Specifications

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Cisco Nexus 3000 Series NX-OS Unicast Routing Configuration Guide, Release 5.0(3)U2(2)
OL-25782-02
Chapter 3 Configuring OSPFv2
Configuring Advanced OSPFv2
Configuring Route Summarization
You can configure route summarization for inter-area routes by configuring an address range that is
summarized. You can also configure route summarization for external, redistributed routes by
configuring a summary address for those routes on an ASBR. See the “Route Summarization” section
on page 3-10.
BEFORE YOU BEGIN
Ensure that you have enabled the OSPF feature (see the “Enabling the OSPFv2 Feature” section on
page 3-13).
SUMMARY STEPS
1. configure terminal
2. router ospf instance-tag
3. area area-id range ip-prefix/length [no-advertise]
4. summary-address ip-prefix/length [no-advertise | tag tag-id]
5. (Optional) show ip ospf summary-address
6. (Optional) copy running-config startup-config
DETAILED STEPS
Command Purpose
Step 1
configure terminal
Example:
switch# configure terminal
switch(config)#
Enters configuration mode.
Step 2
router ospf instance-tag
Example:
switch(config)# router ospf 201
switch(config-router)#
Creates a new OSPFv2 instance with the configured
instance tag.
Step 3
area area-id range ip-prefix/length
[no-advertise]
Example:
switch(config-router)# area 0.0.0.10
range 10.3.0.0/16
Creates a summary address on an ABR for a range of
addresses and optionally does note advertise this
summary address in a Network Summary (type 3)
LSA.
Step 4
summary-address ip-prefix/length
[no-advertise | tag tag]
Example:
switch(config-router)# summary-address
10.5.0.0/16 tag 2
Creates a summary address on an ASBR for a range of
addresses and optionally assigns a tag for this
summary address that can be used for redistribution
with route maps.