3Com 8800 Configuration Manual page 457

3Com Switch 8800 Configuration Guide
3) Configure vpn-instance description
Perform the following configuration in vpn-instance view
Table 37-5 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.
Table 37-6 Configure vpn-target attribute for the vpn-instance
Configure vpn-target attribute for the
vpn-instance
Delete the specified route-target
attribute from the vpn-target attribute
list associated with the vpn-instance
Operation
instance defines input
Operation
Chapter 37 BGP/MPLS VPN Configuration
description vpn-instance-description
undo description
routing attribute
vpn-target
[ import-extcommunity
export-extcommunity | both ]
undo vpn-target vpn-target-extcommunity
[ import-extcommunity
export-extcommunity | both ]
37-13
Command
list according to
Command
vpn-target-extcommunity
the
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