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Option: Using IPSec with a Layer 3 VPN

Some key concepts to keep in mind when configuring IPSec within a VPN include the following:

  • Add the outside services interface for a next-hop style service set into the routing instance by including the interface sp-fpc/pic/port statement at the [edit routing-instances instance-name] hierarchy level.
  • For interface style service sets, add the interface on which you apply the service set and the services interface by including both interfaces at the [edit routing-instances instance-name] hierarchy level.
  • To define a routing instance for the local gateway within the service set, include the routing-instance instance-name option at the [edit services service-set service-set-name ipsec-vpn-options local-gateway address] hierarchy level.

The following configuration for an AS PIC on a provider edge (PE) router demonstrates the use of next-hop service sets with an IKE dynamic SA in a VPN routing and forwarding (VRF) routing instance.

[edit]interfaces {so-0/0/0 {description "Interface connected to the customer edge (CE) router";unit 0 {family inet {address;}}}so-2/2/0 {description "Source IPSec tunnel interface to the network core";unit 0 {family inet {address;}}}sp-3/1/0 {description "AS PIC interface";unit 0 {family inet {address;}}unit 1 {family inet;service-domain inside;}unit 2 {family inet;service-domain outside;}}}policy-options {policy-statement vpn-export-policy {then {community add community-name;accept;}}policy-statement vpn-import-policy {term term-name {from community community-name;then accept;}}community community-name members target:100:20;}routing-instances {vrf {instance-type vrf;interface sp-3/1/0.1; # Inside sp interface.interface so-0/0/0.0; # Interface that connects to the CE router.route-distinguisher route-distinguisher;vrf-import vpn-import-policy;vrf-export vpn-export-policy;routing-options {static {route ip-address/prefix next-hop so-0/0/0.0; # Routes for the CE router.route ip-address/prefix next-hop sp-3/1/0.1; # Routes for IPSec.}}}}services {service-set service-set-name {next-hop-service {inside-service-interface sp-3/1/0.1;outside-service-interface sp-3/1/0.2;}ipsec-vpn-options {local-gateway;}ipsec-vpn-rules rule-name;}ipsec-vpn {rule rule-name {term term-name {from {source-address {source-ip-address;}}then {remote-gateway;dynamic {ike-policy ike-policy-name;}}}match-direction direction;}ike {policy ike-policy-name {pre-shared-key ascii-text preshared-key;}}}}

For more information on VRF routing instances, see the JUNOS VPNs Configuration Guide. For more information on next-hop service sets, see the JUNOS Services Interfaces Configuration Guide.

Published: 2010-04-15

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