Juniper BGP - CONFIGURATION GUIDE V 11.1.X Configuration Manual page 475

You can use the ip mpls forwarding-mode label-switched command to configure
the router to generate a label for each different FEC that a BGP route points to in the
VPN; this is a per-FEC label. Issuing this command enables you to avoid a route
lookup for traffic destined for CE routers, because in this mode traffic is label switched
to the corresponding next hop over that interface; a route lookup is not performed.
The route for which a label is allocated can be an ECMP route; in that case, the
label-switched traffic uses ECMP.
For the following types of routes, the router always generates a per-VRF label and
forwards traffic after a route lookup (rather than label switching the traffic without
a route lookup) regardless of the status of this command:
The following commands configure a router where BGP is running in VRF pe11 and
static and connected routes are redistributed into the VRF:
For each connected route that is redistributed into the VRF and advertised across
the BGP/MPLS VPN, the router assigns a per-VRF label rather than a per-FEC label.
The static route 10.1.1.1/32 points to loopback interface 1. BGP therefore advertises
this static route with a per-VRF label.
ip mpls forwarding-mode label-switched
Local connected interfaces redistributed into BGP, regardless of the interface
type.
BGP redistributed routes that point to loopback interfaces.
host1(config)#ip vrf pe11
host1(config-vrf)#ip mpls forwarding-mode label-switched
host1(config-vrf)#ip route vrf pe11 10.3.4.5 255.255.255.255 fastEthernet 0/1
host1(config-vrf)#ip route vrf pe11 10.1.1.1 255.255.255.255 loopback 1
host1(config-vrf)#exit
host1(config)#router bgp 100
host1(config-router)#address-family ipv4 unicast vrf pe11
host1(config-router-af)#exit
host1(config-router)#no auto-summary
host1(config-router)#no synchronization
host1(config-router)#redistribute static
host1(config-router)#redistribute connected
Use to generate a label for each different FEC pointed to by a BGP route.
For some types of routes, issuing this command has no effect on the labels
created; they are always per-VRF labels.
Example
host1:vr1(config-vrf)#ip mpls forwarding-mode label-switched
Use the no version to restore the default, generating a single label for all BGP
routes sent from a given VRF.
See ip mpls forwarding-mode label-switched.
Chapter 5: Configuring BGP-MPLS Applications
Configuring BGP VPN Services
439