VPRN Service Configuration Commands
Page 1082 7750 SR OS Services Guide
ABRs send summary link advertisements to describe routes to other areas. To minimize the number of
advertisements that are flooded, you can summarize a range of IP addresses and send reachability
information about these addresses in an LSA.
The no form of the command deletes the range (non) advertisement.
Default no area-range — No range of addresses are defined.
Special Cases NSSA Context — In the NSSA context, the option specifies that the range applies to external
routes (via type-7 LSAs) learned within the NSSA when the routes are advertised to other areas as
type-5 LSAs.
Area Context — If this command is not entered under the NSSA context, the range applies to
summary LSAs even if the area is an NSSA.
Parameters ip-prefix — The IP prefix in dotted decimal notation for the range used by the ABR to advertise that
summarizes the area into another area.
Values 0.0.0.0 - 255.255.255.255
mask — The subnet mask for the range expressed as a decimal integer mask length or in dotted
decimal notation.
Values 0 — 32 (mask length), 0.0.0.0 — 255.255.255.255 (dotted decimal)
advertise | not-advertise — Specifies whether or not to advertise the summarized range of addresses
into other areas. The advertise keyword indicates the range will be advertised, and the keyword
not-advertise indicates the range will not be advertised.
The default is advertise.
blackhole-aggregate
Syntax [no] blackhole-aggregate
Context config>service>vprn>ospf>area
Description This command installs a low priority blackhole route for the entire aggregate. Exisiting routes that
make up the aggregate will have a higher priority and only the components of the range for which no
route exists are blackholed.
It is possible that when performing area aggregation, addresses may be included in the range for
which no actual route exists. This can cause routing loops. To avoid this problem configure the
blackhole aggregate option.
Use the no form of this command to remove this option.
Default blackhole-aggregate
interface
Syntax [no] interface ip-int-name
Context config>service>vprn>ospf>area
To Next Page
Loading...
