User's Manual

Table Of Contents
545
Users Manual of CS-6306R
Command Purpose
areaarea-idrange ipv6-prefix
/prefix-length
Sets the address' range of the
summary route.
54.3.7 Setting the Summary of the Forwarded Routes
When routes are distributed from other routing areas to the OSPFv3 routing area, each route is singularly
broadcasted as an external LSA. However, you can set a route on a router to make this route cover an
address range. In this way, the size of the OSPFv3 link-state database can be reduced.
Run the following command in router configuration mode to set a summary route:
Command Purpose
summary-prefixipv6-prefix
/prefix-length
Broadcasts only one summary route.
54.3.8 Generating a Default Route
ASBR should generate a default route to enter the OSPFv3 routing area. Whenever it is, you make
configuration to enable a router to distribute a route to the OSPFv3 routing area and this route becomes
ASBR automatically. However, ASBR does not generate a default route by default to enter the OSPFv3
routing area.
54.3.9 Choosing the Route ID on the Loopback Interface
OSPFv3 uses the maximum IPv4 address as its router ID. If the interface that connects the IPv4 address is
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 addressip-address mask
Distributes an IPv4 address for an interface.