Configuring Nssa - Cisco Nexus 3000 Series Configuration Manual

Configuring Advanced OSPFv2
S e n d d o c u m e n t c o m m e n t s t o n e x u s 3 k - d o c f e e d b a c k @ c i s c o . c o m
Command
area area-id stub no-summary
Example:
switch(config-router)# area 20 stub
no-summary

Configuring NSSA

You can configure an NSSA for part of an OSPFv2 domain where limited external traffic is required. See
the "Not-So-Stubby Area" section on page
External (type 5) LSA and flood the OSPFv2 domain with this routing information. An NSSA can be
configured with the following optional parameters:
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BEFORE YOU BEGIN
Ensure that you have enabled the OSPF feature (see the
page
Ensure that there are no virtual links in the proposed NSSA and that it is not the backbone area.
SUMMARY STEPS
1.
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3.
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6.
Cisco Nexus 3000 Series NX-OS Unicast Routing Configuration Guide, NX-OS Release 5.0(3)U1(1)
3-26
No redistribution—Redistributed routes bypass the NSSA and are redistributed to other areas in the
OSPFv2 autonomous system. Use this option when the NSSA ASBR is also an ABR.
Default information originate—Generates an NSSA External (type 7) LSA for a default route to the
external autonomous system. Use this option on an NSSA ASBR if the ASBR contains the default
route in the routing table. This option can be used on an NSSA ABR whether or not the ABR
contains the default route in the routing table.
Route map—Filters the external routes so that only those routes that you want are flooded
throughout the NSSA and other areas.
Translate—Translates NSSA External LSAs to AS External LSAs for areas outside the NSSA. Use
this command on an NSSA ABR to flood the redistributed routes throughout the OSPFv2
autonomous system. You can optionally suppress the forwarding address in these AS External LSAs.
If you choose this option, the forwarding address is set to 0.0.0.0.
No summary—Blocks all summary routes from flooding the NSSA. Use this option on the NSSA
ABR.
3-13).
configure terminal
router ospf instance-tag
area area-id nssa [no-redistribution] [default-information-originate [route-map map-name]]
[no-summary] [translate type7 {always | never} [suppress-fa]]
(Optional) area area-id default-cost cost
(Optional) show ip ospf instance-tag
(Optional) copy running-config startup-config
Purpose
Creates this area as a totally stubby area.
3-9. You can optionally translate this external traffic to an AS
"Enabling the OSPFv2 Feature" section on
Chapter 3 Configuring OSPFv2