Configuring Filter Lists For Border Routers - Cisco Nexus 3000 Series Configuration Manual

Chapter 3 Configuring 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

Configuring Filter Lists for Border Routers

You can separate your OSPFv2 domain into a series of areas that contain related networks. All areas must
connect to the backbone area through an area border router (ABR). OSPFv2 domains can connect to
external domains as well, through an
on page
ABRs have the following optional configuration parameters:
•
•
ASBRs also support filter lists.
BEFORE YOU BEGIN
Ensure that you have enabled the OSPF feature (see the
page
Create the route map that the filter list uses to filter IP prefixes in incoming or outgoing Network
Summary (type 3) LSAs. See
SUMMARY STEPS
1.
2.
3.
4.
5.
DETAILED STEPS
Command
Step 1
configure terminal
Example:
switch# configure terminal
switch(config)#
Step 2
router ospf instance-tag
Example:
switch(config)# router ospf 201
switch(config-router)#
Step 3
area area-id filter-list route-map
map-name {in | out}
Example:
switch(config-router)# area 0.0.0.10
filter-list route-map FilterLSAs in
3-4.
Area range—Configures route summarization between areas.
Filter list—Filters the Network Summary (type 3) LSAs on an ABR that are allowed in from an
external area.
3-13).
Chapter 11, "Configuring Route Policy Manager."
configure terminal
router ospf instance-tag
area area-id filter-list route-map map-name {in | out}
(Optional) show ip ospf policy statistics
(Optional) copy running-config startup-config
Cisco Nexus 3000 Series NX-OS Unicast Routing Configuration Guide, NX-OS Release 5.0(3)U1(1)
autonomous system border router
"Enabling the OSPFv2 Feature" section on
Purpose
Enters configuration mode.
Creates a new OSPFv2 instance with the configured
instance tag.
Filters incoming or outgoing Network Summary (type
3) LSAs on an ABR.
Configuring Advanced OSPFv2
(ASBR). See the "Areas" section
3-23