Igmp Snooping | Juniper Networks EX2500 manual

Chapter 7

IGMP

Internet Group Management Protocol (IGMP) is used by IP Multicast routers to learn about the existence of host group members on their directly attached subnet (see RFC 2236). The IP Multicast routers get this information by broadcasting IGMP Membership Queries and listening for IP hosts reporting their host group memberships. This process is used to set up a client/server relationship between an IP Multicast source that provides the data streams and the clients that want to receive the data.

The EX2500 switch can perform IGMP Snooping, and connect to static multicast routers (Mrouters).

The following topics are discussed in this chapter:

IGMP Snooping on page 71

FastLeave on page 72

IGMPv3 Snooping on page 73

IGMP Snooping Configuration Example on page 73

Static Multicast Router on page 74

IGMP Snooping

IGMP snooping allows the switch to forward multicast traffic to only those ports that request it. IGMP Snooping prevents multicast traffic from being flooded to all ports. The switch learns which server hosts are interested in receiving multicast traffic, and forwards it only to ports connected to those servers.

IGMP snooping conserves bandwidth. With IGMP Snooping, the switch learns which ports are interested in receiving multicast data, and forwards multicast data to those ports only. In this way, other ports are not burdened with unwanted multicast traffic.

The switch can sense IGMP Membership Reports from attached clients and can act as a proxy to set up a dedicated path between the requesting host and a local IP Multicast router. After the pathway is established, the switch blocks the IP Multicast stream from flowing through any port that does not connect to a host member, thus conserving bandwidth.

IGMP Snooping 71

Image 85

Juniper Networks EX2500 manual Igmp Snooping

Contents

North Mathilda Avenue Sunnyvale, CA Configuration Guide Ii „ Table of Contents Chapter VLANs Rmon Overview Rmon Group 1-Statistics Rmon Group 2-History Chapter Ports and Trunking Appendixes Port Mirroring Overview Configuring Port MirroringIndexes Port-Based Vlan Assignment Default Vlan SettingsPage List of Tables EX2500 Ethernet Switch Configuration Guide „ List of Tables Objectives About This GuideAudience Supported Platforms Icon Meaning Description Documentation Conventions Documentation Feedback List of Technical PublicationsRequesting Technical Support Opening a Case with Jtac Self-Help Online Tools and Resources EX2500 Ethernet Switch Applications Page Configuring the Management Interface Accessing the Switch Configure the default gateway. Enable the gateway Dynamic Host Configuration Protocol Using the EX2500 Web Device Manager Using Telnet Configuring EX2500 Web Device Manager Access via Https Configuring EX2500 Web Device Manager Access via Http SNMPv1, SNMPv2 Using Snmp User Configuration Default ConfigurationSNMPv3 SNMPv1 Trap Host Configuration Configuring Snmp Trap HostsSNMPv2 Trap Host Configuration Configure an entry in the notify table SNMPv3 Trap Host Configuration Securing Access to the Switch How Radius Authentication Works Radius Authentication and AuthorizationConfiguring Radius on the Switch Configure the Radius secret Radius Authentication Features in the EX2500 Switch Radius Attributes for EX2500 User Privileges Switch User Accounts How TACACS+ Authentication Works TACACS+ AuthenticationTACACS+ Authentication Features in the EX2500 Switch „ starttime „ stoptime „ elapsedtime „ disccause Configuring TACACS+ Authentication on the Switch Command Authorization and LoggingConfigure the TACACS+ secret and second secret Generating RSA Host and Server Keys for SSH Access Configuring SSH Features on the SwitchSecure Shell SSH Encryption of Management Messages SSH Integration with Radius and TACACS+ Authentication End User Access Control User Access Control Considerations for Configuring End User Accounts Logging In to an End User Account Listing Current Users Vlan Overview VLANs VLANs and Port Vlan ID Numbers „ Port configurationVlan Numbers Pvid Numbers Vlan Tagging Illustrates the default Vlan settings on the switch Default Vlan Settings Port-Based Vlan Assignment Vlan Topologies and Design Considerations Vlan Configuration Rules Multiple VLANs example in is described in Table Multiple VLANs Configuration Example Enable tagging on uplink ports that support multiple VLANs Private Vlan Ports Private VLANs Private Vlan Configuration Example Private Vlan Configuration GuidelinesConfigure a secondary Vlan and map it to the primary Vlan Verify the configuration Spanning Tree Overview Spanning Tree Protocol Determining the Path for Forwarding BPDUs Bridge Protocol Data Units BPDUsBridge Priority Changing the Spanning Tree Mode Spanning Tree Group Configuration GuidelinesPort Priority Port Path Cost Rules for Vlan Tagged Ports Creating a VlanAdding and Removing Ports from STGs Port State Changes Rapid Spanning Tree Protocol Rstp Configuration Example Rstp Configuration GuidelinesPort Type and Link Type Edge Port Why Do We Need Multiple Spanning Trees? Default Spanning Tree ConfigurationPer Vlan Rapid Spanning Tree Configuring Pvrst Pvrst Configuration Guidelines Multiple Spanning Tree Protocol Mstp Configuration GuidelinesMstp Region Common Internal Spanning Tree Implementing Multiple Spanning Tree Groups Multiple Spanning Tree Groups Configuration Example Vlan Fast Uplink Convergence Configuring Fast Uplink Convergence Configuration Guidelines Trunking Overview Ports and TrunkingStatistical Load Distribution Before Configuring Static Trunks Built-In Fault ToleranceTrunk Group Configuration Rules Port Trunk Group Configuration Example Port Trunking Configuration Example Follow these steps on the EX2500 switch Define a trunk group Link Aggregation Control Protocol Configurable Trunk Hash Algorithm„ Destination MAC Dmac „ Destination IP DIP 48 „ Link Aggregation Control Protocol Configuring Lacp Lacp Configuration GuidelinesOptionally Reducing Lacp Timeout Set the Lacp mode Ex2500config-if# lacp timeout short ex2500config-if# exit QoS Overview Quality of Service COS Using ACL Filters IP Standard ACLs MAC Extended ACLsTo delete a MAC Extended ACL To delete an IP Standard ACL To delete an IP Extended ACL IP Extended ACLs TCP/UDP Understanding ACL Priority Assigning ACLs to a Port ACL Configuration ExamplesViewing ACL Statistics ACL Example 1-Blocking Traffic to a Host Add the ACL to a port ACL Example 3-Blocking Http Traffic Assign the ACLs to a port ACL Example 4-Blocking All Except Certain Packets Configuring Storm Control Using Storm Control FiltersBroadcast Storms Differentiated Services Concepts Using Dscp Values to Provide QoS Assured Forwarding Drop Precedence Class Per Hop Behavior QoS Levels Use the following command to perform Dscp mappingDscp Mapping Shows the priority bits in a VLAN-tagged packet Using 802.1p Priority to Provide QoS Queuing and Scheduling Rmon Overview Remote Monitoring Rmon Group 1-Statistics Configure the Rmon statistics on a port Configure the Rmon History parameters for a port Configuring Rmon HistoryThis configuration enables Rmon History collection on port Rmon Group 2-History Alarm MIB Objects Rmon Group 3-AlarmsConfiguring Rmon Alarms Configure the Rmon Alarm parameters to track Icmp messages Rmon Group 9-Events Ex2500config# rmon event 110 type log-onlyPage Igmp Snooping Igmp FastLeave IGMPv3 Snooping Igmp Snooping Configuration Example Ex2500# show ip igmp groups Static Multicast Router High Availability Overview High Availability Through Uplink Failure Detection Failure Detection Pair Spanning Tree Protocol with UFD UFD Configuration Guidelines Monitoring UFD UFD Configuration ExamplePage Appendixes EX2500 Ethernet Switch Configuration Guide 80 „ Appendixes Port Mirroring Overview „ Port Mirroring Overview on „ Configuring Port Mirroring on Configuring Port Mirroring „ Index on Indexes EX2500 Ethernet Switch Configuration Guide 84 „ Indexes Numerics Index Multi-links between switches, port trunking Management interface, configuringPhysical. See switch ports Internet Group Management Protocol. See Igmp QoS Quality of Service. See QoSSecurity Segmentation. See IP subnets Segments. See IP subnets Example showing multiple VLANs Virtual Local Area Networks. See VLANs