BigIron RX Series Configuration Guide 88753-1002253-01Configuring ISIS properties on an interface 28NOTEThe BigIron RX advertises an IS-IS interface to its area regardless of whether adjacency formation isenabled.To disable IS-IS adjacency formation on an interface, enter commands such as the following.BigIron RX(config)# interface ethernet 2/8BigIron RX(config-if-e1000-2/8)# isis passiveThis command disables IS-IS adjacency formation on port 2/8. The device still advertises this IS-ISinterface into the area, but does not allow the port to form an adjacency with the IS at the other endof the link.Syntax: [no] isis passiveSetting the priority for designated IS electionThe priority of an IS-IS interface determines the priority of the interface for being elected as aDesignated IS. Level-1 has a Designated IS and Level-2 has a Designated IS. The Level-1 andLevel-2 Designated ISs are independent, although the same device can become both the Level-1Designated 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 valuefrom 0 – 127. You can configure the same priority for both Level-1 and Level-2 or you can configurea different priority for each level. In case of a tie (if two or more devices have the highest prioritywithin a given level), the device with the highest MAC address becomes the Designated IS for thatlevel.NOTEYou 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 2/8BigIron RX(config-if-e1000-2/8)# isis priority 127This command sets the IS-IS priority on port 1/1 to 127. Since the command does not specifyLevel-1 or Level-2, the new priority setting applies to both IS-IS levels.Syntax: [no] isis priority [level-1 | level-2]The parameter specifies the priority and can be from 0 – 127. A higher numeric valuemeans 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, thepriority is applied to both levels.Limiting access to adjacencies with a neighborIn addition to limiting access to an area (level-1) or domain (level-2), you can limit access to formingan IS-IS adjacency on a specific interface by entering a password at the interface configurationlevel. To enter this password, enter a command such as the following.BigIron RX(config)# interface ethernet 2/8BigIron RX(config-if-e1000-2/8)# isis password my-passwordSyntax: [no] isis password
