All things related to multicast

[Tim Chown <>]

Hi,

We're using nsfen as our Netflow collector, and sending flow data from
a Cisco 6509 (dual-stack, but just sending IPv4 data) and a 7206 (IPv6
only router, so just IPv6 flows).

Everything's fine for IPv4 and IPv6 unicast, and IPv6 multicast, except 
that we're missing IPv4 multicast flow data from the 6509.

It appears that the 6509 is holding the flow data, e.g. if you query the
data with

show ip cache verbose flow

the returned results include multicast flow data e.g.

 SrcIf            SrcIPaddress          DstIPaddress      Pr       SrcP      
DstP      Pkts

 Vl10             152.78.nn.nn          224.2.127.254     udp      9875      
9875      117
 Vl29             152.78.nn.nn         239.255.255.250   udp      55428     
1900      5   
 Vl10             152.78.nn.nn          233.3.18.5        udp      1024      
30185     2849

but querying nfsen for records matching either by specific IP or by
multicast network blocks returns no matches.

The 6509 is running 12.2(18)SXF9.

The related config is:

ip multicast-routing 
ipv6 multicast-routing
mls ip multicast flow-stat-timer 9
mls flow ip full
no mls flow ipv6

ip flow-export destination nn.nn.nn.nn nnnn

Is there some extra config required?  The examples we see online are for
ingress or egress multicast flow gathering on a per-interface basis,
but the above config is global to the router (all interfaces)?

Suggestions welcome!

-- 
Tim