Virtual Link; Configure Ospf Interface Parameters - Cisco 2610XM Configuration

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

2.2.4 Configure OSPF Interface Parameters

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.
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