1/32
  Routing Information Sources:
    Gateway         Distance      Last Update
    10.1.111.111          90      00:00:11
  Distance: internal 90 external 170

R1#show ip route eigrp 100
     111.0.0.0/24 is subnetted, 3 subnets
D       111.2.2.0 [90/25600] via 10.1.111.111, 00:02:17, FastEthernet0/0
D       111.1.1.0 [90/25600] via 10.1.111.111, 00:02:17, FastEthernet0/0
D       111.0.0.0 [90/25600] via 10.1.111.111, 00:02:17, FastEthernet0/0

EIGRP Timers

Fred J. — Sun, 06 May 2012 10:03:07 +0000

modification des timers « hello » et « hold-time » entre BB1 et R1

R1(config)#int fa0/0
R1(config-if)#ip hello-interval eigrp 100 1
R1(config-if)#ip hold-time eigrp 100 3

BB1(config)#int e0
BB1(config-if)#ip hello-interval eigrp 100 1
BB1(config-if)#ip hold-time eigrp 100 3

Vérifications :

R1#sh ip eigrp interfaces detail 100 fa0/0
IP-EIGRP interfaces for process 100
                        Xmit Queue   Mean   Pacing Time   Multicast    Pending
Interface        Peers  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes
Fa0/0              1        0/0       912       0/1         4544           0
  Hello interval is 1 sec
  Next xmit serial 
  Un/reliable mcasts: 0/12  Un/reliable ucasts: 17/26
  Mcast exceptions: 9  CR packets: 6  ACKs suppressed: 0
  Retransmissions sent: 12  Out-of-sequence rcvd: 0
  Authentication mode is not set
  Use multicast