This article provides some straightforward examples of configuring centralized data policy to influence traffic flow across the Viptela domain and to configure a vEdge router to be an Internet exit point.
General Centralized Data Policy Example
This section shows a general example of a centralized data policy to illustrate that you configure centralized data policy on a vSmart controller and that after you commit the configuration, the policy itself is pushed to the affected vEdge routers.
Here we configure a simple data policy on the vSmart controller vm9:
vm9# show running-config policy policy data-policy test-data-policy vpn-list test-vpn-list sequence 10 match destination-ip 172.16.0.0/24 ! action drop count test-counter ! ! default-action drop ! ! lists vpn-list test-vpn-list vpn 1 ! site-list test-site-list site-id 500 ! ! !
Then we apply this policy to the site list named test-site-list, which includes site 500:
vm9# show running-config apply-policy apply-policy site-list test-site-list data-policy test-data-policy ! !
Immediately after we activate the configuration on the vSmart controller, it pushes the policy configuration to the vEdge routers in site 500. One of these routers is vm5, where we see that the policy has been received:
vm5# show omp data-policy policy-from-vsmart data-policy test-data-policy vpn-list test-vpn-list sequence 10 match destination-ip 172.16.0.0/24 ! action drop count test-counter ! ! default-action drop ! ! lists vpn-list test-vpn-list vpn 1 ! ! !
This example shows a data policy that limits the type of packets that a source can send to a specific destination. Here, the host at source address 18.104.22.168 in site 100 and VPN 100 can send only TCP traffic to the destination host at 22.214.171.124. This policy also specifies the next hop for the TCP traffic sent by 126.96.36.199, setting it to be TLOC 10.10.10.10, color gold. All other traffic is accepted as a result of the default-action statement.
policy lists site-list north site-id 100 vpn-list vpn-north vpn 100 ! data-policy tcp-only vpn-list vpn-north sequence 10 match source-ip 188.8.131.52/32 destination-ip 184.108.40.206/32 protocol tcp action accept set tloc 10.10.10.10 color gold ! default-action accept ! ! apply-policy site north data-policy tcp-only
This examples illustrates how to disallow certain types of data traffic from being sent from between VPNs. This policy drops data traffic on port 25, which carries SMTP mail traffic, that originates in 220.127.116.11/16. However, the policy accepts all other data traffic, including non-SMTP traffic from 18.104.22.168/16.
policy lists data-prefix-list north-ones ip-prefix 22.214.171.124/16 port 25 vpn-list all-vpns vpn 1 vpn 2 site-list north site-id 100 ! data-policy no-mail vpn-list all-vpns sequence 10 match source-data-prefix-list north-ones action drop ! default-action accept ! ! apply-policy site north data-policy no-mail
Allow Traffic to Exit from a vEdge Router to the Internet
The following example allows data traffic destined for two prefixes on the Internet to exit directly from the local vEdge router to the Internet destination. Configure this policy on the vSmart controller.
policy lists vpn-list vpn-1 vpn 1 ! site-list nat-sites site-id 100,200 ! data-policy accept-nat vpn-list vpn-1 sequence 100 match source-ip 10.20.24.0/24 destination-ip 10.0.12.12/32 ! action accept count nat nat use-vpn 0 ! ! sequence 101 match source-ip 10.20.24.0/24 destination-ip 10.1.15.13/32 ! action accept count nat_inet nat use-vpn 0 ! ! default-action accept ! ! apply-policy site-list nat-sites data-policy accept-nat
Using the destination port instead of a destination IP prefix allows greater flexibility for traffic exiting to the Internet. Here, traffic can go to all HTTP and HTTPS sites (ports 80 and 443, respectively). Configure this policy on a vSmart controller.
data-policy accept-nat vpn-list vpn-1 sequence 100 match source-ip 10.20.24.0/24 destination-port 80 ! action accept count nat nat use-vpn 0 ! ! sequence 101 match source-ip 10.20.24.0/24 destination-port 443 ! action accept count nat_inet nat use-vpn 0 ! ! default-action accept ! !