H3C Technologies H3C SR8800 - Manual (Page 316)

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NOTE:
•
You cannot remove an OSPFv3 area directly. Only when you remove all configurations in area view and
all interfaces attached to the area become down, can the area be removed.
• All the routers attached to a stub area must be configured with the stub command. The keyword
no-summary is only available on the ABR of the stub area.
• If you use the stub command with the keyword no-summary on an ABR, the ABR advertises a default
route in a Summary-LSA into the stub area. No AS-external-LSA, Inter-Area-Prefix-LSA or
Inter-Area-Router-LSA is advertised in the area. The stub area of this kind is also known as a “totally stub
area.”
Configuring an OSPFv3 virtual link
You can configure a virtual link to maintain connectivity between a non-backbone area and the
backbone, or in the backbone itself.
To configure a virtual link:
Step Command
1. Enter system view. system-view
2. Enter OSPFv3 view. ospfv3 [ process-id ]
3. Enter OSPFv3 area view. area area-id
4. Configure a virtual link.
vlink-peer router-id [ hello seconds | retransmit seconds |
trans-delay seconds | dead seconds | instance instance-id ] *
NOTE:
•
Both ends of a virtual link are ABRs that must be configured with the vlink-peer command.
• Do not configure virtual links in the areas of a GR-capable process.
Configuring OSPFv3 network types
OSPFv3 classifies networks into the following types by the link layer protocol:
By default, the default OSPFv3 interface network types vary with the link layer protocols of the interfaces:
• When the link layer protocol is PPP, OSPFv3 considers the network type as P2P by default.
• When the link layer protocol is Ethernet, OSPFv3 considers the network type as broadcast by
default.
You can change the network type of an OSPFv3 interface as needed. For example:
• An NBMA network must be fully connected. Any two routers in the network must be directly
reachable to each other through a virtual circuit. In the event no such direct link is available, you
must change the network type through a command.
• If direct connections are not available between some routers in an NBMA network, the type of
interfaces associated should be configured as P2MP, or as P2P for interfaces with only one
neighbor.