Dell Brocade DCX, Руководство по настройке

Страница: 771 / 1436

BigIron RX Series Configuration Guide 699
53-1001810-01
Configuring OSPF
25
When encryption of the passwords or authentication strings is enabled, they are encrypted in the
CLI regardless of the access level you are using. The encryption option can be omitted (the default)
or can be one of the following:
•
0 – Disables encryption for the password or authentication string you specify with the
command. The password or string is shown as clear text in the running configuration and the
startup configuration file. Use this option of you do not want display of the password or string
to be encrypted.
•
1 – Assumes that the password or authentication string you enter is the encrypted form, and
decrypts the value before using it.
NOTE
If you want the software to assume that the value you enter is the clear-text form, and to encrypt
display of that form, do not enter 0 or 1. Instead, omit the encryption option and allow the software
to use the default behavior.
If you specify encryption option 1, the software assumes that you are entering the encrypted form
of the password or authentication string. In this case, the software decrypts the password or string
you enter before using the value for authentication. If you accidentally enter option 1 followed by
the clear-text version of the password or string, authentication will fail because the value used by
the software will not match the value you intended to use.
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:
•
Trunk group – The combined bandwidth of all the ports.
•
Virtual interface – The combined bandwidth of all the ports in the port-based VLAN that
contains the virtual interface.