EIGRP STUB STATIC

KEY POINTS:

A EIGRP STUB STATIC router have the following behaviors:

> It can received a network advertise by the Neighboring EIGRP Router.

> The STUB Router can select which routes to advertise or share to the neighboring router by configuring the static routes.

> Redistribution is a must on the STUB Router. This can be completed by applying “redistribute static” under the EIGRP Process.

EIGRP CONFIGURATIONS OF THE THREE ROUTERS:

MANILA#sh run | sec eigrp
router eigrp 12
network 100.100.100.0 0.0.0.255
network 192.168.12.0

MELBOURNE#sh run | sec eigrp
router eigrp 12
network 192.168.12.0
network 200.200.200.0

SINGAPORE#sh run | sec eigrp
router eigrp 12
network 150.150.150.0 0.0.0.255
network 192.168.23.0

SINGAPORE#

NOTE: If you notice the above configurations, although, I have configured “no auto-summary” under EIGRP process, it does not show for the results of the show run | sec eigrp.

Now before we configured the EIGRP STUB STATIC, Let’s see what’s the current entries of the routing table on the three routers.

MANILA#show ip route eigrp
Codes: L – local, 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, H – NHRP, l – LISP
       + – replicated route, % – next hop override

Gateway of last resort is not set

      150.150.0.0/24 is subnetted, 1 subnets
D        150.150.150.0 [90/2809856] via 192.168.12.2, 00:00:10, Serial2/0
D     192.168.23.0/24 [90/2681856] via 192.168.12.2, 00:00:10, Serial2/0
D     200.200.200.0/24 [90/2297856] via 192.168.12.2, 00:06:23, Serial2/0

MELBOURNE#show ip route eigrp
Codes: L – local, 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, H – NHRP, l – LISP
       + – replicated route, % – next hop override

Gateway of last resort is not set

      100.0.0.0/24 is subnetted, 1 subnets
D        100.100.100.0 [90/2297856] via 192.168.12.1, 00:00:02, Serial2/0
      150.150.0.0/24 is subnetted, 1 subnets
D        150.150.150.0 [90/2297856] via 192.168.23.3, 00:02:23, Serial2/1

SINGAPORE#show ip route eigrp
Codes: L – local, 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, H – NHRP, l – LISP
       + – replicated route, % – next hop override

Gateway of last resort is not set

      100.0.0.0/24 is subnetted, 1 subnets
D        100.100.100.0 [90/2809856] via 192.168.23.2, 00:00:36, Serial2/1
D     192.168.12.0/24 [90/2681856] via 192.168.23.2, 00:03:04, Serial2/1
D     200.200.200.0/24 [90/2297856] via 192.168.23.2, 00:03:04, Serial2/1

>>> As observed, all the three routers have the CORRECT Routing entries without the EIGRP STUB Configurations.

Now, let’s enabled EIGRP STUB STATIC on MELBOURNE Router.

MELBOURNE#config t
Enter configuration commands, one per line. End with CNTL/Z.
MELBOURNE(config)#router eigrp 12
MELBOURNE(config-router)#eigrp stub static

Let’s check the routing entries of the three routers,

MELBOURNE#show ip route eigrp
Codes: L – local, 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, H – NHRP, l – LISP
       + – replicated route, % – next hop override

Gateway of last resort is not set

      100.0.0.0/24 is subnetted, 1 subnets
D        100.100.100.0 [90/2297856] via 192.168.12.1, 00:00:13, Serial2/0
      150.150.0.0/24 is subnetted, 1 subnets
D        150.150.150.0 [90/2297856] via 192.168.23.3, 00:00:13, Serial2/1

>>> As expected, still have the entries of both the MANILA and SINGAPORE Loopback address.

MANILA#show ip route eigrp
Codes: L – local, 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, H – NHRP, l – LISP
       + – replicated route, % – next hop override

Gateway of last resort is not set

MANILA#

SINGAPORE#sh ip route eigrp
Codes: L – local, 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, H – NHRP, l – LISP
       + – replicated route, % – next hop override

Gateway of last resort is not set

SINGAPORE#

>>> As observed from both the MANILA and SINGAPORE routers, it inherits the behavior of the EIGRP STUB RECEIVE-ONLY.

NOT UNTIL WE SET A STATIC Routes, the Loopback address for both MANILA and SINGAPORE routers will not be installed on their routing table.

So I will be configuring ‘STATIC ROUTE” on MELBOURNE ROUTER.

MELBOURNE(config)#ip route 100.100.100.0 255.255.255.0 192.168.12.1
MELBOURNE(config)#

>> Static route to the Loopback address of MANILA ROUTER.

MELBOURNE(config)#ip route 150.150.150.0 255.255.255.0 192.168.23.3
MELBOURNE(config)#

>>Static route to the Loopback address of SINGAPORE Router.

BUT I need to redistribute the Static Routes into EIGRP PROCESS otherwise it will not be installed on MANILA & SINGAPORE Routing Table.

MELBOURNE(config)#router eigrp 12
MELBOURNE(config-router)#redistribute static
MELBOURNE(config-router)#

NOW, LET’S CHECK THE ROUTING entries on both the MANILA and SINGAPORE ROUTERS.

MANILA#show ip route eigrp
Codes: L – local, 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, H – NHRP, l – LISP
       + – replicated route, % – next hop override

Gateway of last resort is not set

150.150.0.0/24 is subnetted, 1 subnets
D EX 150.150.150.0 [170/2681856] via 192.168.12.2, 00:00:50, Serial2/0
MANILA#

Gateway of last resort is not set

100.0.0.0/24 is subnetted, 1 subnets
D EX 100.100.100.0 [170/2681856] via 192.168.23.2, 00:00:59, Serial2/1
SINGAPORE#

>> As observed, we can see that MANILA and SINGAPORE Router have learned the static routes as an ” External EIGRP Network”.

NETWORK LESSON