Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 269)

md5-
authentication key
string The MD5 key is a number from 1 - 255 and identifies the MD5 key that is being used. This
parameter is required to differentiate among multiple keys defined on a router.
When MD5 is enabled, the key-string 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.
By default, the MD5 authentication key is encrypted. If you want the authentication key to be
in clear text, insert a 0 between key and string. For example,
device(config-ospf-router)# area 1 virtual-link 10.0.0.1 md-5-
authentication key-id 5 key evening
The software adds a prefix to the authentication key string in the configuration. For example,
the following portion of the code has the encrypted code "2".
device(config-ospf-router)# area 1 virtual-link 12.12.12.25 md-5-
authentication key-id 5 key 2 $on-o
The prefix can be one of the following:
• 0 = the key string is not encrypted and is in clear text
• 1 = the key string uses proprietary simple cryptographic 2-way algorithm
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 - 14400 seconds. The default value is
300 seconds.
Changing the reference bandwidth for the cost on OSPF interfaces
Each interface on which OSPF is enabled has a cost associated with it. The device advertises its
interfaces and their costs to OSPF neighbors. For example, if an interface has an OSPF cost of ten, the
device advertises the interface with a cost of ten to other OSPF routers.
By default, an interface’s OSPF cost is based on the port speed of the interface. The cost is calculated
by dividing the reference bandwidth by the port speed. The default reference bandwidth is 100 Mbps,
which results in the following default costs:
• 10 Mbps port - 10
• All other port speeds - 1
You can change the reference bandwidth, to change the costs calculated by the software.
The software uses the following formula to calculate the cost:
Cost = reference-bandwidth/interface-speed
If the resulting cost is less than 1, the software rounds the cost up to 1. The default reference bandwidth
results in the following costs:
• 10 Mbps port’s cost = 100/10 = 10
• 100 Mbps port’s cost = 100/100 = 1
• 1000 Mbps port’s cost = 100/1000 = 0.10, which is rounded up to 1
• 10 Gbps port’s cost = 100/10000 = 0.01, which is rounded up to 1
The bandwidth for interfaces that consist of more than one physical port is calculated as follows:
Changing the reference bandwidth for the cost on OSPF interfaces
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