Brocade Virtual ADX Switch and Router Guide (Supporting ADX v03.1.00) - Manual (Page 171)

Brocade Virtual ADX Switch and Router Guide 157
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Enabling OSPFv3
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Syntax: [no] area num | ipv6-addr range ip-addr ip-mask [ advertise | not-advertise] cost
cost-value
The num | ipv6-addr parameter specifies the area number, which can be in IP address format.
The range ipv6-addr parameter specifies the IP address portion of the range. The software
compares the address with the significant bits in the mask. All network addresses that match this
comparison are summarized in a single route advertised by the router.
The ipv6-mask parameter specifies the portions of the IPv6 address that a route must contain to
be summarized in the summary route. In the example above, all networks that begin with 193.45
are summarized into a single route.
The advertise parameter sets the address range status to advertise and generates a Type 3
summary link-state advertisement (LSA). If at least a single route falls under the range, a ranged
LSA will be advertised.
The not-advertise parameter sets the address range status to DoNotAdvertise. Neither the
individual intra-area routes falling under range nor the ranged prefix is advertised as summary LSA.
The cost cost-value parameter specifies the cost-value to be used while generating type-3
summary LSA. If the cost value is configured, then configured cost is used while generating the
summary LSA. If the cost value is not configured, then computed range cost will be used. The
cost-value ranges from 1 to 16777215.
To disable this function, use the no form of this command.
Assigning a totally stubby area
By default, the Brocade device sends summary LSAs (LSA Type 3) into stub areas. You can further
reduce the number of LSAs sent into a stub area by configuring the Brocade device to stop sending
summary LSAs into the area. You can disable the summary LSAs when you are configuring the stub
area or later after you have configured the area.
This feature disables origination of summary LSAs into a stub area, but the Brocade device still
accepts summary LSAs from OSPF neighbors and floods them to other areas. The Brocade device
can form adjacencies with other routers regardless of whether summarization is enabled or
disabled for areas on each router.
When you disable the summary LSAs, the change takes effect immediately. If you apply the option
to a previously configured area, the router flushes all of the summary LSAs it has generated (as an
ABR) from the area.
NOTE
This feature applies only when the Brocade device is configured as an Area Border Router (ABR) for
the area. To completely prevent summary LSAs from being sent to the area, disable the summary
LSAs on each OSPF router that is an ABR for the area.
An example of a totally stub area is as follows:
To disable summary LSAs for stub area 40 and specify an additional metric of 99, enter the
following command:
Virtual ADX(config-ospf6-router)# area 40 stub 99 no-summary
Syntax: area number | ipv4-address stub metric [no-summary]
The number | ipv4-address parameter specifies the area number, which can be a number or in
IPv4 address format. If you specify a number, the number can be from 0 through 2,147,483,647.