Configuring Route Redistribution; Configuring Route Filtering - H3C S7500 Series Operation Manual

Operation Manual – Routing Protocol
H3C S7500 Series Ethernet Switches

5.3.7 Configuring Route Redistribution

IS-IS processes the routes discovered by other routing protocols as routes outside a
routing domain. You can specify the default cost for IS-IS to redistribute routes from
another routing protocol.
You can configure IS-IS to redistribute routes to Level-1, Level-2, and Level-1-2.
Follow these steps to configure route redistribution:
To do...
Enter system view
Enter IS-IS view
Redistribute
routes from
another protocol
Note:
For more about routing information, refer to the section "Configuring an IP Routing
Policy".
Use the keyword allow-ibgp with care when redistributing routes from BGP,
because it redistributes IBGP routes without keeping the AS_PATH attribute,
which may lead to routing loops between ASs.

5.3.8 Configuring Route Filtering

IS-IS can filter received routes and advertised routes based on ACL numbers.
I. Configuring received route filtering
Follow these steps to configure received route filtering:
Enter system view
Enter IS-IS view
Set the policy for filtering
received routes
Use the command...
system-view
isis [ tag ]
import-route protocol
[ allow-ibgp ] [ cost value | type
{ external | internal } | [ level-1 |
level-1-2 | level-2 ] | route-policy
route-policy-name ]*
To do...
system-view
isis [ tag ]
filter-policy acl-number
import
Use the command...
5-11
Chapter 5 IS-IS Configuration
Remarks
—
—
Required
By default, IS-IS imports
no route from another
protocol.
Remarks
—
—
Required
By default, IS-IS does not
filter received routes.