Configuring An Nssa Area; Configuring A Virtual Link - HP HPE FlexNetwork 7500 series Configuration Manual

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
1. Enter system view.
2. Enter OSPF view.
3. Enter area view.
4. Configure the area as an
NSSA area.
5. (Optional.) Set a cost for
the default route advertised
to the NSSA area.

Configuring a virtual link

Virtual links are configured for connecting backbone area routers that have no direct physical links.
To configure a virtual link:
Step
1. Enter system view.
2. Enter OSPF view.
3. Enter area view.
4. Configure a virtual link.
Command
system-view
ospf [ process-id | router-id
router-id | vpn-instance
vpn-instance-name ] *
area area-id
nssa [ default-route-advertise
[ cost cost-value | nssa-only |
route-policy route-policy-name |
type type ] * | no-import-route |
no-summary | suppress-fa |
[ [ [ translate-always ]
[ translate-ignore-checking-bac
kbone ] ] | translate-never ] |
translator-stability-interval
value ] *
default-cost cost-value
Command
system-view
ospf [ process-id | router-id
router-id | vpn-instance
vpn-instance-name ] *
area area-id
vlink-peer router-id [ dead
seconds | hello seconds |
{ { hmac-md5 | md5 } key-id
{ cipher | plain } string | keychain
keychain-name | simple { cipher
| plain } string } | retransmit
seconds | trans-delay seconds ] *
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Remarks
N/A
N/A
N/A
By default, no area is configured as
an NSSA area.
The default setting is 1.
This command takes effect only on
the ABR/ASBR of an NSSA or
totally NSSA area.
Remarks
N/A
N/A
N/A
By default, no virtual links exist.
Configure this command on both
ends of a virtual link. The hello and
dead intervals must be identical on
both ends of the virtual link.