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Cisco ONS 15454 SDH Procedure Guide, R7.2
October 2007
Chapter 19 DLPs D200 to D299
DLP- D250 Set Up or Change Open Shortest Path First Protocol
Step 5 Provision the OSPF priority and interval settings:
The OSPF priority and interval defaults are ones most commonly used by OSPF routers. Verify that these
defaults match the ones used by the OSPF router where the ONS 15454 SDH is connected:
• Router Priority—Selects the designated router for a subnet.
• Hello Interval (sec)—Sets the number of seconds between OSPF hello packet advertisements sent
by OSPF routers. Ten seconds is the default.
• Dead Interval—Sets the number of seconds that will pass while an OSPF router’s packets are not
visible before its neighbors declare the router down. Forty seconds is the default.
• Transit Delay (sec)—Indicates the service speed. One second is the default.
• Retransmit Interval (sec)—Sets the time that will elapse before a packet is resent. Five seconds is
the default.
• LAN Metric—Sets a cost for sending packets across the LAN. This value should always be lower
than the DCC metric. Ten is the default.
Step 6 Under OSPF Area Range Table, create an area range table if one is needed:
Note Area range tables consolidate the information that is outside an OSPF area border. One
ONS 15454 SDH in the ONS 15454 SDH OSPF area is connected to the OSPF router. An area
range table on this node points the router to the other nodes that reside within the
ONS 15454 SDH OSPF area.
a. Under OSPF Area Range Table, click Create.
b. In the Create Area Range dialog box, enter the following:
• Range Address—Enter the area IP address for the ONS 15454 SDH nodes that reside within the
OSPF area. For example, if the ONS 15454 SDH OSPF area includes nodes with IP addresses
10.10.20.100, 10.10.30.150, 10.10.40.200, and 10.10.50.250, the range address would be
10.10.0.0.
• Range Area ID—Enter the OSPF area ID for the ONS 15454 SDH nodes. This is either the ID
in the DCC OSPF Area ID field or the ID in the Area ID for LAN Port field.
• Mask Length—Enter the subnet mask length. In the Range Address example, this is 16.
• Advertise—Check if you want to advertise the OSPF range table.
c. Click OK.
Step 7 All OSPF areas must be connected to Area 0. If the ONS 15454 SDH OSPF area is not physically
connected to Area 0, use the following steps to create a virtual link table that will provide the
disconnected area with a logical path to Area 0:
a. Under OSPF Virtual Link Table, click Create.
b. In the Create Virtual Link dialog box, complete the following fields. OSPF settings must match
OSPF settings for the ONS 15454 SDH OSPF area.
• Neighbor—The router ID of the Area 0 router.
• Transit Delay (sec)—The service speed. One second is the default.
• Hello Int (sec)—The number of seconds between OSPF hello packet advertisements sent by
OSPF routers. Ten seconds is the default.
• Auth Type—If the router where the ONS 15454 SDH is connected uses authentication, choose
Simple Password. Otherwise, choose No Authentication.