H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – IPv6 Routing
H3C S7500E Series Ethernet Switches Chapter 6 Routing Policy Configuration
6-1
Chapter 6 Routing Policy Configuration
 Note:
At present, the LSQ1GP12EA boards in the S7500E series do not support IPv6.
6.1 Introduction to Routing Policy
6.1.1 Routing Policy
A routing policy is used on the router for route inspection, filtering, attributes modifying
when routes are received, advertised, or redistributed.
When distributing or receiving routing information, a router can use a routing policy to
filter routing information. For example, a router receives or advertises only routing
information that matches the criteria of a routing policy; a routing protocol redistributes
routes from another protocol only routes matching the criteria of a routing policy and
modifies some attributes of these routes to satisfy its needs using the routing policy.
To implement a routing policy, you need to define a set of match criteria according to
attributes in routing information, such as destination address, advertising router’s
address and so on. The match criteria can be set beforehand and then apply them to a
routing policy for route distribution, reception and redistribution.
6.1.2 Filters
Routing protocols can use six filters: ACL, IP prefix list, AS path ACL, community list,
extended community list and routing policy.
I. ACL
When defining an ACL, you can specify IP addresses and prefixes to match
destinations or next hops of routing information.
For ACL configuration, refer to the part discussing ACL operation.
II. IP prefix list
IP prefix list plays a role similar to ACL, but it is more flexible than ACL and easier to
understand. When an IP prefix list is applied to filtering routing information, its matching
object is the destination address of routing information.