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2025-01-16 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Network Security >
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Shulou(Shulou.com)06/01 Report--
1. Experimental Topology
2. Main matters
Summary routing is done on the outgoing and receiving of the route.
The cost of the summary route takes the minimum expense value of the detail route.
The router that configures automatic summarization automatically points the summary route to Null 0
Only the last detail route downhou, the summary route disappears.
3. Basic configuration
R2
Interface Loopback0
Ip address 192.168.0.1 255.255.255.0
Interface Loopback1
Ip address 192.168.1.1 255.255.255.0
Interface Loopback2
Ip address 192.168.2.1 255.255.255.0
Interface Loopback3
Ip address 192.168.3.1 255.255.255.0
Interface Serial0/1
Ip address 23.1.1.2 255.255.255.0
Router eigrp 90
Network 23.1.1.0 0.0.0.255
Network 192.168.0.0 0.0.255.255
No auto-summary
R3
Interface Serial0/0
Ip address 34.1.1.3 255.255.255.0
Interface Serial0/1
Ip address 23.1.1.3 255.255.255.0
Router eigrp 90
Network 23.1.1.0 0.0.0.255
Network 34.1.1.0 0.0.0.255
No auto-summary
R4
Interface Serial0/0
Ip address 34.1.1.4 255.255.255.0
Router eigrp 90
Network 34.1.1.0 0.0.0.255
No auto-summary
4. Route before summarization
R2#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
34.0.0.0/24 is subnetted, 1 subnets
D 34.1.1.0 [90/2681856] via 23.1.1.3, 00:43:00, Serial0/1
23.0.0.0/24 is subnetted, 1 subnets
C 23.1.1.0 is directly connected, Serial0/1
C 192.168.0.0/24 is directly connected, Loopback0
C 192.168.1.0/24 is directly connected, Loopback1
C 192.168.2.0/24 is directly connected, Loopback2
C 192.168.3.0/24 is directly connected, Loopback3
R2#
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 not set
34.0.0.0/24 is subnetted, 1 subnets
C 34.1.1.0 is directly connected, Serial0/0
23.0.0.0/24 is subnetted, 1 subnets
C 23.1.1.0 is directly connected, Serial0/1
D 192.168.0.0/24 [90/2297856] via 23.1.1.2, 00:01:51, Serial0/1
D 192.168.1.0/24 [90/2297856] via 23.1.1.2, 00:01:51, Serial0/1
D 192.168.2.0/24 [90/2297856] via 23.1.1.2, 00:01:51, Serial0/1
D 192.168.3.0/24 [90/2297856] via 23.1.1.2, 00:01:51, Serial0/1
R3#
R4#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
34.0.0.0/24 is subnetted, 1 subnets
C 34.1.1.0 is directly connected, Serial0/0
23.0.0.0/24 is subnetted, 1 subnets
D 23.1.1.0 [90/2681856] via 34.1.1.3, 00:42:41, Serial0/0
D 192.168.0.0/24 [90/2809856] via 34.1.1.3, 00:01:58, Serial0/0
D 192.168.1.0/24 [90/2809856] via 34.1.1.3, 00:01:58, Serial0/0
D 192.168.2.0/24 [90/2809856] via 34.1.1.3, 00:01:58, Serial0/0
D 192.168.3.0/24 [90/2809856] via 34.1.1.3, 00:01:58, Serial0/0
R4#
5. Post-summary routing
R2 (config) # int s0bin1
R2 (config-if) # ip summary-address eigrp 90 192.168.0.0 255.255.252.0
R2#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
34.0.0.0/24 is subnetted, 1 subnets
D 34.1.1.0 [90/2681856] via 23.1.1.3, 00:44:31, Serial0/1
23.0.0.0/24 is subnetted, 1 subnets
C 23.1.1.0 is directly connected, Serial0/1
C 192.168.0.0/24 is directly connected, Loopback0
C 192.168.1.0/24 is directly connected, Loopback1
C 192.168.2.0/24 is directly connected, Loopback2
C 192.168.3.0/24 is directly connected, Loopback3
D 192.168.0.0/22 is a summary, 00:00:21, Null0
R2#
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 not set
34.0.0.0/24 is subnetted, 1 subnets
C 34.1.1.0 is directly connected, Serial0/0
23.0.0.0/24 is subnetted, 1 subnets
C 23.1.1.0 is directly connected, Serial0/1
D 192.168.0.0/22 [90/2297856] via 23.1.1.2, 00:00:55, Serial0/1
R3#
R4#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
34.0.0.0/24 is subnetted, 1 subnets
C 34.1.1.0 is directly connected, Serial0/0
23.0.0.0/24 is subnetted, 1 subnets
D 23.1.1.0 [90/2681856] via 34.1.1.3, 00:44:29, Serial0/0
D 192.168.0.0/22 [90/2809856] via 34.1.1.3, 00:01:08, Serial0/0
R4#
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