Configure OSPFv2 on an Advanced Routing Engine

Configure a Logical Router.
Enable OSPFv2 and configure general settings.
Select
Network
Routing
Logical Routers
and select a logical router.
Select
OSPF
and
Enable
it.
Enter the
Router ID
in the format of an IPv4 address.
If you want to apply BFD to OSPF, select a
BFD Profile
you created, or select the
default
profile, or create a new BFD Profile. Default is
None (Disable BFD)
.
Select an OSPF
Global General Timer
profile or create a new one.
Select an OSPF
Global Interface Timer
profile or create a new one.
Select an OSPF
Redistribution Profile
or create a new one to redistribute IPv4 static routes, connected routes, RIPv2 routes, IPv4 BGP routes, or the IPv4 default route to OSPF.
Create an OSPF area and specify characteristics based on the type of area.
Select
Area
and
Add
an area identified by its
Area ID
in x.x.x.x format. This is the identifier that each neighbor must accept to be part of the same area.
Select the
Type
tab and for
Authentication
, select an Authentication profile or create a new Authentication profile.
Select the
Type
of area:
Normal
—There are no restrictions; the area can carry all types of routes (intra-area routes, inter-area routes, and external routes).
Stub
—There is no outlet from the area. To reach a destination outside of the area, traffic must go through an Area Border Router (ABR), which connects to other areas.
NSSA
(Not-So-Stubby-Area)—NSSAs implement stub or totally stubby functionality, yet contain an autonomous system boundary router (ASBR). Type 7 LSAs generated by the ASBR are converted to Type 5 by ABRs and flooded to the rest of the OSPF domain. (The next graphic shows NSSA selected.)
(
Stub and NSSA areas only
) Select
no-summary
to prevent the area from receiving Type 3 Summary LSAs and thereby reduce traffic in the area.
(
NSSA area only
) Select
Default information originate
to cause OSPF to originate a default route.
Enter a
Metric
for the default route; range is 1 to 16,777,214; default is 10.
Select the
Metric-Type
:
Type 1
or
Type 2
. Type E1 cost is the sum of the external cost plus the internal cost to reach that route. Type E2 is only the external cost of that route. This can be useful when you want to load-balance the same external route, for example.
Select
ABR
to filter prefixes going in or out of the area, and then configure the following filters:
Select an
Import-list
or create a new Access List to filter network routes coming from another router into the area in LSAs, based on IPv4 source address, thus allowing or preventing the routes from being added to the global RIB (leave the destination address of the access list empty).
Select an
Export-list
or create a new Access List to filter network routes that originated in the area, to allow or prevent the routes from being advertised to other areas.
Select an
Inbound Filter List
or create a new Prefix List to filter network prefixes coming into the area.
Select an
Outbound Filter List
or create a new Prefix List to filter network prefixes that originated in the area, to prevent the routes from being advertised to other areas.
If the
Type
of area is
NSSA
and
ABR
is selected,
Add
an
IPv4 Prefix
to summarize a group of external subnets into a single Type-7 LSA, which is then translated to a Type-5 LSA and advertised to the backbone when you select
Advertise
.
Specify the network range for the area.
Select

Range

and

Add

an

IP Address/Netmask

, which summarizes routes for the area. The result is that a Type-3 Summary LSA with routing information matching this range is advertised into the backbone area if that area contains at least one intra-area network (that is, described with router or network LSA) from this range.

Look at the learned routes in the LSDB for the area and use this Range to summarize routes, thereby reducing LSA traffic.

Enter a

Substitute

IP address/netmask so that a Type-3 Summary LSA with this IP address/netmask is announced into the backbone area if the area contains at least one intra-area network from the

IP Address/Netmask

specified in the prior step.

Use the Substitute IP address/netmask as a way to translate a private address to a public address. A Substitute address has no effect if Advertise is disabled.

Select

Advertise

to send link-state advertisements (LSAs) that match the subnet; default is enabled.
Configure each interface to be included in the area.
Add
an
Interface
by selecting one and
Enable
it.
Select
MTU Ignore
to ignore maximum transmission unit (MTU) mismatches when trying to establish an adjacency (default is disabled; MTU match checking occurs). RFC 2328 defines the interface MTU as “The size in bytes of the largest IP datagram that can be sent out the associated interface, without fragmentation.”
Select
Passive
to allow the network of the interface to be advertised, but no neighbor relationship is established on that interface; this is useful for leaf interfaces.
Select the
Link Type
:
Broadcast
—All neighbors that are accessible through the interface are discovered automatically by multicasting OSPF Hello messages, such as over an Ethernet interface.
p2p
(point-to-point)—Automatically discover the neighbor.
p2mp
(point-to-multipoint)—Neighbors must be defined manually:
Add
the
Neighbor
IP address for all neighbors that are reachable through this interface and the
Priority
of each neighbor to be elected the designated router (DR) or backup DR; range is 0 to 255; default is 1.
Enter the OSPF
Priority
for the interface to be elected as a designated router (DR) or backup DR (BDR); range is 0 to 255; default is 1. If zero is configured, the router will not be elected as DR or BDR.
Select a
Timer Profile
to apply to the interface or create a new OSPF Interface Timer profile. This OSPF Interface Timer profile overrides the Global Interface Timer applied to OSPF.
Select an
Authentication Profile
to apply to the interface or create a new OSPF Interface Authentication profile. This Authentication Profile overrides the Authentication Profile applied to the Area (on the Type tab).
By default, the interface will inherit the BFD profile you applied to the logical router for OSPF (
Inherit-lr-global-setting
). Alternatively, select the
default
profile, select a different
BFD Profile
, create a new BFD Profile, or select
None (Disable BFD)
to disable BFD for the interface.
Enter an OSPF
Cost
for the interface, which influences route selection; range is 1 to 65,5535; default is 10. During route selection, a route with a lower cumulative cost (the added costs of each interface used) is preferred over a route with a higher cumulative cost.
Click
OK
.
If the ABR does not have a physical link to the backbone area, configure a virtual link to a neighbor ABR within the same area that has a physical link to the backbone area.
Select
Virtual Link
.
Add
a virtual link by
Name
.
Enable
the virtual link.
Select the transit
Area
where the neighbor ABR that has the physical link to the backbone area is located.
Enter the
Router ID
of the neighbor ABR on the remote end of the virtual link.
Select a
Timer Profile
or create a new Timer Profile to apply to the virtual link. This OSPF Interface Timer profile overrides the Global Interface Timer applied to OSPF and the OSPF Interface Timer profile applied to the interface.
Select an
Authentication
profile or create a new Authentication Profile to apply to the virtual link. This Authentication Profile overrides the Authentication Profile applied to the Area (on the Type tab) and the Authentication Profile applied to the interface.
Click
OK
.
Click
OK
to save the area.
Configure OSPF Graceful Restart and RFC 1583 compatibility for OSPFv2.
Select
Network
Routing
Logical Routers
and select the logical router.
Select
OSPF
Advanced
.
Select
rfc-1583 compatibility
to enforce compatibility with RFC 1583, which allows one best route to an autonomous system boundary router (ASBR) in the OSPF routing table. Default is disabled, which means the OSPF routing table can maintain multiple intra-AS paths in the routing table, thereby preventing routing loops.
Enable Graceful Restart
to enable OSPF Graceful Restart for the logical router. Default is enabled.
Enable Helper Mode
to enable the logical router to function in Graceful Restart helper mode. Default is enabled.
Enable Strict LSA Checking
to cause the helper router to stop performing helper mode and causes the graceful restart process to stop if a link-state advertisement indicates a network topology change. Default is enabled.
Specify the
Grace Period (sec)
—the number of seconds within which the logical router will perform a graceful restart if the firewall goes down or becomes unavailable; range is 5 to 1,800; default is 120.
Specify the
Max Neighbor Restart Time (sec)
; range is 5 to 1,800; default is 140.
Click
OK
.
Configure intra-area filtering to determine which OSPFv2 routes are placed in the global RIB.
You might learn OSPFv2 routes and redistribute them, but not want them in the global RIB; you might want to allow only specific OSPFv2 routes to the global RIB.
Select
Network
Routing
Logical Routers
and select a logical router.
Select
RIB Filter
.
To filter
IPv4
OSPFv2 routes for the global RIB, in the
OSPFv2 Route-Map
, select a Redistribution route map you created or create a new Redistribution Route Map in which the Source Protocol is OSPF and the Destination Protocol is RIB.
Click
OK
.
(
Optional
) Change the default administrative distances for OSPF intra area, inter area, and external routes within a logical router.
Commit
.
View advanced routing information for OSPFv2 and the link-state database (LSDB). The PAN-OS CLI Quick Start lists the commands in the CLI Cheat Sheet: Networking.