igmp snooping

In the previous two sections, we analyzed the IGMP snooping process based on the IGMP snooping code implemented in linux2.6.32. This section analyzes the functionality required to implement IGMP snooping based on the first two sec

Original link http://louisnetwork.blog.sohu.com/111972027.html Some tests involve IGMP snooping at work. When it comes to IGMP snooping, it is inevitable that IGMP proxy will come to mind. Sometimes, you may think more and think more about it.What is the difference between

At present, in the IP network, the operator's network to provide more services for the purpose, no longer in the form of xDSL to provide users, but directly provide a unified width interface, in some broadband community this form is particularly common. At present, in the broadband community to apply the most in addition to Internet services, more is to provide IPTV applications. In the promotion of IPTV, for the involved access layer switching equipment, the device is generally required to supp

Original link http://blog.163.com/song_jk/blog/static/235693562007022112149449/ At present, in an IP network, the carrier's network does not want to provide users in the form of xDSL for the purpose of providing more services, but directly provides a uniform width interface, this form is particularly common in some broadband communities. Currently, in addition to Internet services, most applications in broadband communities are provided with IPTV. In the promotion of IPTV, it is generally requi

can quickly find its associated multicast group database entries U32 queries_sent;//the number of times a query package has been sent }; Where the port list is used to add all the corresponding bridges to the addr of the multicast group Next points to the next multicast port, and the next multicast group address is addr, only the port value is different. Where mglist is used to add the multicast port to the Mglist linked list of port, through the mglist linked list of the bridge port, can find

PIM SM + IGMP snooping suitability test test topology Figure 1 BootstrapThe BOOTSTRAP protocol is used to designate and announce the RP, the BOOTSTRAP protocol ensures that the entire network chooses a unique BSR (boot router) through Bootstrap messages, BSR collects the RP information in the network and floods all PIM routers in the PIM domain; C-RP learned about BSR, By sending candidate-rp-ad

PIM SM + IGMP snooping suitability Test (ii) Introduction to TTL issuesThe two questions and answers in the previous section are based on theoretical analysis and experimental validation, and this section describes the problems encountered in experiments and experiments.Test topology Figure 1 Experiment DescriptionBefore doing experiments to verify the technical problems, first of all to clarify

Take a look at the diagram below, L2 switch turns on IGMP snooping,router1 is a remote multicast router that forwards multicast packets with the PIM protocol. PIM, Protocol-Independent Multicast is a family of multicast routing protocols that can provide one-to-many and many-to-many distribution of data over the Internet. The "protocol-independent" part refers to the fact that PIM does n

multicast IP address, you can convert its MAC address, do not need to obtain the MAC address through ARP request. In the specific implementation of the function, but also divided into IGMP snooping and IGMP proxy two kinds. For IGMP snooping This is a function of implemen

Internet Group Management Protocol (IGMP), which allows all systems on a physical network to know the multicast group in which the host is currently located. Multicast routers need this information to know which ports multicast data packets should be forwarded. IGMP is defined in RFC 1112. IGMP has a fixed message length and no data is available. The protocol f

Tags: IP source GuardNetwork topology structure:Scenario Description:Core layer: Each VLAN interface gateway is at the core layerAggregation layer: Two stacks, port-channel to the core layer, Port-channel Xia Lian to the access layer, do not run dynamic routingAccess layer: Two port Port-channel, link to two aggregation switches respectivelyObjective:Prevent internal enterprise network from accessing DHCP server through DHCP snooping;Prevent internal

MulticastTransmission: Implements point-to-point network connection between the sender and each receiver. If a sender transmits the same data to multiple recipients at the same time, only one copy of the same data packet is required. It improves data transmission efficiency. This reduces the possibility of network congestion. IGMP V2 package: The following three types of packages are supported: query, report, and Leave. The purpose of adding a Leave p

ICMP and IGMP protocols are the basic protocols in the tcp ip protocol stack. Therefore, message control is the main task of ICMP. For IGMP, the main task is to pass the information to the router. Let's take a look at the specific explanations of the two protocols below. Internet Control Message Protocol ICMP is used to report errors and control messages on behalf of IP addresses. The IP address uses the

For those who work on networking, the dhcp snooping guy is certainly familiar to everyone. Here we will explain and explain this knowledge point. Here we will mainly explain the network topology. I. Network Topology Ii. Description 1. Topology Description: The aggregation layer switch is ipvst4506, the core switch is ipvst6506, And the access layer switch is ipvst2918. 4506 enable ip dhcp snooping, DAI, an

sent into packets separately, and ICMP messages are sent only when the datagram offset is 0. ICMP messages are sent in the basic IP header. The following is the ICMP encapsulation. Type: 1 byte, indicating the type of the ICMP frame. ICMP information is both an error message and a query message. Code: 1 byte, indicating the error code of this type. Only error reports are available, and all others are 0. Checksum: The length is 2 bytes, indicating the 16-bit checksum of the entire ICMP fram

Original link http://f0g.is-programmer.com/posts/5458.html These two days have been overwhelmed by IGMP proxy, sometimes working, sometimes not working. Finally, I am very worried aboutCodeI finally found the problem and summarized it. The principle of IGMP proxy is to receive IGMP Report on the downstream interface, and then broadcast it from the upstream

In the previous article, we explained what DHCP Snooping is. So we have a general understanding of this through the content of the article. Next, we will take a look at the specific operations and steps of DHCP Snooping configuration. The DHCP Snooping function and the DHCP Option 82 function of 1x are mutually exclusive. DHCP

MulticastUnlike the one-to-one transmission over the network, it is a one-to-many (at least one) point based on UDP/IP point transmission protocol, The multicast router uses the IGMP protocol to check whether the multicast group receiver exists in the network segment connected to each interface, that is, the group members. If a member exists, the multicast router should forward the multicast packet to This CIDR block. If no member exists, stop forward

Document directory Group Management IGMP operation Encapsulation Internet Group Management Protocol (IGMP) is an auxiliary protocol for IP multicast. So what is multicast? "Multicast" is also called "multi-point transmission" (Multicast). A package sent by a host can be received by multiple other qualified hosts at the same time, this host and those qualified hosts form a group, and their communicati

This time, we will summarize the UDP and IGMP in the IP layer. UDP is a simple datagram-oriented transport layer protocol that provides unreliable services: It adds the application data to the UDP header and then sends it to the IP layer, but they cannot be guaranteed to reach their destination. The application must be concerned with the length of the IP datagram. If it exceeds the MTU of the network, it must partition the IP datagram. If necessary, e