804
Configuring L2 Multicast Features
desirable as it reduces the network load by sending packets only to other
hosts/switches/routers that have indicated an interest in receiving the
multicast.
If L2 snooping is not enabled, multicast packets are flooded in the ingress
VLAN.
What Are the Multicast Bridging Features?
The Dell Networking series switches support multicast forwarding and
multicast flooding. For multicast traffic, the switch uses a database called the
Layer 2 Multicast Forwarding Database (MFDB) to make forwarding
decisions for packets that arrive with a multicast destination MAC address. By
limiting multicasts to only certain ports in the switch, traffic is prevented
from going to parts of the network where that traffic is unnecessary.
When a packet enters the switch, the destination MAC address is combined
with the VLAN ID, and a search is performed in the Layer 2 MFDB. If no
match is found, then the packet is flooded. If a match is found, then the
packet is forwarded only to the ports that are members of that multicast
group within the VLAN.
Multicast traffic destined to well-known (reserved) multicast IP addresses
(control plane traffic) is always flooded to all ports in the VLAN. The well-
known IP multicast addresses are 224.0.0.x for IPv4 and FF0x:: for IPv6.
Multicast data traffic is flooded to all ports in the VLAN if no multicast
router ports have been identified. Once a multicast router port is identified,
multicast data traffic is forwarded to the multicast router ports. The MFDB is
populated by snooping the membership reports sent to the multicast routers.
This causes multicast data traffic to be forwarded to any hosts joining the
multicast group.
What Is L2 Multicast Traffic?
L3 IP multicast traffic is traffic that is destined to a host group. Host groups
are identified by class D IPv4 addresses, which range from 224.0.1.0 to
239.255.255.255, or by FF0x:: or FF3x:: IPv6 addresses. In contrast to L3
multicast traffic, L2 multicast traffic is identified by the MAC address, i.e.,
the range 01:00:5e:00:00:00 to 01:00:5e:7f:ff:ff:ff for IPv4 multicast traffic or
33:33:xx:xx:xx:xx for IPv6 multicast traffic.
Summary of Contents for N2000 Series
Page 50: ...50 Contents ...
Page 54: ...54 Introduction ...
Page 134: ...134 Using Dell OpenManage Switch Administrator ...
Page 168: ...168 Setting Basic Network Information ...
Page 206: ...206 Managing a Switch Stack ...
Page 242: ...242 Configuring Authentication Authorization and Accounting ...
Page 318: ...318 Managing General System Settings Figure 12 24 Verify MOTD ...
Page 322: ...322 Managing General System Settings ...
Page 358: ...358 Configuring SNMP ...
Page 388: ...388 Managing Images and Files ...
Page 415: ...Monitoring Switch Traffic 415 Figure 16 2 sFlow Agent Summary ...
Page 451: ...Monitoring Switch Traffic 451 5 On the Capture Options dialog click Manage Interfaces ...
Page 458: ...458 Monitoring Switch Traffic ...
Page 488: ...488 Configuring Port Characteristics Figure 18 3 Copy Port Settings 8 Click Apply ...
Page 502: ...502 Configuring Port Characteristics ...
Page 567: ...Configuring Port and System Security 567 Figure 19 38 Captive Portal Client Status ...
Page 674: ...674 Configuring VLANs Figure 21 17 GVRP Port Parameters Table ...
Page 680: ...680 Configuring VLANs Figure 21 24 Double VLAN Port Parameter Table ...
Page 714: ...714 Configuring VLANs ...
Page 737: ...Configuring the Spanning Tree Protocol 737 Figure 22 9 Spanning Tree Global Settings ...
Page 760: ...760 Configuring the Spanning Tree Protocol ...
Page 786: ...786 Discovering Network Devices ...
Page 793: ...Configuring Port Based Traffic Control 793 Figure 24 3 Storm Control 5 Click Apply ...
Page 878: ...878 Configuring Connectivity Fault Management ...
Page 899: ...Snooping and Inspecting Traffic 899 Figure 27 17 DAI Interface Configuration Summary ...
Page 903: ...Snooping and Inspecting Traffic 903 Figure 27 24 Dynamic ARP Inspection Statistics ...
Page 924: ...924 Configuring Link Aggregation Figure 28 7 LAG Hash Summary ...
Page 982: ...982 Configuring Link Aggregation ...
Page 1062: ...1062 Configuring DHCP Server and Relay Settings ...
Page 1096: ...1096 Configuring L2 and L3 Relay Features Figure 34 3 DHCP Relay Interface Summary ...
Page 1200: ...1200 Configuring OSPF and OSPFv3 ...
Page 1216: ...1216 Configuring RIP ...
Page 1240: ...1240 Configuring VRRP ...
Page 1291: ...Configuring Differentiated Services 1291 Figure 40 5 DiffServ Class Criteria ...
Page 1336: ...1336 Configuring Auto VoIP ...
Page 1367: ...Managing IPv4 and IPv6 Multicast 1367 Figure 43 20 IGMP Cache Information ...
Page 1422: ...1422 Managing IPv4 and IPv6 Multicast ...
Page 1440: ...1440 System Process Definitions ...
Page 1460: ...Index 1460 ...