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To filter routes calculated from received LSPs:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter IS-IS view.
isis
[
process-id
] [
vpn-instance
vpn-instance-name
]
N/A
3.
Filter routes calculated
from received LSPs.
filter-policy
{
acl-number
|
ip-prefix
ip-prefix-name
|
route-policy
route-policy-name
}
import
By default, no filtering is
configured.
Filtering redistributed routes
IS-IS can redistribute routes from other routing protocols (or other IS-IS processes), add them into the IS-IS
routing table, and advertise them in LSPs.
By reference a configured ACL, IP prefix list, or routing policy, you can filter redistributed routes and only
the routes matching the filter can be added into the IS-IS routing table and advertised to neighbors.
To configure the filtering of redistributed routes:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter IS-IS view.
isis
[
process-id
] [
vpn-instance
vpn-instance-name
]
N/A
3.
Configure the filtering of
routes redistributed from
another routing protocol or
IS-IS process.
filter-policy
{
acl-number
|
ip-prefix
ip-prefix-name
|
route-policy
route-policy-name
}
export
[
protocol
[
process-id
] ]
Not configured by
default.
Configuring IS-IS route leaking
With IS-IS route leaking enabled, the Level-1-2 router can advertise the routing information of other Level-1
areas and Level-2 area routing information to Level-1 routers.
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.
To configure IS-IS route leaking:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter IS-IS view.
isis
[
process-id
] [
vpn-instance
vpn-instance-name
]
N/A
3.
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
] *
Disabled by
default.
