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To configure the priority of IS-IS:
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.
Specify a priority for IS-IS.
preference
{
route-policy
route-policy-name
|
preference
} *
15 by default.
Configuring the maximum number of ECMP routes
Perform this task to implement load sharing over ECMP routes.
To configure the maximum number of ECMP 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.
Specify the maximum number
of ECMP routes for load
balancing.
maximum load-balancing
number
8 by default.
Configuring IS-IS route summarization
This task allows you to configure a summary route so routes falling into the network range of the summary
route are summarized into one route for advertisement. Doing so can reduce the size of routing tables, as
well as the scale of LSP and LSDB. Both IS-IS routes and redistributed routes can be summarized.
The router summarizes only the routes in the locally generated LSPs. The cost of the summary route is the
lowest one among the costs of summarized routes.
To configure route summarization:
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 IS-IS
route
summarization.
summary
ip-address
{
mask
|
mask-length
}
[
avoid-feedback
|
generate_null0_route
|
tag
tag
| [
level-1
|
level-1-2
|
level-2
] ] *
By default, no route summarization
is configured.
Advertising a default route
A router running IS-IS cannot redistribute any default routes or advertise a default route to neighbors. Use
the following commands to advertise a default route of 0.0.0.0/0 to the same level neighbors.
