H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – IPv6 Routing
H3C S7500E Series Ethernet Switches Chapter 6 Routing Policy Configuration
6-3
z When receiving or advertising routing information, a routing protocol uses the
routing policy to filter routing information.
6.2 Defining Filtering Lists
6.2.1 Prerequisites
Before configuring this task, you need to decide on:
z IP-prefix list name
z Matching address range
z Extcommunity list sequence number
6.2.2 Defining an IPv6 Prefix List
Identified by name, each IPv6 prefix list can comprise multiple items. Each item
specifies a matching address range in the form of network prefix, which is identified by
index number.
During matching, the system compares the route to each item in the ascending order of
index number. If one item is matched, the route passes the IP-prefix list, without
needing to match the next item.
Follow these steps to define an IPv6 prefix list:
To do... Use the command... Remarks
Enter system view
system-view
—
Define an IPv6
prefix list
ip ipv6-prefix ipv6-prefix-name [ index
index-number ] { deny | permit }
ipv6-address prefix-length
[ greater-equal min-prefix-length ]
[ less-equal max-prefix-length ]
Required
Not defined by
default
 Note:
If all items are set to the deny mode, no routes can pass the IPv6 prefix list. Therefore,
you need to define the permit :: 0 less-equal 128 item following multiple deny mode
items to allow other IPv6 routing information to pass.
For example, the following configuration filters routes 2000:1::/48, 2000:2::/48 and
2000:3::/48, but allows other routes to pass.
<Sysname> system-view
[Sysname] ip ip-prefix abc index 10 deny 2000:1:: 48
[Sysname] ip ip-prefix abc index 20 deny 2000:2:: 48
[Sysname] ip ip-prefix abc index 30 deny 2000:3:: 16