multicast troubleshooting

1, the problem description: We have a CPE MP1803 router as a customer's CE router, the PC after the IGMP report, our router will be in the IGMP table to write the multicast group, but the customer said that the upstream of the PE device does not receive the PIM of our equipment Join message and ultimately cannot draw the multicast traffic down. After the investigation, found that customers in the same loc

Command r1 # sh ip pim ap r1 # sh ip pim rp r1 # sh ip pim rp cannot see RPr1 # sh IP mroute ip Multicast Routing Table Flags: D-Dense, s-Sparse, B-Bidir Group, s-SSM Group, C-Connected, L-Local, P-Pruned, R-RP-bit set, F-Register flag, t-SPT-bit set, J-Join SPT, M-MSDP created entry, X-Proxy Join Timer Running, A-Candidate for MSDP Advertisement, U-URD, i-Received Source Specific Ho St Report, Z-Multicast

The chapter is quite low, but very important!Everything around us is almost dependent on abstracting things down to a lower level and at some point detailing them in some design concepts. The interface layer is clear and the target is very focused, the application does not consider how the operating system works, the operating system does not have to consider how the hardware works, the 4th layer of the OSI model does not need to consider how the third layer works. So we just need to focus on a

First, the basic introduction of multicastMulticast refers to the way that a sending source sends a single IP packet over the network to a specific set of recipients. Multicast combined with the advantages of unicast and broadcast, in the point-to-multipoint transmission, the sending source does not need to care about the number of recipients, only send a message, the router is only concerned about the interface under the recipient, also do not need t

Reprint http://blog.sina.com.cn/s/blog_4fc7368a0100okbq.html 1, multicast and broadcast need to be in the LAN to achieve, and also to see whether the Linux system support multicast and broadcast: Ifconfig up broadcast multicast mtu:1500 metric: 1Explains that the NIC supports2, send multicast packet host need to set t

1. What is multicast 1. What is multicast? Multicast is a data packet transmission method. When multiple hosts become the receiver of a data packet at the same time, multicast becomes the best choice for bandwidth and CPU load. Www.2cto.com 2. How does multicast work?

What is multicast Unicast is used for end-to-end communication between two hosts, which is used for data communication of a host on all hosts on the local network. Unicast and broadcast are two extremes, either communicating to a single host or communicating to a host on the entire LAN. In practice, it is often necessary to communicate with a specific set of hosts, rather than all hosts on the entire LAN, which is the purpose of multicasting.

Why to use multicast: The network card receives the target physical address from the net the corresponding all bit bit bits all 1 data timekeeping, will receive this message and passes it to the driver, this network card's working mode is called the broadcast mode, the network card's default working mode contains the direct mode and the broadcast mode. With this feature, the UDP (User Datagram Protocol) also provides the ability to send broadcast pack

Multicast (multicast) transfer:A point-to-multipoint network connection is implemented between the sender and each receiver. If a sender transmits the same data to multiple receivers at the same time, only one copy of the same packet is copied. It improves the efficiency of data transfer. Reduces the likelihood of congestion in the backbone network. The differences between unicast,

H3CSE: detailed explanation of multicast forwarding mechanism and h3cse multicast forwarding Different from unicast, the multicast data forwarding path is based on the tree structure. Different from unicast, multicast forwarding needs to check whether the inbound interface of the packet is optimal. All

The three terms unicast "(Unicast)," Multicast "(multicast), and" broadcast "(broadcast) are terms used to describe how network nodes communicate with each other. So what do these terms mean? What's the difference? 1. Unicast: Communication between network nodes is like a conversation between people. If a person speaks to another person, the term "unicast" is described in terms of network technology, when t

The three terms unicast, multicast, and broadcast unicast (Unicast), multicast (multicast), and broadcast (broadcast) are terms used to describe how network nodes communicate with each other. So what do these terms mean? What's the difference?1. Unicast:Communication between network nodes is like a conversation between people. If a person speaks to another person

Links: https://www.zhihu.com/question/36730567/answer/83083851Source: KnowCopyright belongs to the author. Commercial reprint please contact the author for authorization, non-commercial reprint please specify the source.Multicast IP conversion to a multicast MAC address is a 32:1 mapping relationship.Multicast IP Address:The IANA assigns the class D address space to the IP multicast address. The address of

224.0.0.0 to 239.255.255.255 these are called multicast addresses.Let me give you a less rigorous example.There are several hosts that have joined the 224.1.1.1 group.192.168.1.1---192.168.1.2---192.168.1.3---such as these three IP addresses joined the group 224.1.1.1Then the multicast source 10.1.1.1---Send information to 224.1.1.1 this group address, the group of the host will receive the

IP multicast traffic requires a special multicast address, the IP multicast address is a group of class D IP addresses ranging from 224.0.0.0 to 239.255.255.255. Many of these addresses are reserved for special purposes. 224.0.0.0 to 224.0.0.255 's address is best not to use because they are mostly kept for special purposes (such as the IGMP protocol).IGMP is the

The terms unicast, multicast, and broadcast are used to describe the communication methods between network nodes. So what exactly do these terms mean? What is the difference ?. 1. unicast: communication between network nodes is like a conversation between people. If a person speaks to another person, the network technology is used to describe "unicast". At this time, information is received and transmitted only between two nodes. Unicast has been wide

Introduction IP multicast provides a method to send messages to a group of hosts. IP addresses are described in the destination address column of IP datagram. For specific formats and usage, see IP protocol. A group address is also called a Class d ip address. Its range is 224.0.0.0 to 239.255.255. This article mainly describes how to map IP multicast addresses to the corresponding MAC addresses of the rin

I. Classification of communication methodsThere are three communication modes in the current network traffic: unicast, broadcast, and multicast (multicast), where multicasting occurs at the latest, with the advantages of unicast and broadcast. Unicast: Communication between a single host and a single host Broadcast: When a host communicates with all hosts in the network

Why do Android apps use MulticastSocket to listen for multicast? Why do they connect to different routes and run on different mobile phones? Some of them cannot receive multicast messages. ---------------------------!! Reprinted please indicate the source !! ----------------------- A project that uses Wi-Fi multicast to discover devices in the LAN. However, it is

UDP MulticastImplement the server to group the client to play (send data).Implementation steps:server.c1. Create a server socket#include #include int socket (int domain, int type, int protocol); return Socket2. Building the server address structurestruct sockaddr_in serveraddr;#include Bzero (serveraddr, sizeof (SERVERADDR));serveraddr.sin_family = af_inet;SERVERADDR.SIN_ADDR.S_ADDR = htonl (Inaddr_any); IpServeraddr.sin_port = htons (server_port);// Port3. Binding Addressint bind (int sockfd, c