Cabletron Systems 2H22, 2M46 A.3 DETECTING MULTICAST ROUTERS

Appendix A: About IGMP

A-2 Local Management Supplement

•Supports stand alone multicast servers only if a router is present on the

network.

•Multicast forwarding rate is dependent on the number of ports to

which the multicast stream is forwarded. More ports degrade the

performance.

•Supports IGMP version 1 and 2 only. Default is version 2.

•Ports that are directly connected to routers are discovered dynamically

through snooping for routing protocols.

•IGMP is enabled or disabled per VLAN, and not per port.

•IGMP will run with GMRP, however, the IGMP does have higher

priority than GMRP.

•The switch does not act as the querier. A router is required for IGMP

on the switch to function.

•The switch will “snoop” on all incoming multicast addresses to detect

query responses, as well as queries. Query responses are sent to the

multicast address detected in the stream from the host requesting to

receive queries. The frame is an IP frame of protocol type 2. If the

frame is a response frame, IGMP will take the multicast address and

VLAN ID, and program a ﬁlter on the receive port. The response is

then forwarded out upstream ports so that the router will receive it.

Ports that receive queries are marked as upstream ports. It is assumed

a router exists somewhere off this port, and responses are sent here. If

the switch detects a router protocol on a port, that port is also marked

as a router port. This keeps the switch from blocking trafﬁc to other

routers.

A.3 DETECTING MULTICAST ROUTERS

The location of a router needs to be known in order to forward IGMP

report frames back to the router. The router(s) send multicast routing

protocol frames, which get flooded throughout the network. By snooping

on the protocols, the switch will mark ports as connected to a router. The

port is put in a “forward all” mode where all multicast frames will be

ﬂooded. This allows all types of IP multicast trafﬁc (including IGMP

streams) to go to the router.

Contents

Main Page Local Management Supplement i NOTICE ii Local Management Supplement CABLETRON SYSTEMS, INC. Local Management Supplement iii iv Local Management Supplement CABLETRON SYSTEMS SALES AND SERVICE, INC. Local Management Supplement v vi Local Management Supplement CABLETRON SYSTEMS LIMITED Local Management Supplement vii viii Local Management Supplement DECLARATION OF CONFORMITY Local Management Supplement ix CONTENTS Contents x Local Management Supplement Contents Local Management Supplement xi Page Local Management Supplement xiii FIGURES xiv Insert BookTitle TABLES CHAPTER 1 CHANGES TO LOCAL MANAGEMENT SCREENS 1.1 INTRODUCTION 1.2 ACCESSING LOCAL MANAGEMENT 1.2.1 Navigating Local Management Screens Accessing Local Management SmartTrunk User's Guide Figure 1-1 802.1D Switching Mode, LM Screen Hierarchy Local Management Supplement 1-3 Chapter 1: SmartTrunk User's Guide Figure 1-2 802.1Q Switching Mode, LM Screen Hierarchy Changes to Local Management Screens 1-4 Local Management Supplement Notes: * Refer to the 1.2.2 Screen Format 1.3 DEVICE CONFIGURATION MENU SCREEN Page 1.4 SYSTEM RESOURCES INFORMATION SCREEN 1.4.1 Resetting the Reset Peak Switch Utilization 1.5 FLASH DOWNLOAD CONFIGURATION SCREEN Page 1.5.1 Image File Download Using TFTP 1.5.2 Image File Download Using Runtime 1.5.3 Image File Download Using BootP 1.6 PORT CONFIGURATION MENU SCREEN Page 1.7 ETHERNET FULL DUPLEX CONFIGURATION Ethernet Full Duplex Conguration Screen Local Management Supplement 1-17 Figure 1-8 Ethernet Full Duplex Conguration Screen This section explains each eld of the Ethernet Full Duplex Conguration screen. PORT # (Read-only) Identies the number of the port. OPERATION MODE (Toggle) 1.7.1 Setting the Operational Mode 1.8 HIGH SPEED INTERFACE CONFIGURATION MENU Page 1.9 HIGH SPEED INTERFACE CONFIGURATION Page 1.9.1 Conguring an FE-100FX or FE-100F3 1.9.2 Setting the FE-100FX or FE-100F3 Operational Mode 1.9.3 Conguring an FE-100TX 1.9.4 Setting the FE-100TX Operational Mode 1.9.5 Setting the FE-100TX Advertised Ability 1.10 REDIRECT CONFIGURATION MENU SCREEN 1.11 PORT REDIRECT CONFIGURATION SCREEN 1-28 Local Management Supplement NOTE Only one destination port may be assigned to a source port. Figure 1-12 Port Redirect Conguration Screen The following denitions briey explain each eld of the Port Redirect Source Port (Read-Only) Shows which ports are currently set as source ports. Destination Port (Read-Only) Shows which ports are currently set as destination ports. Page 1.11.1 Changing Source and Destination Ports 1.12 VLAN REDIRECT CONFIGURATION SCREEN 1-32 Local Management Supplement The Redirect Errors function is not supported on this screen. Figure 1-13 VLAN Redirect Conguration Screen The following denitions briey explain each eld of the VLAN Redirect Source VLAN (Read-Only) Shows the VLAN ID of the VLANs that are currently set as source VLANs. Destination Port (Read-Only) Shows which ports are currently set as destination ports. Page 1.12.1 Changing Source VLAN and Destination Ports Broadcast Suppression Conguration Screen Local Management Supplement 1-35 Figure 1-14 Broadcast Suppression Conguration Screen 1.13 BROADCAST SUPPRESSION CONFIGURATION NOTE Broadcast frames received above the threshold setting are dropped. 1.13.1 Setting the Threshold 1.13.2 Resetting the Reset Peak 1.14 REPEATER CONFIGURATION MENU SCREENS 1.15 802.1 CONFIGURATION MENU SCREEN Page 1.16 SWITCH CONFIGURATION SCREEN Page 1.16.1 Setting the STA 1.16.2 Setting the Age Time Field 1.16.3 Setting (Enabling or Disabling) the Port Status 1.17 SUMMARY OF VLAN LOCAL MANAGEMENT 1.18 802.1Q VLAN CONFIGURATION MENU SCREEN 1.19 IGMP/VLAN CONFIGURATION SCREEN Page Page Page 1.19.1 Conguring VLANs for IGMP 1.20 PRIORITY/MULTICAST CONFIGURATION MENU Page 1-52 Local Management Supplement 1.21 PORT PRIORITY CONFIGURATION SCREEN Figure 1-21 Port Priority Conguration Screen NOTE The Port Priority Conguration screen does not display when the operational mode of the device is set to 802.1D SWITCHING. 1.21.1 Setting Switch Port Priority Port-by-Port 1.21.2 Setting Switch Port Priority on All Ports 1.22 ADVANCED PORT PRIORITY CONFIGURATION Advanced Port Priority Conguration Screen Local Management Supplement 1-55 Figure 1-22 Advanced Port Priority Conguration Screen The following describes each eld of the Advanced Port Priority Priority (Read-Only) Lists the eight priorities, 0 through 7. TX Queue (Toggle) To set the TX Mapping Queues, refer to Section 1.22.1. Page 1.22.1 Setting the TX Mapping Queues 1.22.2 Setting the TX Regeneration Priorities 1.22.3 Setting the Default Priority of a Port CHAPTER 2 LM SECURITY SCREENS FOR 2E43-51/2E43-51R DEVICES 2.1 REPEATER CONFIGURATION MENU SCREEN 2.2 REPEATER LEVEL SECURITY CONFIGURATION Page 2.2.1 Setting the Repeater Level Security 2.3 PORT LEVEL SECURITY CONFIGURATION Page Page 2.3.1 Setting the Port Level Security Page Page CHAPTER 3 LM SECURITY SCREENS FOR 2H23-50R/2H33-37R DEVICES 3.1 REPEATER CONFIGURATION MENU SCREEN 3.2 REPEATER PORT CONFIGURATION SCREEN Repeater Port Conguration Screen Local Management Supplement 3-3 The following are denitions for each eld of the Repeater Port PORT # (Read-only) Page 3.2.1 Setting the Port Operating Mode 3.2.2 Enabling /Disabling Repeater Ports 3.2.3 Setting Operating Mode On All Repeater Ports 3.3 MODULE LEVEL SECURITY CONFIGURATION Page 3.3.1 Setting the Module Level Security 3.4 PORT LEVEL SECURITY CONFIGURATION Port Level Security Conguration Screen Local Management Supplement 3-11 Figure 3-4 Port Level Security Conguration Screen The following section denes the elds on the Port Level Security Conguration screen. Port (Read-only) NOTE The screen will not refresh automatically. To check if the states Page 3.4.1 Setting the Port Level Security Page CHAPTER 4 GENERIC ATTRIBUTE REGISTRATION PROTOCOL (GARP) 4.1 GARP SWITCH OPERATION 4.1.1 GARP VLAN Registration Protocol (GVRP) Page 4.2 GARP MULTICAST REGISTRATION PROTOCOL (GMRP) Chapter 4: Generic Attribute Registration Protocol (GARP) 4-4 Local Management Supplement 4.3 GARP OPERATION STATUS SCREEN Figure 4-2 GARP Operation Status Screen The following describes the screen elds. Port # (Read-Only) Displays the number of the front panel interface. Page 4.3.1 Setting a Port to Operate in GMRP or GVRP 4.3.2 Setting All Ports on the Switch GMRP Conguration Screen Local Management Supplement 4-7 4.4 GMRP CONFIGURATION SCREEN Displays the number of the front panel interface. Figure 4-3 GMRP Conguration Screen The following describes the screen elds. Port # (Read-Only) 4.4.1 Setting a Mode, Port-by-Port 4.4.2 Setting a Mode for All Ports Page CHAPTER 5 NETWORK TOOLS 5.1 NETWORK TOOLS 5.1.1 Built-in Command cdp Page APPENDIX A ABOUT IGMP A.1 IGMP OVERVIEW A.2 SUPPORTED FEATURES AND FUNCTIONS A.3 DETECTING MULTICAST ROUTERS Page Page Local Management Supplement Index-1 INDEX Numerics A B C H I M N O S Index-4 Local Management Supplement T V