Di Posting Oleh : Simple Learning
Kategori : Core Technologies EIGRP Routing
Prerequisites: CCNP level skills.
Topology
Pic. 1 - Topology Diagram.
Icons designed by: Andrzej Szoblik - http://www.newo.plTask1
Make R4 the gateway of the last resort for all routers. Use the following methods (always remove the previous one before proceeding to the new one):
- Using summary route.
- Using 'network 0.0.0.0'.
- Using the default route redistribution.
- Using 'ip default-network' statement.
Task 1
Make R4 the gateway of the last resort for all routers. Use the following methods (always remove the previous one before proceeding to the new one):
Method 1 - Summary Route
R4 Configuration:
!
interface FastEthernet1/0
ip address 10.1.124.4 255.255.255.0
ip summary-address eigrp 1 0.0.0.0 0.0.0.0 5
ip address 10.1.124.4 255.255.255.0
ip summary-address eigrp 1 0.0.0.0 0.0.0.0 5
!
Method 2 - Network 0.0.0.0
R4 Configuration:
!
ip route 0.0.0.0 0.0.0.0 null0
!
router eigrp 1
network 10.1.124.4 0.0.0.0
network 172.16.104.4 0.0.0.0
network 172.16.144.4 0.0.0.0
network 0.0.0.0
no auto-summary
network 10.1.124.4 0.0.0.0
network 172.16.104.4 0.0.0.0
network 172.16.144.4 0.0.0.0
network 0.0.0.0
no auto-summary
!
Method 3 - Default Route Redistribution
R4 Configuration:
!
ip route 0.0.0.0 0.0.0.0 Null0
!
router eigrp 1
redistribute static
network 10.1.124.4 0.0.0.0
network 172.16.104.4 0.0.0.0
network 172.16.144.4 0.0.0.0
no auto-summary
redistribute static
network 10.1.124.4 0.0.0.0
network 172.16.104.4 0.0.0.0
network 172.16.144.4 0.0.0.0
no auto-summary
!
Method 4 - IP Default-Network
Note!
This method comes from IGRP. It assumes that the router will use the default network rather than default route (0.0.0.0). The method has two stipulations:
- the network advertised as the gateway of last resort must belong to a class A, B, or C network
- the network advertised as the gateway of last resort must not be directly connected to the advertising router (must be learned)
In order to overcome these stipulations the following will work:
R4 Configuration:
!
ip default-network 172.16.104.0
!
Verification:
This step results in creating the following entry:
Pic. 2 - R4's Routing Table.
Since the classful entry now appears in the routing table, the following configuration will create default network on R4. (the network of the last resort).
R4 Configuration:
!
ip default-network 172.16.0.0
!
The above command replaces the previous one and results with:
Pic. 3 - R4's Routing Table.
The last step is to redistribute this static entry into EIGRP in order to advertise the gateway of the last resort to R4's EIGRP neighbors.
R4 Configuration:
!
router eigrp 1
redistribute static
network 10.1.124.4 0.0.0.0
network 172.16.104.4 0.0.0.0
network 172.16.144.4 0.0.0.0
no auto-summary
redistribute static
network 10.1.124.4 0.0.0.0
network 172.16.104.4 0.0.0.0
network 172.16.144.4 0.0.0.0
no auto-summary
!
This results in advertising default network (*)
Pic. 4 - R1's Routing Table.
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