346 CHAPTER 29: IS-IS CONFIGURATION
Configuring IS-IS Route
Leaking
With this feature enabled, the Level-1-2 router can advertise both Level-1 and
Level-2 area routing information to the Level-1 router.
Follow these steps to configure IS-IS route leaking:
n
■ If a filter policy is specified, only routes passing it can be advertised into Level-1
area.
■ You can specify a routing policy in the import-route isis level-2 into level-1
command to filter routes from Level-2 to Level-1. Other routing policies
specified for route reception and redistribution does not affect the route
leaking.
Tuning and
Optimizing IS-IS
Network
Configuration
Prerequisites
Before the configuration, accomplish the following tasks first:
■ Configure an IP address on each interface, and make sure all nodes are
reachable.
■ Configure basic IS-IS functions
Configuring a DIS
Priority for an Interface
On an IS-IS broadcast network, a router should be selected as the DIS at a specific
level, Level-1 or Level-2. You can specify a DIS priority at a level for an interface.
The bigger the interface’s priority value, the more likelihood it becomes the DIS.
Follow these steps to configure a DIS priority for an interface:
Configure a filtering
policy to filter
redistributed routes
filter-policy { acl-number | ip-prefix
ip-prefix-name | route-policy
route-policy-name } export [ isis
process-id | ospf process-id | rip
process-id | bgp | direct | static]
Optional
Not configured by default
To do… Use the command… Remarks
To do… Use the command… Remarks
Enter system view system-view --
Enter IS-IS view isis [ process-id ] --
Enable IS-IS route
leaking
import-route isis level-2 into level-1
[ filter-policy { acl-number | ip-prefix
ip-prefix-name | route-policy
route-policy-name } | tag tag ] *
Required
Disabled by default
To do… Use the command… Remarks
Enter system view system-view --
Enter interface view interface interface-type
interface-number
--
Specify a DIS priority for the
interface
isis dis-priority value
[ level-1 | level-2 ]
Optional
64 by default
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