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Advertising a default route
IS-IS cannot redistribute a default route to its neighbors. This task enables IS-IS to advertise a default route
of 0.0.0.0/0 in an LSP to the same-level neighbors. Upon receiving the default route, the neighbors add
it into their routing table.
To advertise a default route:
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.
Advertise a default
route.
default-route-advertise
[ [
level-1
|
level-1-2
|
level-2
] |
route-policy
route-policy-name
]
*
By default, IS-IS does not advertise
a default route.
Configuring IS-IS route redistribution
Perform this task to redistribute routes from other routing protocols into IS-IS. You can specify a cost for
redistributed routes and specify the maximum number of redistributed routes.
To configure IS-IS route redistribution from other routing protocols:
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.
Redistribute routes from
other routing protocols
or other IS-IS processes.
import-route
protocol
[
process-id
|
all-processes
|
allow-ibgp
]
[
allow-direct
|
cost
cost
|
cost-type
{
external
|
internal
} | [
level-1
|
level-1-2
|
level-2
] |
route-policy
route-policy-name
|
tag
tag
] *
By default, no route is redistributed.
By default, if no level is specified, this
command redistributes routes into the
Level-2 routing table.
This command redistributes only
active routes. To display active
routes, use the
display ip
routing-table
protocol
command.
4.
(Optional.) Configure
the maximum number of
redistributed Level
1/Level 2 IPv4 routes.
import-route limit
number
By default, the maximum number of
redistributed Level 1/Level 2 IPv4
routes is 500000.
