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You can configure IS-IS to advertise routes from Level-2 to Level-1, and to not advertise routes from Level-1
to Level-2.
To configure IS-IS route leaking:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter IS-IS IPv4 unicast
address family view.
1.
isis
[
process-id
] [
vpn-instance
vpn-instance-name
]
2.
cost-style
{
wide
|
wide-compatible
}
3.
address-family ipv4
[
unicast
]
N/A
3.
Configure route
leaking from Level-1 to
Level-2.
import-route isis level-1
into level-2
[
filter-policy
{
acl-number
|
prefix-list
prefix-list-name
|
route-policy
route-policy-name
} |
tag
tag
] *
By default, IS-IS advertises
routes from Level-1 to
Level-2.
4.
Configure route
leaking from Level-2 to
Level-1.
import-route isis level-2 into level-1
[
filter-policy
{
acl-number
|
prefix-list
prefix-list-name
|
route-policy
route-policy-name
} |
tag
tag
] *
By default, IS-IS does not
advertise routes from
Level-2 to Level-1.
Tuning and optimizing IS-IS networks
Configuration prerequisites
Before you tune and optimize IS-IS networks, complete the following tasks:
•
Configure IP addresses for interfaces to ensure IP connectivity between neighboring nodes.
•
Enable IS-IS.
Specifying the interval for sending IS-IS hello packets
If a neighbor does not receive any hello packets from the router within the advertised hold time, it
considers the router down and recalculates the routes. The hold time is the hello multiplier multiplied by
the hello interval.
To specify the interval for sending hello packets:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter interface view.
interface
interface-type
interface-number
N/A
3.
Specify the interval for
sending hello packets.
isis timer hello
seconds
[
level-1
|
level-2
]
The default setting is 10 seconds.
The interval between hello packets
sent by the DIS is 1/3 the hello
interval set with the
isis timer hello
command.
