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.plNote!
EIGRP adds the router ID to the external prefixes. In case the advertising router receives them back with its own ID, the are being rejected. This serves as the loop prevention mechanism.
Task1
Configure R3 with the router ID = 3.3.3.3. Advertise Loopback0 (172.16.103.0/24) and Loopback1 (172.16.133.0/24) as EIGRP external prefixes.
Task 2
Configure R4 to reject the EIGRP external prefixes advertised by R3. Do not use any filtering commands such as ACLs, route-maps, distribute-list or offset-list.
Lab Solution
Task1
Configure R3 with the router ID = 3.3.3.3. Advertise Loopback0 (172.16.103.0/24) and Loopback1 (172.16.133.0/24) as EIGRP external prefixes.
R3 Configuration:
!
route-map CONN_TO_EIGRP permit 10
match interface Loopback0 Loopback1
match interface Loopback0 Loopback1
!
router eigrp 1
redistribute connected route-map CONN_TO_EIGRP
network 10.1.13.3 0.0.0.0
network 10.1.123.3 0.0.0.0
no auto-summary
redistribute connected route-map CONN_TO_EIGRP
network 10.1.13.3 0.0.0.0
network 10.1.123.3 0.0.0.0
no auto-summary
eigrp router-id 3.3.3.3
!
Verification:
Pic. 4 - R4's Routing Table.
Task 2Configure R4 to reject the EIGRP external prefixes advertised by R3. Do not use any filtering commands such as ACLs, route-maps, distribute-list or offset-list.
Pic. 3 - R3's Router ID Check on R4.
!
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
no auto-summary
eigrp router-id 3.3.3.3
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
eigrp router-id 3.3.3.3
!
Verification:
Pic. 4 - R4's Routing Table.
Notice!R4 rejects EX prefixes this time since it has the SAME EIGRP router ID.
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