Virtual Private Routed Network Services
7750 SR OS Services Guide Page 877
Sampling to check if an s,g has exceeded the threshold occurs every ten seconds. If the rate has
exceeded the configured rate in that sample period then the data MDT is created. If during that
period the transmission rate has not exceeded the configured threshold then the data MDT is not
created. If the data MDT is active and the transmission rate in the last sample period has not
exceeded the configured rate then the data MDT is torn down and the multicast stream resumes
transmission over the default MDT.
Multicast Protocols Supported in the Provider Network
PIM-SM for default-mdts and PIM-SSM for data-mdts in the core network are supported by Draft
Rosen. In the customer network, both PIM-SM and PIM-SSM are supported.
Cflowd for IP-VPNs (VPRNs)
The cflowd feature allows service providers to collection IP flow data within the context of a
VPRN. This data can used to monitor types and general proportion of traffic traversing an VPRN
context. This data can also be shared with the VPN customer to see the types of traffic traversing
the VPN and use it for traffic engineering.
This should not be used for billing purposes. Existing queue counters are designed for this purpose
and provide very accurate per bit accounting records.