R3721-F3210-F3171-HP High-End Firewalls Network Management Configuration Guide-6PW101

489
Ste
p
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. Advertise a default
route.
default-route-advertise [ route-policy
route-policy-name | [ level-1 | level-1-2 |
level-2 ] ] *
By default, the function is disabled.
NOTE:
The default route is only advertised to routers at the same level. You can use a routing policy to
g
enerate
the default route only when a local routing entry is matched by the policy.
Configuring IS-IS route redistribution
Redistributing large numbers of routes on a device may affect the performance of other devices in the
network. If this happens, you can configure a limit on the number of redistributed routes in order to limit
the number of routes to be advertised.
To configure IS-IS route redistribution from other routing protocols:
Ste
p
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. Redistribute routes
from another
routing protocol.
import-route protocol [ process-id |
all-processes | allow-ibgp ] [ 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,
routes are redistributed into the
Level-2 routing table.
4. Configure the
maximum number
of redistributed
Level 1/Level 2
IPv4 routes.
import-route limit number
Optional.
By default, the maximum number of
redistributed Level 1/Level 2 IPv4
routes is 500000.
NOTE:
Only active routes can be redistributed. Use the display ip routing-table protocol command to display
route state information.
Configuring IS-IS route filtering
You can reference a configured ACL, IP prefix list, or routing policy to filter routes calculated from the
received LSPs and the routes redistributed from other routing protocols.
Filtering routes calculated from received LSPs
IS-IS saves the LSPs received from neighbors in the LSDB, uses the SPF algorithm to calculate the shortest
path tree with itself as the root, and installs the routes into the IS-IS routing table.