HPE FlexNetwork 5510 HI Series Layer 3 - Ip Routing Configuration Guide

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Configuring a stub area
You can configure a non-backbone area at an AS edge as a stub area. To do so, execute the stub
command on all routers attached to the area. The routing table size is reduced because Type-5 LSAs
will not be flooded within the stub area. The ABR generates a default route into the stub area so all
packets destined outside of the AS are sent through the default route.
To further reduce the routing table size and routing information exchanged in the stub area, configure
a totally stub area by using the stub [ no-summary ] command on the ABR. AS external routes and
inter-area routes will not be distributed into the area. All the packets destined outside of the AS or
area will be sent to the ABR for forwarding.
A stub or totally stub area cannot have an ASBR because external routes cannot be distributed into
the area.
To configure an OSPF stub area:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter OSPF view.
ospf
[ process-id |
router-id
router-id |
vpn-instance
vpn-instance-name ] *
N/A
3. Enter area view.
area
area-id N/A
4. Configure the area as a
stub area.
stub
[
default-route-advertise-alwa
ys
|
no-summary
] *
By default, no stub area is configured.
5. (Optional.) Specify a cost
for the default route
advertised to the stub area.
default-cost
cost
The default setting is 1.
The
default-cost
cost command
takes effect only on the ABR of a stub
area or totally stub area.
Configuring an NSSA area
A stub area cannot import external routes, but an NSSA area can import external routes into the
OSPF routing domain while retaining other stub area characteristics.
Do not configure the backbone area as an NSSA area or totally NSSA area.
To configure an NSSA area, configure the nssa command on all the routers attached to the area.
To configure a totally NSSA area, configure the nssa command on all the routers attached to the
area and configure the nssa no-summary command on the ABR. The ABR of a totally NSSA area
does not advertise inter-area routes into the area.
To configure an NSSA area:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter OSPF view.
ospf
[ process-id |
router-id
router-id |
vpn-instance
vpn-instance-name ] *
N/A
3. Enter area view.
area
area-id N/A

HPE FlexNetwork 5510 HI Series Specifications

General

Brand	HPE
Model	FlexNetwork 5510 HI Series
Category	Switch
Language	English