Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 - Manual (Page 209)

Brocade ICX 6650 Layer 3 Routing Configuration Guide 191
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Configuring OSPF
Refer to “Modifying virtual link parameters” on page 191 for descriptions of the optional
parameters.
Modifying virtual link parameters
OSPF has some parameters that you can modify for virtual links. Notice that these are the same
parameters as the ones you can modify for physical interfaces.
You can modify default values for virtual links using the following CLI command at the OSPF router
level of the CLI, as shown in the following syntax.
Syntax: area num | ip-addr virtual-link ip-addr [authentication-key [0 | 1] string] [dead-interval
num]
[hello-interval num] [md5-authentication key-activation-wait-time num | key-id num [0 | 1]
key string]
[retransmit-interval num] [transmit-delay num]
The parameters are described in the next section.
Virtual link parameter descriptions
You can modify the following virtual link interface parameters.
Authentication Key: This parameter allows you to assign different authentication methods on a
port-by-port basis. 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 simple password method of authentication requires you to configure an alphanumeric
password on an interface. The password can be up to eight characters long. The simple password
setting takes effect immediately. All OSPF packets transmitted on the interface contain this
password. All OSPF packets received on the interface are checked for this password. If the
password is not present, the packet is dropped.
The MD5 method of authentication encrypts the authentication key you define. The authentication
is included in each OSPF packet transmitted.
MD5 Authentication Key: When simple authentication is enabled, the key is an alphanumeric
password of up to eight characters. When MD5 is enabled, the key is an alphanumeric password of
up to 16 characters that is later encrypted and included in each OSPF packet transmitted. You
must enter a password in this field when the system is configured to operate with either simple or
MD5 authentication.
MD5 Authentication Key ID: The Key ID is a number from 1 through 255 and identifies the MD5
key that is being used. This parameter is required to differentiate among multiple keys defined on
a router.
MD5 Authentication Wait Time: This parameter determines when a newly configured MD5
authentication key is valid. This parameter provides a graceful transition from one MD5 key to
another without disturbing the network. All new packets transmitted after the key activation wait
time interval use the newly configured MD5 Key. OSPF packets that contain the old MD5 key are
accepted for up to five minutes after the new MD5 key is in operation.
The range for the key activation wait time is from 0 through 14400 seconds. The default value is
300 seconds.