HP 3500YL User Manual
Page 251
IP Routing Features
Configuring OSPF
Syntax: area < ospf-area-id > range < ip-addr/mask-length > [no-advertise]
[ type < summary | nssa >]
Use this command on a routing switch intended to operate as
an ABR for the specified area to do either of the following:
■
Simultaneously create the area and corresponding range
setting for routes to summarize or block.
■
For an existing area, specify a range setting for routes to
summarize or block.
< ospf-area-id >: Same area ID as on page 5-66 except you cannot
use a backbone area number (
0 or 0.0.0.0) for a stub area or
NSSA.
range < ip-addr/mask-length >: Defines the range of route
advertisements to either summarize for injection into the
backbone area or to prevent from being injected into the
backbone area.
The
ip-addr value specifies the IP address portion of the range,
and
mask-length specifies the leftmost significant bits in the
address. The ABR for the specified area compares the IP
address of each outbound route advertisement with the address
and significant bits in the mask to determine which routes to
select for either summarizing or blocking. For example, a
range of 10.10.32.1/14 specifies all routes in the range of
10.10.32.1 - 10.10.35.254.
[no-advertise]: Use this keyword only if you want to configure
the ABR to prevent advertisement to the backbone of a specified
range of routes. (This has the effect of “hiding” the specified
range from the backbone area.) If you do not use this option,
the ABR advertises the specified range of routes according to
the
type < summary | nssa > selection described below.
[ type < summary | nssa >]: Configures the type of route
summaries to advertise or block. If
type is not used in the
command, then the ABR defaults this setting to
summary.
summary: Specifies internal routes in the configured range
of route advertisements. If
no-advertise (above) is used in
the command, then the ABR prevents the selected internal
routes from being summarized in a type-3 LSA and
advertised to the backbone. If
no-advertise is not used in
the command, then the selected routes are summarized to
the backbone in a type-3 LSA.
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