Brocade Network OS Command Reference v4.1.0 - Manual (Page 78)

40 Network OS Command Reference
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area range (OSPF)
2
area range (OSPF)
Specifies area range parameters on an Area Border Router (ABR).
Synopsis area {A.B.C.D | decimal} range E.F.G.H I.J.K.L {advertise | cost cost_value | not-advertise}
no area range
Operands A.B.C.D Area address in dotted decimal format.
decimal Area address in decimal format.
E.F.G.H I.J.K.L Specifies the IP address and mask portion of the range. All network
addresses that match this network are summarized in a single route and
advertised by the ABR.
advertise Sets the address range status to advertise and generates a Type 3
summary LSA.
cost cost_value Sets the cost value for the area range. This value is used as the generated
summary LSA cost. The range for cost_value is 1 to 6777214.
If this value is not specified, the cost value is the default range metric
calculation for the generated summary LSA cost.
not-advertise Sets the address range status to DoNotAdvertise; the Type 3 LSA is
suppressed, and the component networks remain hidden from other
networks. This setting is used to temporarily pause route summarization
from the area.
Defaults None
Command Modes OSPF VRF router configuration mode
Description Use this command only on ABRs to specify route summarization for an existing area. The result is
that a single summary route is advertised to other areas by the ABR, in the form of a Type 3 LSA.
Routing information is condensed at area boundaries and external to the area, and only a single
route is advertised for each address range.
An example of when you might want to use this command is if you have many small networks
advertised from area 0 to any other area, or from any non-backbone area into the backbone. This
command gives you a summary route instead of many smaller routes. In an area, the OSPF
database on each router must be an exact copy of the databases of the other routers. This means
that no summarization is allowed within the area.
Usage Guidelines Enter no area range to disable the specification of range parameters on an ABR.
Examples To advertise to Area 3 all the addresses on the network 1.1.1.0 255.255.255.0 in the ABR you are
signed into:
switch# configure
switch(config)# rbridge-id 5
switch(config-rbridge-id-5)#router ospf
switch(config-router-ospf-vrf-default-vrf)# area 3 range 1.1.1.0 255.255.255.0
advertise
See Also None