Cisco Cisco IOS Software Release 12.2(27)SBC

The NetFlow MPLS Label Export feature requires the following:

NetFlow configured on the LSR

MPLS enabled on the LSR

If you are exporting data to a Cisco NetFlow collector, the following requirements apply:

NetFlow Version 9 export format configured on the LSR

NetFlow collector and analyzer that can use MPLS PAL records exported in NetFlow Version 9 
format

The following restrictions apply to the NetFlow MPLS Label Export feature for Cisco IOS 12.2S 
releases:

The MPLS PAL table does not support the export of information for the following:

IP Version 6 (IPv6) labels

IP Multicast labels

Quality of service (QoS) labels

Traffic engineering (TE) tunnel headend labels

The ability to create a VRF-to-VRF traffic matrix is not supported.

If one application deallocates a label and a second application soon reallocates the same label, the 
NetFlow collector might not be able to determine how many packets flowed while the label was 
owned by each application.

In MPLS PAL table records, for labels allocated by VPNs, Border Gateway Protocol (BGP) IPv4, 
or BGP VPN Version 4 (VPNv4), the stored prefix can be either 0.0.0.0 or a route distinguisher 
(RD)-specific address: 

If you do not configure the mpls export vpnv4 prefixes command, VPN prefixes are not tracked 
in the MPLS PAL table. These prefixes are displayed by the show mpls flow mappings 
command as 0.0.0.0.

If you configure the mpls export vpnv4 prefixes command, VPN prefixes are tracked and 
RD-specific addresses are displayed by the show mpls flow mappings command.