Brocade BigIron RX Series Configuration Guide - Manual (Page 1043)

BigIron RX Series Configuration Guide 965
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Configuring ISIS properties on an interface
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Disabling and enabling IS-IS on an interface
In addition to enabling IS-IS globally, you also must enable the protocol on the individual interfaces
connected to ISs or ESs. To enable IS-IS locally on specific interfaces, enter commands such as the
following.
BigIron RX(config)#router isis
BigIron RX(config)# interface ethernet 1/1
BigIron RX(config-if-1/1)# ip router isis
BigIron RX(config-if-1/1)# exit
BigIron RX(config)# interface ethernet 1/2
BigIron RX(config-if-1/2)# ip router isis
These commands enable IS-IS on ports 1/1 and 1/2. The NET configured above (at the IS-IS
configuration level) applies to both interfaces.
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 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.