Dell PowerConnect B-RX - Setting the Priority for Designated IS Election; Limiting Access to Adjacencies with a Neighbor

BigIron RX Series Configuration Guide 887
53-1002253-01
Configuring ISIS properties on an interface
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NOTE
The BigIron RX 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.
BigIron RX(config)# interface ethernet 2/8
BigIron RX(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 0 – 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.
BigIron RX(config)# interface ethernet 2/8
BigIron RX(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 0 – 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.
Limiting access to adjacencies with a neighbor
In addition to limiting access to an area (level-1) or domain (level-2), you can limit access to forming
an IS-IS adjacency on a specific interface by entering a password at the interface configuration
level. To enter this password, enter a command such as the following.
BigIron RX(config)# interface ethernet 2/8
BigIron RX(config-if-e1000-2/8)# isis password my-password
Syntax: [no] isis password <string>