Specifications

neighbor send-label
MP-370
Cisco IOS Multiprotocol Label Switching Command Reference
January 2010
Use this command in IPv6 address family configuration mode to bind and advertise IPv6 prefix MPLS
labels. Using this command in conjunction with the mpls ipv6 source-interface global configuration
command allows IPv6 traffic to run over an IPv4 MPLS network without any software or hardware
configuration changes in the backbone. Edge routers configured to run both IPv4 and IPv6 forward IPv6
traffic using MPLS and multiprotocol internal BGP (MP-iBGP).
Cisco IOS installs /32 routes for directly connected external BGP (eBGP) peers when the BGP session
for such a peer comes up. The /32 routes are installed only when MPLS labels are exchanged between
such peers. Directly connected eBGP peers exchange MPLS labels for:
• IP address families (IPv4 and IPv6) with the neighbor send-label command enabled for the peers
• VPN address families (VPNv4 and VPNv6)
A single BGP session can include multiple address families. If one of the families exchanges
MP
LS labels, the /32 neighbor route is installed for the connected peer.
Examples The following example shows how to enable a router in the autonomous system 65000 to send MPLS
l
abels with BGP routes to the neighbor BGP router at 192.168.0.1:
Router(config)# router bgp 65000
Router(config-router)# neighbor 192.168.0.1 remote-as 65001
Router(config-router)# neighbor 192.168.0.1 send-label
The following example shows how to enable a router in the autonomous system 65000 to bind and
advertise IPv6 prefix MPLS labels and send the labels with BGP routes to the neighbor BGP router at
192.168.99.70:
Router(config)# router bgp 65000
Router(config-router)# neighbor 192.168.99.70 remote-as 65000
Router(config-router)# address-family ipv6
Router(config-router-af)# neighbor 192.168.99.70 activate
Router(config-router-af)# neighbor 192.168.99.70 send-label
Related Commands Command Description
neighbor activate Enables the exchange of information with a neighboring router.