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Configuring route related attributes for a VPN instance
The control process of VPN route advertisement is as follows:
• When a VPN route learned from a CE gets redistributed into BGP, BGP associates it with a route
target extended community attribute list, which is usually the export target attribute of the VPN
instance associated with the CE.
• The VPN instance determines which routes it can accept and redistribute according to the
import-extcommunity in the route target.
• The VPN instance determines how to change the route targets attributes for routes to be advertised
according to the export-extcommunity in the route target.
IMPORTANT:
Create a routing policy before associating it with a VPN instance. Otherwise, the device cannot filter the
routes to be received and advertised.
To configure route related attributes for a VPN instance:
Ste
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter VPN instance view.
ip vpn-instance vpn-instance-name
N/A
3. Enter IPv6 VPN view.
ipv6-family Optional.
4. Configure route targets.
vpn-target vpn-target&<1-8>
[ both | export-extcommunity |
import-extcommunity ]
A single vpn-target command can
configure up to eight route targets.
You can configure up to 64 route
targets for a VPN instance.
5. Set the maximum number of
routes supported.
routing-table limit number
{ warn-threshold | simply-alert }
Optional.
Setting the maximum number of
routes for a VPN instance to
support is for preventing too many
routes from being redistributed into
the PE.
6. Apply an import routing
policy.
import route-policy route-policy
Optional.
By default, all routes matching the
import target attribute are
accepted.
7. Apply an export routing
policy.
export route-policy route-policy
Optional.
By default, routes to be advertised
are not filtered.
NOTE:
• Route related attributes configured in VPN instance view are applicable to both IPv4 VPNs and IPv6
VPNs.
• You can configure route related attributes for IPv6 VPNs in both VPN instance view and IPv6 VPN view.
Those configured in IPv6 VPN view take precedence.
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