R3303-HP HSR6800 Routers Layer 3 - IP Routing Configuration Guide

145
Ste
p
Command Remarks
2. Enter IS-IS view.
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
N/A
3. Advertise a default
route.
[ ipv4-unicast topology-name ]
default-route-advertise [ route-policy
route-policy-name | [ level-1 | level-1-2 |
level-2 ] ] *
By default, the function is disabled.
Configuring IS-IS route redistribution
Redistributing large numbers of routes on a device might 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.
Only active routes can be redistributed. To verify route state, use the display ip routing-table protocol
command.
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.
[ ipv4-unicast topology-name ] 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 ]
*
No route is redistributed by
default.
If no level is specified, routes are
redistributed into the Level-2
routing table by default.
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.
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.
By referencing a configured ACL, IP prefix list, or routing policy, you can filter the calculated routes. Only
the routes matching the filter can be added into the IS-IS routing table.
To filter routes calculated from received LSPs: