- Cisco ONS 15454 Manual

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Cisco ONS 15454 Installation and Operations Guide
November 2001
Chapter 4 IP Networking
ONS 15454 IP Addressing Scenarios
The OSPF priority and intervals default to values most commonly used by OSPF routers. In the Priority
and Invervals area, verify that these values match those used by the OSPF router where the ONS 15454
is connected.
• Router Priority—Used to select 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 7 In the OSPF Area Range Table area, complete the following:
Area range tables consolidate the information that is propagated outside an OSPF Area border. One ONS
15454 in the ONS 15454 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 OSPF area.
To create an area range table:
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 15454s that reside within the OSPF area.
For example, if the ONS 15454 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 15454s. 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 8 All OSPF areas must be connected to Area 0. If the ONS 15454 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 OSPF area):
Neighbor—Enter 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 is connected uses authentication, select Simple
Password. Otherwise, set it to No Authentication.
Retransmit Int (sec)—Sets the time that will elapse before a packet is resent. Five seconds is the
default.