Why must unicast routes be reachable before multicast services are configured


Multicast devices do not maintain unicast routing information independently on the network. The devices must perform the RPF check on the received packets according to the unicast routing information on the network before creating PIM routing entries. If there is no unicast route to a specific destination, the RPF check fails.

Other related questions:
Which unicast routing protocols and multicast protocols does GRE support
Generic routing encapsulation (GRE) supports the following unicast routing protocols: -Static routing protocols -OSPF -ISIS -RIP -BGP GRE supports protocol independent multicast (PIM), a multicast protocol.

What are differences between the multicast and unicast transmission modes for S series switches
Differences between the multicast and unicast transmission modes - In unicast transmission mode, a source sends an independent data packet to each host that requires data. In this mode, the amount of data transmitted on a network is proportional to the number of users who require the data. If a large number of users require the same data, the source must send many copies of the data to these users, consuming high bandwidth on the source and network. - Multicast is a point-to-multipoint (P2MP) data transmission mode. The source sends only one copy of data, and all the hosts that require the data can receive the same data. Other hosts on the network cannot receive the data. In multicast mode, data starts to be copied and distributed on the network node as far from the source as possible. Therefore, the amount of data and network resource consumption will not increase greatly when the number of receivers increases. Disadvantages of multicast transmission - Compared with the unicast mode, the multicast mode has no error correction mechanism, but some fault tolerance mechanisms can be adopted. - Although multicast transmission is supported by existing networks, features such as customer authentication and QoS are not well supported.

Must unicast routes be reachable when the multicast function is configured on an S series switch
Protocol independent multicast (PIM) uses routes in the unicast routing table. Therefore, PIM depends on a unicast routing protocol and can work only when unicast routes are reachable.

Should I Stop the ECS Before Creating a Private Image Using that ECS?

You must stop the ECS when creating a private image using that ECS. If the ECS is running, the ECS memory may buffer data to be read, which may result in data loss in the created image. To prevent this issue, stop the ECS before creating an image.

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