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Dell PowerConnect M6220 User's Guide - Page 362

IGMP Snooping, Forwarding Mode, Forward Unregistered, Forward All, Bridge Multicast Forward, VLAN ID

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• Forwarding Mode - Specifies the multicast forwarding mode for the selected VLAN. Possible values are: - Forward Unregistered - Permits the forwarding of IPv4 multicast packets with a destination address that does not match any of the groups announced in earlier IGMP Membership Reports. - Forward All - Permits registered and unregistered multicast packets to forward. - Filter Unregistered - Prohibits the forwarding of IPv4 multicast packets with a destination address that does not match any of the groups announced in earlier IGMP Membership Reports. Changing the Bridge Multicast Forwarding Mode. 1. Open the Bridge Multicast Forward page. 2. Select the VLAN ID from the drop-down menu. 3. Select the Forwarding Mode to assign the VLAN from the drop-down menu. 4. Click Apply Changes. The VLAN is updated with the Forwarding Mode setting, and the device is updated. Managing LAGs and Ports Attached to Multicast Routers Using CLI Commands For information about the CLI commands that perform this function, see the following chapter in the CLI Reference Guide: • Address Table Commands IGMP Snooping Internet Group Management Protocol (IGMP) Snooping is a feature that allows a switch to forward multicast traffic intelligently on the switch. Multicast IP traffic is traffic that is destined to a host group. Host groups are identified by class D IP addresses, which range from 224.0.0.0 to 239.255.255.255. Based on the IGMP query and report messages, the switch forwards traffic only to the ports that request the multicast traffic. This prevents the switch from broadcasting the traffic to all ports and possibly affecting network performance. When a packet with a broadcast or multicast destination address is received, the switch will forward a copy into each of the remaining network segments in accordance with the IEEE MAC Bridge standard. Eventually, the packet is made accessible to all nodes connected to the network. This approach works well for broadcast packets that are intended to be seen or processed by all connected nodes. In the case of multicast packets, however, this approach could lead to less efficient use of network bandwidth, particularly when the packet is intended for only a small number of nodes. Packets will be flooded into network segments where no node has any interest in receiving the packet. Allowing switches to snoop IGMP packets is a creative effort to solve this problem. The switch uses the information in the IGMP packets as they are being forwarded throughout the network to determine which segments should receive packets directed to the group address. 360 Configuring Switching Information

Section	Page
User’s Guide	1
Introduction	17
Switching Features	20
Port-Based Features	22
Spanning Tree Protocol Features	25
IPv6	30
OSPFv3	31
Quality of Service Features	31
Multicast Features	32
CLI Documentation	34
Using Dell™ OpenManage™ Switch Administrator	35
Understanding the Interface	37
Check Boxes	43
Defining Fields	43
Accessing the Switch Through the CLI	43
Console Connection	44
Using the CLI	44
Cable and Port Information	47
Overview	47
Power Connection	50
Hardware Description	51
Overview	51
PowerConnect Front Panel	52
Console (RS-232) Port	55
Configuring Dell™ PowerConnect™	65
Overview	65
Starting the CLI	66
General Configuration Information	68
Baud Rate	68
Booting the Switch	69
Configuration Overview	75
Advanced Configuration	80
Boot Menu Functions	89
Delete Backup Image	93
Activate Backup Image	94
Sample Configuration Process	95
Switch Setup Requirements	95
Configuring System Information	105
Overview	105
Managing Logs	124
Setting the Operational Mode	132
Defining IP Addressing	134
Out of Band Interface	135
Running Cable Diagnostics	145
Managing Device Security	149
Captive Portal	188
Defining SNMP Parameters	209
File Management	231
Defining Advanced Settings	238
Defining Stacking	240
sFlow	247
Industry Standard Discovery Protocol	255
Configuring Switching Information	261
Overview	261
Configuring Ports	287
Configuring Traffic Mirroring	298
Configuring Address Tables	302
Configuring GARP	307
Configuring the Spanning Tree Protocol	310
Configuring VLANs	324
Configuring Voice VLAN	347
Aggregating Ports	349
Managing Multicast Support	355
IGMP Snooping	362
MRouter Status	371
MLD Snooping	372
Configuring the Link Layer Discovery Protocol (LLDP)	379
Creating Link Dependencies	386
Dynamic ARP Inspection	389
DHCP Snooping	397
DHCP Relay	410
Using the Port Aggregator Feature	416
Viewing Statistics and Remote Monitoring	423
Overview	423
Table Views	424
RMON	433
Charts	448
Configuring Routing	453
Overview	453
IP	458
OSPF	465
BOOTP/DHCP Relay Agent	499
IP Helper	502
RIP	509
Router Discovery	520
Router	523
VLAN Routing	533
VRRP	536
Tunnels	546
Loopbacks	551
Configuring IPv6	559
Overview	559
Global Configuration	560
Interface Configuration	561
Interface Summary	564
IPv6 Statistics	565
IPv6 Neighbor Table	570
DHCPv6	571
OSPFv3	586
IPv6 Routes	616
Configuring Quality of Service	623
Quality of Service Overview	623
Configuring Differentiated Services	624
Class of Service	641
Auto VoIP	650
Configuring IP Multicast	653
Overview	653
Multicast Listener Discovery	666
Distance Vector Multicast Routing Protocol	679
Internet Group Management Protocol	688
Protocol Independent Multicast-Dense Mode	703
Protocol Independent Multicast-Sparse Mode	716
Getting Help	731
Dell Enterprise Training and Certification	733
Problems With Your Order	733
Product Information	734
Returning Items for Warranty Repair or Credit	734
Before You Call	734

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360

Configuring Switching Information

•

Forwarding Mode

— Specifies the multicast forwarding mode for the selected VLAN. Possible values

are:

–

Forward Unregistered

— Permits the forwarding of IPv4 multicast packets with a destination

address that does not match any of the groups announced in earlier IGMP Membership Reports.

–

Forward All

— Permits registered and unregistered multicast packets to forward.

–

Filter Unregistered

— Prohibits the forwarding of IPv4 multicast packets with a destination

address that does not match any of the groups announced in earlier IGMP Membership Reports.

Changing the Bridge Multicast Forwarding Mode.

Open the

Bridge Multicast Forward

page.

Select the

VLAN ID

from the drop-down menu.

Select the

Forwarding Mode

to assign the VLAN from the drop-down menu.

Click

Apply Changes

The VLAN is updated with the

Forwarding Mode

setting, and the device is updated.

Managing LAGs and Ports Attached to Multicast Routers Using CLI Commands

For information about the CLI commands that perform this function, see the following chapter in the

CLI Reference Guide

•

Address Table Commands

IGMP Snooping

Internet Group Management Protocol (IGMP) Snooping is a feature that allows a switch to forward

multicast traffic intelligently on the switch. Multicast IP traffic is traffic that is destined to a host group.

Host groups are identified by class D IP addresses, which range from 224.0.0.0 to 239.255.255.255. Based

on the IGMP query and report messages, the switch forwards traffic only to the ports that request the

multicast traffic. This prevents the switch from broadcasting the traffic to all ports and possibly affecting

network performance.

When a packet with a broadcast or multicast destination address is received, the switch will forward a

copy into each of the remaining network segments in accordance with the IEEE MAC Bridge standard.

Eventually, the packet is made accessible to all nodes connected to the network.

This approach works well for broadcast packets that are intended to be seen or processed by all connected

nodes. In the case of multicast packets, however, this approach could lead to less efficient use of network

bandwidth, particularly when the packet is intended for only a small number of nodes. Packets will be

flooded into network segments where no node has any interest in receiving the packet.

Allowing switches to snoop IGMP packets is a creative effort to solve this problem. The switch uses the

information in the IGMP packets as they are being forwarded throughout the network to determine

which segments should receive packets directed to the group address.