ECS4660-28F_Management Guide-R03

C HAPTER 51 | IP Routing Commands
Open Shortest Path First (OSPFv3)
– 1798 –
area range This command summarizes the routes advertised by an Area Border Router
(ABR). Use the no form to disable this function.
SYNTAX
[no] area area-id range ipv6-prefix/prefix-length {advertise |
not-advertise}
area-id - Identifies an area for which the routes are summarized.
The area ID can be in the form of an IPv4 address or as a four octet
unsigned integer ranging from 0-4294967295.
ipv6-prefix - A full IPv6 address including the network prefix and
host address bits.
prefix-length - A decimal value indicating how many contiguous bits
(from the left) of the address comprise the prefix (i.e., the portion
of the address to summarize).
advertise - Advertises the specified address range.
not-advertise - The summary is not sent, and the routes remain
hidden from the rest of the network.
COMMAND MODE
Router Configuration
DEFAULT SETTING
Disabled
COMMAND USAGE
◆ This command can be used to summarize intra-area routes and
advertise this information to other areas through Area Border Routers
(ABRs).
◆ If the network addresses within an area are assigned in a contiguous
manner, the ABRs can advertise a summary route that covers all of the
individual networks within the area that fall into the specified range
using a single area range command.
◆ If routes are set to be advertised by this command, the router will issue
a Type 3 summary LSA for each address range specified by this
command.
◆ This router supports up 64 summary routes for area ranges.
EXAMPLE
This example creates a summary address for all area routes in the range of
73::/8, or all IPv6 address that start with the first byte 73 (hexadecimal).
Console(config-router)#area 1 range 73::/8 advertise
Console(config-router)#