User's Manual

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down or the IPv4 address is deleted, the OSPF process will recalculate the ID of this new router and retransmit
the routing information from all interfaces.
If an IPv4 address is configured on a loopback interface, the router will first use the IPv4 address of loopback
as its ID. Because the loopback interface will never be down, the routing table is greatly stable.
The router can first select the loopback interface as its ID or select the maximum IPv4 address in all loopback
interfaces as its ID. If there is no loopback interface, the IPv4 address of a router will be used as the router ID.
You cannot specify OSPFv3 to use any specific interface.
Run the following commands in global configuration mode to set the IP loopback interface:
Command Purpose
interface loopback num
Creates a loopback interface and enters the
interface configuration mode.
ip address
ip-address mask Distributes an IPv4 address for an interface.
80.3.10 Setting the Management Distance of OSPFv3
The management distance means the trust level of the routing information source. Generally speaking, the
management distance is an integer between 0 and 255. The bigger its value is, the lower the trust level is. If
the management distance is 255, the routing information source will be distrusted and omitted.
OSPFv3 uses three different kinds of management distances: inter-domain, inner-domain and exterior. The
routes in a domain are called inner-domain routes; the routes to other domains are called inter-domain routes;
the routes transmitted from other routing protocols are called the exterior routes. The default value of each
kind of routes is 110.
80.3.11 Setting the Timer of Routing Algorithm
You can set the delay between receiving the topology change information and calculating SPF. You can also
set the interval between two continuous SFP algorithm. Run the following command in router configuration
mode:
Command Purpose
timers delay
delaytime Set a delay for routing algorithm in an area.
timers hold
holdtime Sets a minimum interval for routing algorithm in
an area.
80.3.12 Monitoring and Maintaining OSPFv3
The network statistics information which can be displayed includes the content of the IP routing table, caching
and database. This kind of information can help users to judge the usage of network resources and solve
network problems.
You can run the following commands to display all kinds of routing statistics information:
Command Purpose
show ipv6 ospf
[process-id] Displays the general information about the
OSPFv3 routing process.