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Configuration Guide - IP Multicast

S7700 and S9700 V200R013C00

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, IPv4 PIM, IPv6 PIM, MSDP, multicast VPN, layer 3 multicast CAC, IPv4 multicast route management, IPv6 multicast route management, IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN replication, layer 2 multicast CAC, multicast network management.
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Multicast NSR

Multicast NSR

Non-Stop Routing (NSR) is a feature used to implement master/slave switchover on the control plane. Through multicast NSR, the protocol control plane can back up protocol control information, including neighbor information, MDT information, RP set information. Multicast NSR also finishes information synchronization between the protocol control plane and the forwarding control planes, and between the forwarding control plane of the MPU and the forwarding control plane of the LPU.

Through multicast NSR, the adjacent devices cannot sense the master/slave switchover of the current device. Therefore, multicast routing is not interrupted and the MDT is not changed, which will not trigger the processing on the adjacent devices.

Multicast NSR not only ensures non-stop service forwarding but also enables the device to process Join and Leave message in time. In addition, multicast NSR is also applicable to the scenario where the topology changes after a master/slave switchover. It fast responds to the change of the topology and avoids packet loss. Compared with Graceful Restart (GR), NSR has a great improvement.

Currently, multicast NSR is applicable to the following protocols:
  • Internet Group Management Protocol (IGMP)
  • Multicast Listener Discovery (MLD)
  • Protocol Independent Multicast - Sparse Mode (PIM-SM)
  • Protocol Independent Multicast-Source-Specific Multicast (PIM-SSM)
  • Multicast Source Discovery Protocol (MSDP)
  • Multicast Virtual Private Network (MVPN)
  • IPv6 PIM-SM
  • IPv6 PIM-SSM

Multicast NSR is not applicable to Protocol Independent Multicast - Dense Mode (PIM-DM).

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Updated: 2019-04-08

Document ID: EDOC1100065742

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