3Com 3C13636 Configuration Manual page 889

3Com Router 3000 Ethernet Family
Configuration Guide
By default, the procedure index is 1.
Caution:
An OSPF procedure can only belong to one VPN instance, while one VPN instance
may contain multiple OSPF procedures. By default, an OSPF procedure belongs to
public network.
Step 2: Configure domain ID
Domain ID identifies an OSPF autonomous system (AS). Each procedure is configured
with one domain ID, but different procedures may have the same domain ID.
Table 3-20 Configure domain ID
Configure domain ID
Restore the default value
By default, id-number is 0 and id-addr is 0.0.0.0.
It is recommended that all OSPF instances in VPN be configured with the same domain
ID or the default value 0.
Caution:
The configured value will not take effect unit the command reset ospf is executed.
Step 3: Configure tag for redistributed VPN route (optional)
If a VPN site is linked to multiple PEs, routing ring may be caused when the routes
learned by MPLS/BGP are received by another PE router in being advertised by
category-5/-7 LSA of a PE to the VPN site. To solve this problem, you should configure
route-tag. It is recommended to configure identical route-tag for the PEs in the same
VPN.
Perform the following configurations in OSPF view.
Operation
3Com Corporation
3-27
Chapter 3 BGP/MPLS VPN Configuration
Command
domain-id { id-number | id-addr }
undo domain-id