Brocade Virtual ADX Switch and Router Guide (Supporting ADX v03.1.00) - Manual (Page 128)

114 Brocade Virtual ADX Switch and Router Guide
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Configuring OSPF
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Port default values can be modified using the following CLI commands at the interface
configuration level of the CLI:
• ip ospf area ip-addr
• ip ospf auth-change-wait-time secs
• ip ospf authentication-key [0 | 1] string
• ip ospf cost num
• ip ospf dead-interval value
• ip ospf hello-interval value
• ip ospf md5-authentication key-activation-wait-time num | key-id num [0 | 1] key string
• ip ospf passive
• ip ospf priority value
• ip ospf retransmit-interval value
• ip ospf transmit-delay value
For a complete description of these parameters, refer to 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:
• 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.
• 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 and 1000 Mbps (1 Gbps) links. The default cost is calculated by
dividing 100 million by the bandwidth. For 10 Mbps links, the cost is 10. The cost for both 100
Mbps and 1000 Mbps links is 1, because the speed of 1000 Mbps 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.
The default is 40 seconds.