Dell BigIron RX Series, Configuration Manual

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692 BigIron RX Series Configuration Guide
53-1002253-01
Configuring OSPF
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ip ospf hello-interval <value>
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ip ospf md5-authentication key-activation-wait-time <num> | key-id <num> [0 | 1] key
<string>
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ip ospf passive
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ip ospf priority <value>
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ip ospf retransmit-interval <value>
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ip ospf transmit-delay <value>
For a complete description of these parameters, see the summary of OSPF port parameters in the
next section.
OSPF interface parameters
The following parameters apply to OSPF interfaces
.
Area Assigns an interface to a specific area. You can assign either an IP address
or number to represent an OSPF Area ID. If you assign a number, it can be
any value from 0 – 2,147,483,647.
Auth-change-wait-time OSPF gracefully implements authentication changes to allow all routers to
implement the change and thus prevent disruption to neighbor
adjacencies. During the authentication-change interval, both the old and
new authentication information is supported. The default
authentication-change interval is 300 seconds (5 minutes). You change
the interval to a value from 0 – 14400 seconds.
Authentication-key OSPF supports three methods of authentication for each interface—none,
simple password, and MD5. Only one method of authentication can be
active on an interface at a time. The default authentication value is none,
meaning no authentication is performed.
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The simple password method of authentication requires you to
configure an alphanumeric password on an interface. The simple
password setting takes effect immediately. All OSPF packets
transmitted on the interface contain this password. Any OSPF packet
received on the interface is checked for this password. If the
password is not present, then the packet is dropped. The password
can be up to eight characters long.
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The MD5 method of authentication requires you to configure a key ID
and an MD5 Key. The key ID is a number from 1 – 255 and identifies
the MD5 key that is being used. The MD5 key can be up to sixteen
alphanumeric characters long.
Cost Indicates the overhead required to send a packet across an interface. You
can modify the cost to differentiate between 100 Mbps, 1Gbps, and 10
Gbps. The default cost is calculated by dividing 100 million by the
bandwidth. For 10 Mbps links, the cost is 10. The cost for 100 Mbps,
1Gbps, and 10 Gbps links is 1, because the speed of 100 Mbps and
10Gbps was not in use at the time the OSPF cost formula was devised.
Dead-interval Indicates the number of seconds that a neighbor router waits for a hello
packet from the current router before declaring the router down. The value
can be from 1 – 65535 seconds. By default, the dead timer interval is four
times the hello timer interval. The default is 40 seconds.
Hello-interval Represents the length of time between the transmission of hello packets.
The value can be from 1 – 65535 seconds. The default is 10 seconds. On
NBMA, the default is 30 seconds.