EIGRP Stub Connected Summary
Oke Guys, Now i will explain to you one material of EIGRP, there is EIGRP Stub. Before this let's we acquinted with EIGRP Stub. EIGRP stub is a way or system used to do a filter some network that not listed in routing table. EIGRP stub Eigrp stub used when we want to do to certain filter network, because we consider network was not too important if listed on the table we routing. but filtering in here have a meaning to abbreviate the routing table for save the router resource. For the clarify directly let goes to topology and configuration.
Topology:
Lab scenario:
I will make the stub on R3, That R1 network loopback interface aren't listed in R3 routing table.
Configuration:
R1 Configuration:
R1(config)#int fa0/0R2 Configuration:
R1(config-if)#no sh
R1(config-if)#ip add 12.12.12.1 255.255.255.0
R1(config-if)#int lo0
R1(config-if)#ip add 1.1.1.1 255.255.255.255
R1(config-if)#int lo1
R1(config-if)#ip add 1.1.1.2 255.255.255.255
R1(config-if)#int lo2
R1(config-if)#ip add 1.1.1.3 255.255.255.255
R1(config-if)#int lo3
R1(config-if)#ip add 1.1.1.4 255.255.255.255
R1(config-if)#exit
R1(config)#router rip
R1(config-router)#ver 2
R1(config-router)#no auto
R1(config-router)#net 12.12.12.0
R1(config-router)#net 1.1.1.0
R2(config)#int fa0/0R3 Configuration:
R2(config-if)#no sh
R2(config-if)#ip add 12.12.12.2 255.255.255.0
R2(config-if)#int fa0/1
R2(config-if)#no sh
R2(config-if)#ip add 23.23.23.2 255.255.255.0
R2(config-if)#int lo0
R2(config-if)#ip add 2.2.2.2 255.255.255.255
R2(config-if)#router rip
R2(config-router)#ver 2
R2(config-router)#no auto
R2(config-router)#net 12.12.12.0
R2(config-router)#router eigrp 18
R2(config-router)#no aut
R2(config-router)#net 23.23.23.2 0.0.0.0
R2(config-router)#net 2.2.2.2 0.0.0.0
R2(config-router)#redistribute static
R2(config-router)#redistribute rip met 1 1 1 1 1
R2(config-router)#exit
R2(config)#int fa0/1
R2(config-if)#ip summary-address eigrp 18 1.1.1.0 255.255.255.248
R3(config)#int fa0/0After that let we see the routing table on R3
R3(config-if)#no sh
R3(config-if)#ip add 23.23.23.3 255.255.255.0
R3(config-if)#int lo0
R3(config-if)#ip add 3.3.3.3 255.255.255.255
R3(config-if)#router eig 18
R3(config-router)#no aut
R3(config-router)#net 23.23.23.3 0.0.0.0
R3(config-router)#net 3.3.3.3
R3(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
1.0.0.0/29 is subnetted, 1 subnets
D 1.1.1.0 [90/2560025856] via 23.23.23.2, 01:08:21, FastEthernet0/0
2.0.0.0/32 is subnetted, 1 subnets
D 2.2.2.2 [90/409600] via 23.23.23.2, 01:14:21, FastEthernet0/0
3.0.0.0/32 is subnetted, 1 subnets
C 3.3.3.3 is directly connected, Loopback0
23.0.0.0/24 is subnetted, 1 subnets
C 23.23.23.0 is directly connected, FastEthernet0/0
12.0.0.0/24 is subnetted, 1 subnets
D EX 12.12.12.0 [170/2560025856] via 23.23.23.2, 01:14:22, FastEthernet0/0
In R3 routing table we can see had consist with any routing protocol, like a summary, static, and redistribute. Now we'll try the default stub on R2. Stub in default use the twice features that's connected and summary.
R2 Configuration:
R2(config)#router eigrp 18Why we configure stub on R2, not on R3. coz.. R2 as a routing table distributor between R1 and R3. And R3 just a receiver routing table to. If we configure the EIGRP stub on R3, so EIGRP stub isn't run.
R2(config-router)#eigrp stub
After that let's check the routing table on R3.
R3(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
1.0.0.0/29 is subnetted, 1 subnets
D 1.1.1.0 [90/2560025856] via 23.23.23.2, 00:06:10, FastEthernet0/0
2.0.0.0/32 is subnetted, 1 subnets
D 2.2.2.2 [90/409600] via 23.23.23.2, 00:06:10, FastEthernet0/0
3.0.0.0/32 is subnetted, 1 subnets
C 3.3.3.3 is directly connected, Loopback0
23.0.0.0/24 is subnetted, 1 subnets
C 23.23.23.0 is directly connected, FastEthernet0/0
Based on routing table above, we can see the routing table just consist by network with flags or mark C a.k.a connected and D a.k.a flags of EIGRP with prefix had been summary and D a.k.a flags of EIGRP with R2 loopback interface.
And EIGRP stub configuration can be custome, example: we want to configure that network with flags or mark D EX a.k.a flags of External EIGRP. This flags mean this network had been reached from different routing protocol. So we can use EIGRP stub redistribute.
Now we want to filter just network with prefix has been summary are list on R3 routing table.
First remove the EIGRP stub Which has on configuration before.
R2(config)#router eigrp 18Now let we configure EIGRP stub summary.
R2(config-router)#no eigrp stub
R2(config)#router eigrp 18After that, now we can verify on R3 routing table.
R2(config-router)#eigrp stub summary
R3(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
1.0.0.0/29 is subnetted, 1 subnets
D 1.1.1.0 [90/2560025856] via 23.23.23.2, 00:01:49, FastEthernet0/0
3.0.0.0/32 is subnetted, 1 subnets
C 3.3.3.3 is directly connected, Loopback0
23.0.0.0/24 is subnetted, 1 subnets
C 23.23.23.0 is directly connected, FastEthernet0/0
Based on routing table above, we can see the routing table just consist just by network with flags or mark C a.k.a connected and D with prefix had been summary.
Allright, so EIGRP stub we had configure is SUCCESS!!!...
I think this enough for this post....
And I apologize if my grammar and my english vocabularies is too bad..
Thank you, and see you on next post......
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