Administratively Scoped Ip Multicast; Bidirectional Forwarding Detection For Pim; Virtualization Support; Support For Graceful Restart Pim - Cisco Nexus 7000 Series Configuration Manual

Administratively Scoped IP Multicast

Note The next-hop-based S-G-hash algorithm ignores bidir-PIM groups.
Administratively Scoped IP Multicast
The administratively scoped IP multicast method allows you to set boundaries on the delivery of multicast
data. For more information, see RFC 2365.
You can configure an interface as a PIM boundary so that PIM messages are not sent out that interface. For
information about configuring the domain border parameter, see the Configuring PIM or PIM6 Sparse Mode.
You can use the Auto-RP scope parameter to set a time-to-live (TTL) value. For more information, see the
Configuring Shared Trees Only for ASM.

Bidirectional Forwarding Detection for PIM

Beginning with Cisco NX-OS Release 5.0(2a), Bidirectional Forwarding Detection (BFD) allows the system
to rapidly detect failures in a network. See the Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration
Guide, Release 6.x, for more information about BFD.
In PIM, a link or neighbor group failure is detected when the hold-time, which is set as part of the hello
interval, expires. However, BFD provides a more efficient method to detect a failure. This protocol establishes
a session between the two endpoints over a link and uses the forwarding engine. When BFD is enabled, the
PIM process attempts to add a BFD session as each neighbor is discovered. If a BFD session already exists,
no duplicate is created but PIM receives a callback that contains the state of the BFD session. You can enable
BFD for PIM per VRF or per interface.
PIM removes the BFD session when you disable BFD for that VRF or interface, the interface is no longer a
PIM interface, or the neighboring BFD session goes down.

Virtualization Support

A virtual device context (VDC) is a logical representation of a set of system resources. Within each VDC,
multiple virtual routing and forwarding (VRF) instances can be defined. For each VRF in a VDC in the system,
independent multicast system resources are maintained, including the MRIB and M6RIB.
You can use the PIM and PIM6 show commands with a VRF argument to provide a context for the information
displayed. The default VRF is used if no VRF argument is supplied.
For information about configuring VDCs, see the Cisco Nexus 7000 Series NX-OS Virtual Device Context
Configuration Guide.
For information about configuring VRFs, see the Cisco Nexus 7000 Series NX-OS Unicast Routing
Configuration Guide.

Support for Graceful Restart PIM

The Support for Graceful Restart protocol independent multicast (PIM) feature is a multicast High Availability
(HA) enhancement that improves the convergence of multicast-routes (mroutes) after a Route Processor (RP)
switchover. In the event of an RP switchover, the support for Graceful Restart PIM feature utilizes the
Cisco Nexus 7000 Series NX-OS Multicast Routing Configuration Guide
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Configuring PIM and PIM6