H3C S9500 Series Operation Manual page 15

Operation Manual – MPLS L3VPN
H3C S9500 Series Routing Switches
Perform the following configuration in VPN-instance view to configure VPN-instance
description:
Configure VPN-instance description
Delete VPN-instance description
4) Configure VPN-target attribute for the VPN-instance
VPN-target attribute, a BGP extension community attribute, controls advertisement of
VPN routing information.
The following is the advertisement controlling process of VPN routing information:
When BGP is imported into a VPN route learned at CE, it associates a VPN-target
extension community attribute list for the route. Usually the list is the VPN-instance
output routing attribute list which is associated with CE.
VPN
import-extcommunity in VPN-target, defines the acceptable route range and
import it.
VPN instance modifies VPN-target attributes for the routes to be advertised,
according to the export-extcommunity in VPN-target.
Like an RD, an extension community includes an ASN plus an arbitrary number or an IP
address plus an arbitrary number. There are two types of formats:
The first one is related to autonomous system number (ASN), in the form of 16-bit ASN
(can be 0 here): 32-bit user-defined number, for example, 100:1.
The second one is related to IP address, in the form of 32-bit IP address (can be 0.0.0.0
here):16-bit user-defined number, for example, 172.1.1.1:1.
Perform the following configuration in the VPN-instance view to create VPN-target
extended community for the VPN-instance:
Configure VPN-target extended
community for the VPN-instance
Delete the specified VPN-target attribute
from the VPN-target attribute list
associated with the VPN-instance
By default, the value is both. In general all Sites in a VPN can be interconnected, and
the import-extcommunity and export-extcommunity attributes are the same, so you
can execute the command only with the both option.
To do...
instance defines input
To do...
Chapter 1 MPLS L3VPN Configuration
Use the command...
description vpn-instance-description
undo description
routing attribute
Use the command...
vpn-target vpn-target-extcommunity
[ import-extcommunity |
export-extcommunity | both ]
undo vpn-target
vpn-target-extcommunity
[ import-extcommunity |
export-extcommunity | both ]
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list according to the