Cisco 2600 Series Configuration - Page 11

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If no OSPF router ID is explicitly configured, OSPF computes the router-ID based on

the items 2, 3, and 4 and restarts OSPF (if the process is enabled and router-ID has

changed). The ospf router-id command causes the OSPF process to restart using the

new router-ID (if the processes are enabled and router-ID has changed).

Use in router configuration mode ospf router-id ip-address command to set the OSPF

router ID for the system. Use the no ospf router-id to configure the OSPF router ID as

the default value (address of the loopback 0 interface). Factory Default is Loopback 0

interface address.

Router(config-router)#router id 1.1.1.1

It is very recommend checking router's router ID by giving the next command

Router#show ip ospf

2.2.3 Virtual Link

A Virtual link can be built up for network shown in Figure (2) by

1. Defining Router IDs for the both ends.

2. Giving in router configuration mode the area x virtual-link A.B.C.D, where x is

area ID in the both routers. For example in Router 1.1.1.1

Router(config-router)#area 1 virtual-link 2.2.2.2

To ensure a virtual link is up, give the next command

Router#show ip ospf

You are not required to alter any of these parameters, but some interface parameters

must be consistent across all routers in an attached network. In interface configuration

mode, specify any of the following commands show in Table (4).

Table 4. OSPF Interface Parameters.

Command

ip ospf cost cost

ip ospf retransmit-interval seconds

Figure 2. Configuration a Virtual link.

Purpose

Explicitly specify the cost of sending a

packet on an OSPF interface.

Specify the number of seconds between

link state advertisement retransmissions

for adjacencies belonging to an OSPF

interface.