H3C Technologies H3C S12500 Series Switches - Manual (Page 94)

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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 an
NSSA area.
nssa [ default-route-advertise |
no-import-route | no-summary |
translate-always |
translator-stability-interval value ] *
Not configured by default.
5. Specify a cost for the default
route advertised to the
NSSA area. default-cost cost
Optional.
Defaults to 1.
The default-cost command is
available only on the ABR/ASBR
of an NSSA area.
Configuring a virtual link
Non-backbone areas exchange routing information through the backbone area. Connectivity between
the backbone and non-backbone areas and within the backbone must be available.
You can configure virtual links to ensure the connectivity when physical links are not enough.
To configure a virtual link:
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 a virtual link.
vlink-peer router-id [ hello seconds
| retransmit seconds | trans-delay
seconds | dead seconds | { simple
[ cipher | plain ] password |
{ hmac-md5 | md5 } key-id [ cipher
| plain ] password } ] *
Configure this command on both
ends of a virtual link.
hello and dead intervals must be
identical on both ends of the virtual
link.
NOTE:
•
Virtual links cannot transit a stub area, totally stub area, NSSA area, or totally NSSA area.
• MD5/HMAC-MD5 authentication supports key rollover. For more information, see " Configuring OSPF
authentication ."
Configuring OSPF network types
OSPF classifies networks into the following types: broadcast, NBMA, P2MP, and P2P, upon the link layer
protocol.