Creating A Sham Link; Configuring Routing On An Mce; Configuration Prerequisites - HP 12500 Series Configuration Manual

Creating a sham link

To create a sham link:
To do...
Enter system view
Enter OSPF view
Configure the external route tag for
imported VPN routes
Enter OSPF area view
Configure a sham link
NOTE:
If you start OSPF but do not configure the router ID, the system will automatically elect one. However, the
•
same election rules produce the same router ID. HP recommends that you configure the router ID when
starting an OSPF process. For the election rules, see
• If you configure multiple OSPF VPN instances but do not configure the route tag, the system will
automatically create one based on the AS number configured. If you do not configure BGP, the tag will
be 0. However, the same calculation rule produces the same tag, and hence the same tag will be created
for multiple OSPF VPN instances on the same PE or PEs with the same AS number. Therefore, HP
recommends configuring different tags for different OSPF VPN instance.

Configuring routing on an MCE

MCE implements service isolation through route isolation. MCE routing configuration includes:
MCE-VPN site routing configuration
•
MCE-PE routing configuration
•
On the PE in an MCE network environment, disable routing loop detection to avoid route loss during
route calculation and disable route redistribution between routing protocols to save system resources.

Configuration prerequisites

Before you configure routing on an MCE, complete the following tasks:
• On the MCE, configure VPN instances, and bind the VPN instances with the interfaces connected
to the VPN sites and those connected to the PE.
Configure the link layer and network layer protocols on related interfaces to ensure IP connectivity.
•
Use the command...
system-view
ospf [ process-id | router-id router-id |
vpn-instance vpn-instance-name ] *
route-tag tag-value
area area-id
sham-link source-ip-address
destination-ip-address [ cost cost | dead
dead-interval | hello hello-interval |
retransmit retrans-interval | trans-delay
delay | simple [ cipher | plain ] password
| { md5 | hmac-md5 } key-id [ cipher |
plain ] password ]*
Layer 3—IP Routing Configuration Guide
235
Remarks
—
—
Required
Required
Required
By default, no sham link is
configured.
.