Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 314)

286 Multi-Service IronWare Routing Configuration Guide
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Configuring ISIS properties on an interface
Syntax: [no] ip router isis
Disabling or re-enabling formation of adjacencies
When you enable IS-IS on any type of interface except a loopback interface, the interface also is
enabled to send advertisements and form an adjacency with an IS at the other end of the link by
default. Adjacency formation and advertisements are disabled by default on loopback interfaces.
You can enable or disable adjacency formation and advertisements on an interface.
NOTE
The Brocade device advertises an IS-IS interface to its area regardless of whether adjacency
formation is enabled.
To disable IS-IS adjacency formation on an interface, enter commands such as the following.
Brocade(config)# interface ethernet 2/8
Brocade(config-if-e1000-2/8)# isis passive
This command disables IS-IS adjacency formation on port 2/8. The device still advertises this IS-IS
interface into the area, but does not allow the port to form an adjacency with the IS at the other end
of the link.
Syntax: [no] isis passive
Setting the priority for designated IS election
The priority of an IS-IS interface determines the priority of the interface for being elected as a
Designated IS. Level-1 has a Designated IS and Level-2 has a Designated IS. The Level-1 and
Level-2 Designated ISs are independent, although the same device can become both the Level-1
Designated IS and the Level-2 Designated IS.
By default, the Level-1 and Level-2 priority is 64. You can configure an interface’s priority to a value
from 1 – 127. You can configure the same priority for both Level-1 and Level-2 or you can configure
a different priority for each level. In case of a tie (if two or more devices have the highest priority
within a given level), the device with the highest MAC address becomes the Designated IS for that
level.
NOTE
You can set the IS-IS priority on an individual interface basis only. You cannot set the priority globally.
To set the IS-IS priority on an interface, enter commands such as the following.
Brocade(config)# interface ethernet 2/8
Brocade(config-if-e1000-2/8)# isis priority 127
This command sets the IS-IS priority on port 1/1 to 127. Since the command does not specify
Level-1 or Level-2, the new priority setting applies to both IS-IS levels.
Syntax: [no] isis priority num [level-1 | level-2]
The num parameter specifies the priority and can be from 1 – 127. A higher numeric value means
a higher priority. The default is 64.
The level-1 | level-2 parameter applies the priority to Level-1 only or Level-2 only. By default, the
priority is applied to both levels.