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Controlling the Receiving and Sending of VPN Routes by Using Routing Policies
Context
The ASBRs accept all VPNv6 routes after they are configured not to filter VPNv6 routes by VPN targets. When there are many VPN routes on the network, the ASBRs are overburdened.
If only some of VPNs or sites need to communicate across ASs, you can configure a routing policy on the ASBRs to restrict the VPNv6 routes that can be accepted by the ASBRs. This reduces loads on the ASBRs.
This
section describes how to configure the following filtering policies
to control VPNv6 route advertisement and acceptance:
- Filtering policy based VPN targets
- Filtering policy based on RDs
Procedure
- Run:
system-viewThe system view is displayed.
- Run either of the following command to configure
a route filter.
- To configure an extended community filter, run the ip extcommunity-filter extcomm-filter-number { permit | deny } { rt { as-number:nn | ipv4-address:nn } } &<1-16> command.
- To configure an RD filter, run the ip rd-filter rd-filter-number { deny | permit } route-distinguisher &<1-10> command.
- Run:
route-policy route-policy-name permit node node
The routing policy is configured.
- Run either of the following command to configure an if-match
clause in the configured route filter:
- If you configured an extended community filter in 2, run the if-match extcommunity-filter { { basic-extcomm-filter-num | advanced-extcomm-filter-num } &<1-16> | advanced-extcomm-filter-name | basic-extcomm-filter-name } command to configure an if-match clause based on the extended community filter in the routing policy.
- If you configured an RD filter in 2, run the if-match rd-filter rd-filter-number command to configure an if-match clause based on the RD filter in the routing policy.
- Run:
quitReturn to the system view.
- Run:
bgp { as-number-plain | as-number-dot }
The BGP view is displayed.
- Run:
ipv6-family vpnv6
The BGP-VPNv6 address family is displayed.
- Run:
peer ipv4-address route-policy route-policy-name { export | import }
The routing policy is applied to controlling the VPN IPv6 routing information.
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