Setting The Router Id - HP 7102dl - ProCurve Secure Router Configuration Manual

IP Routing—Configuring RIP, OSPF, BGP, and PBR
Configuring OSPF
N o t e
15-44
In addition, for ABRs you can:
prohibit a summary LSA from being advertised
You complete most OSPF configurations from the OSPF configuration mode
context. However, you alter OSPF intervals for individual interfaces from that
interface's configuration mode context. Because different networks can use
different passwords, you also configure authentication for individual inter-
faces from their logical configuration mode context.
After OSPF is enabled on an interface, the router immediately begins com-
municating with its neighbors. If you continue to configure OSPF, your
configurations may not take effect or may disrupt the active network. For
example, after the router takes an ID, it keeps that ID even if you later
configure a loopback interface with a higher IP address. You should always
completely configure OSPF and other routing protocols before physically
connecting the router to the network.
Enter the following command to access the OSPF configuration mode
context:
ProCurve(config)# router ospf

Setting the Router ID

The LSA for each link consists of a link ID and a metric. For a link to another
router, the link ID is the router ID of the router at the other end of the
connection.
Routers must be able to piece LSAs together into a coherent network topology.
They can only complete this task if the router ID advertised for each link is
unique, consistent, and significant for the entire network. A router might have
several different interfaces, each with its own IP address. OSPF must select a
single address to consistently identify the router.
By default, a ProCurve Secure Router takes its router ID from the highest IP
address configured on a loopback interface or, if no loopback interface is
configured, from the active interface with the highest IP address. For example,
if a router had two loopback interfaces, one with the IP address 10.1.1.1 /24
and one with the IP address 192.168.1.1 /24, its router ID would be 192.168.1.1.
You should configure a loopback interface to identify the router. This is
particularly important because WAN routers may connect LANs with diverse
addressing schemes. If you simply allow OSPF to identify each of these routers
by highest IP address, network administrators at one site may find it difficult