An OSPF process belongs to only one VPN instance. If you run an OSPF process
without binding it to a VPN instance, this process is considered as a public network
process. An OSPF process that belongs to a public network cannot be bound with a
VPN instance.
The OSPF processes that are bound to the VPN instance do not use the public network
Router ID configured in the system view. You need to specify the router ID when
starting an OSPF process. Otherwise, according to the router ID selecting rule, the IP
address of any interface that is bound to the VPN instance is selected as the router ID
in the OSPF process.
3. (Optional) Run:
domain-id domain-id [ secondary ]
The domain ID is configured.
The domain ID can be expressed by an integer or in dotted decimal notation.
You can configure two domain IDs for each OSPF process. The domain IDs of
different processes are independent of each other.
There is no limitation to configure the domain IDs of the OSPF processes in different
VPNs on the PE. But, all the OSPF processes in one VPN should be configured with
the same domain ID to ensure correct routing advertisement.
The domain ID of an OSPF process is contained in the routes generated by this process.
When the OSPF routes are imported into BGP, the domain ID is added into the BGP
VPN route and is transmitted as the BGP extended community attribute.
By default, the domain ID is 0.
4. (Optional) Run:
route-tag tag
The VPN route tag is configured.
By default, OSPF automatically allocates the VPN route tag according to the
algorithm:
– If the BGP process is not started on the local device, the tag value is 0 by default.
– If the BGP process is started on the local device, the first two bytes of the tag value
are fixed as 0xD000, and the last two bytes are the local AS number by default.
That is, the tag value equals 3489660928 plus the local AS number.
5. Run:
import-route bgp [ cost cost | route-policy route-policy-name | tag tag |
type type ]
*
The BGP route is imported.
6. Run:
area area-id
The OSPF area view is displayed.
7. Run:
network ip-address wildcard-mask
OSPF is run on the network segment where the interface bound to the VPN instance
resides.
Quidway S7700 Smart Routing Switch
Configuration Guide - VPN 3 BGP MPLS IP VPN Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
114
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