CCNA_642-802_ICND4001_Enabling_Static_Routing

1、 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.05-1WAN ConnectionsEnabling Static Routing 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.05-2A router needs to do the following: Know the destination address. Identify the sources from which the router can learn. Discover possible routes

2、 to the intended destination. Select the best route. Maintain and verify routing information.Router Operations 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.05-3 Routers must learn destinations that are not directly connected.Router Operations (Cont.) 2007 Cisco Systems, Inc. All rights rese

3、rved.ICND1 v1.05-4Static RoutesConfigure unidirectional static routes to and from a stub network to allow communications to occur. 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.05-5 Defines a path to an IP destination network or subnet or host Address = IP address of the next hop router Inte

4、rface = outbound interface of the local router RouterX(config)# ip route network mask address | interfacedistance permanent Static Route Configuration 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.05-6Static Route Example This is a unidirectional route. You must have a route configured in th

5、e opposite direction.RouterX(config)# ip route 172.16.1.0 255.255.255.0 172.16.2.1Router(config)#ip route 172.16.1.0 255.255.255.0 s0/0/0 or 2007 Cisco Systems, Inc. All rights reserved.ICND1 v1.05-7Default Routes This route allows the stub network to reach all known networks beyond Router A. 2007 C

6、isco Systems, Inc. All rights reserved.ICND1 v1.05-8Verifying the Static Route ConfigurationRouterX# show ip routeCodes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area E1 - OSPF external type 1, E2 - OSPF external type

7、 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default U - per-user static route Gateway of last resort is 0.0.0.0 to network 0.0.0.0 10.0.0.0/8 is subnetted, 1 subnetsC 10.1.1.0 is directly connected, Serial0/0/0S* 0.0.0.0/0 is directly connected, Serial0 2007 Cisco Sy

8、stems, Inc. All rights reserved.ICND1 v1.05-9Summary Routing is the process by which items get from one location to another. In networking, a router is the device used to route traffic. Routers can forward packets over static routes or dynamic routes, based on the router configuration. Static router

9、s use a route that a network administrator enters into the router manually. Dynamic routers use a route that a network routing protocol adjusts automatically for topology or traffic changes. Unidirectional static routes must be configured to and from a stub network to allow communications to occur. The ip route command can be used to configure default route forwarding. The show ip route command is used to verify that static r