C
HAPTER
18
| Multicast Filtering
Layer 2 IGMP (Snooping and Query)
– 541 –
sent unsolicited periodically on all router interfaces on which multicast
forwarding is enabled. They are sent upon the occurrence of these
events:
■
Upon the expiration of a periodic (randomized) timer.
■
As a part of a router's start up procedure.
■
During the restart of a multicast forwarding interface.
■
On receipt of a Solicitation message.
◆
Multicast Router Solicitation – Devices send Solicitation messages in
order to solicit Advertisement messages from multicast routers. These
messages are used to discover multicast routers on a directly attached
link. Solicitation messages are also sent whenever a multicast
forwarding interface is initialized or re-initialized. Upon receiving a
solicitation on an interface with IP multicast forwarding and MRD
enabled, a router will respond with an Advertisement.
◆
Multicast Router Termination – These messages are sent when a router
stops IP multicast routing functions on an interface. Termination
messages are sent by multicast routers when:
■
Multicast forwarding is disabled on an interface.
■
An interface is administratively disabled.
■
The router is gracefully shut down.
Advertisement and Termination messages are sent to the All-Snoopers
multicast address. Solicitation messages are sent to the All-Routers
multicast address.
N
OTE
:
MRD messages are flooded to all ports in a VLAN where IGMP
snooping or routing has been enabled. To ensure that older switches which
do not support MRD can also learn the multicast router port, the switch
floods IGMP general query packets, which do not have a null source
address (0.0.0.0), to all ports in the attached VLAN. IGMP packets with a
null source address are only flooded to all ports in the VLAN if the system is
operating in multicast flooding mode, such as when a new VLAN or new
router port is being established, or an spanning tree topology change has
occurred. Otherwise, this kind of packet is only forwarded to known
multicast routing ports.
P
ARAMETERS
These parameters are displayed:
◆
VLAN
– ID of configured VLANs. (Range: 1-4093)
◆
IGMP Snooping Status
– When enabled, the switch will monitor
network traffic on the indicated VLAN interface to determine which
hosts want to receive multicast traffic. This is referred to as IGMP
Snooping. (Default: Disabled)
When IGMP snooping is enabled globally (see
page 532
), the per VLAN
interface settings for IGMP snooping take precedence.
Summary of Contents for ECS4810-12M Layer 2
Page 1: ...Management Guide www edge core com ECS4810 12M Layer 2 Gigabit Ethernet Switch...
Page 2: ......
Page 4: ......
Page 6: ...ABOUT THIS GUIDE 6...
Page 54: ...SECTION I Getting Started 54...
Page 64: ...CHAPTER 1 Introduction System Defaults 64...
Page 82: ...CHAPTER 2 Initial Switch Configuration Managing System Files 82...
Page 84: ...SECTION II Web Configuration 84...
Page 102: ...CHAPTER 3 Using the Web Interface Navigating the Web Browser Interface 102...
Page 206: ...CHAPTER 6 VLAN Configuration Configuring VLAN Mirroring 206...
Page 256: ...CHAPTER 11 Class of Service Layer 3 4 Priority Settings 256...
Page 378: ...CHAPTER 14 Security Measures DHCP Snooping 378...
Page 520: ...CHAPTER 16 IP Configuration Setting the Switch s IP Address IP Version 6 520...
Page 528: ...CHAPTER 17 IP Services Displaying the DNS Cache 528...
Page 586: ...CHAPTER 19 Using the Command Line Interface CLI Command Groups 586...
Page 676: ...CHAPTER 22 SNMP Commands 676...
Page 684: ...CHAPTER 23 Remote Monitoring Commands 684...
Page 816: ...CHAPTER 27 Access Control Lists ACL Information 816...
Page 866: ...CHAPTER 30 Port Mirroring Commands RSPAN Mirroring Commands 866...
Page 884: ...CHAPTER 32 Automatic Traffic Control Commands 884...
Page 890: ...CHAPTER 33 Address Table Commands 890...
Page 986: ...CHAPTER 37 Class of Service Commands Priority Commands Layer 3 and 4 986...
Page 1006: ...CHAPTER 38 Quality of Service Commands 1006...
Page 1068: ...CHAPTER 39 Multicast Filtering Commands Multicast VLAN Registration 1068...
Page 1092: ...CHAPTER 40 LLDP Commands 1092...
Page 1134: ...CHAPTER 41 CFM Commands 1134...
Page 1154: ...CHAPTER 43 Domain Name Service Commands 1154...
Page 1160: ...CHAPTER 44 DHCP Commands DHCP Client 1160...
Page 1194: ...CHAPTER 45 IP Interface Commands IPv6 Interface 1194...
Page 1196: ...SECTION IV Appendices 1196...
Page 1202: ...APPENDIX A Software Specifications Management Information Bases 1202...
Page 1224: ...COMMAND LIST 1224...
Page 1234: ...INDEX 1234...
Page 1235: ......