![background image](http://html1.mh-extra.com/html/edge-core/es3528mv2/es3528mv2_management-manual_23596221209.webp)
C
HAPTER
39
| Multicast Filtering Commands
IGMP Snooping
– 1209 –
ip igmp snooping
tcn-flood
This command enables flooding of multicast traffic if a spanning tree
topology change notification (TCN) occurs. Use the
no
form to disable
flooding.
S
YNTAX
[
no
]
ip igmp snooping tcn-flood
D
EFAULT
S
ETTING
Disabled
C
OMMAND
M
ODE
Global Configuration
C
OMMAND
U
SAGE
◆
When a spanning tree topology change occurs, the multicast
membership information learned by the switch may be out of date. For
example, a host linked to one port before the topology change (TC)
may be moved to another port after the change. To ensure that
multicast data is delivered to all receivers, by default, a switch in a
VLAN (with IGMP snooping enabled) that receives a Bridge Protocol
Data Unit (BPDU) with the TC bit set (by the root bridge) will enter into
“multicast flooding mode” for a period of time until the topology has
stabilized and the new locations of all multicast receivers are learned.
◆
If a topology change notification (TCN) is received, and all the uplink
ports are subsequently deleted, a time out mechanism is used to delete
all of the currently learned multicast channels.
◆
When a new uplink port starts up, the switch sends unsolicited reports
for all current learned channels out through the new uplink port.
◆
By default, the switch immediately enters into “multicast flooding
mode” when a spanning tree topology change occurs. In this mode,
multicast traffic will be flooded to all VLAN ports. If many ports have
subscribed to different multicast groups, flooding may cause excessive
loading on the link between the switch and the end host. Flooding may
be disabled to avoid this, causing multicast traffic to be delivered only
to those ports on which multicast group members have been learned.
◆
When the spanning tree topology changes, the root bridge sends a
proxy query to quickly re-learn the host membership/port relations for
multicast channels. The root bridge also sends an unsolicited Multicast
Router Discover (MRD) request to quickly locate the multicast routers in
this VLAN.
The proxy query and unsolicited MRD request are flooded to all VLAN
ports except for the receiving port when the switch receives such
packets.
Содержание ES3528MV2
Страница 1: ...Management Guide www edge core com ES3528MV2 ES3528MV2 DC 28 Port Fast Ethernet Layer 2 Switch...
Страница 2: ......
Страница 4: ......
Страница 48: ...CONTENTS 48...
Страница 68: ...SECTION I Getting Started 68...
Страница 78: ...CHAPTER 1 Introduction System Defaults 78...
Страница 96: ...SECTION II Web Configuration 96...
Страница 116: ...CHAPTER 3 Using the Web Interface Navigating the Web Browser Interface 116...
Страница 148: ...CHAPTER 4 Basic Management Tasks Resetting the System 148...
Страница 192: ...CHAPTER 5 Interface Configuration VLAN Trunking 192 Figure 65 Configuring VLAN Trunking...
Страница 226: ...CHAPTER 6 VLAN Configuration Configuring VLAN Translation 226...
Страница 236: ...CHAPTER 7 Address Table Settings Configuring MAC Address Mirroring 236...
Страница 270: ...CHAPTER 9 Congestion Control Automatic Traffic Control 270...
Страница 300: ...CHAPTER 11 Quality of Service Attaching a Policy Map to a Port 300...
Страница 418: ...CHAPTER 13 Security Measures DHCP Snooping 418...
Страница 588: ...CHAPTER 15 IP Configuration Setting the Switch s IP Address IP Version 6 588...
Страница 606: ...CHAPTER 16 IP Services Configuring the PPPoE Intermediate Agent 606...
Страница 676: ...CHAPTER 17 Multicast Filtering Multicast VLAN Registration for IPv6 676...
Страница 772: ...CHAPTER 20 System Management Commands Switch Clustering 772...
Страница 802: ...CHAPTER 22 Remote Monitoring Commands 802...
Страница 808: ...CHAPTER 23 Flow Sampling Commands 808...
Страница 872: ...CHAPTER 24 Authentication Commands PPPoE Intermediate Agent 872...
Страница 950: ...CHAPTER 25 General Security Measures Port based Traffic Segmentation 950...
Страница 1002: ...CHAPTER 27 Interface Commands Power Savings 1002...
Страница 1016: ...CHAPTER 28 Link Aggregation Commands Trunk Status Display Commands 1016...
Страница 1046: ...CHAPTER 30 Congestion Control Commands Automatic Traffic Control Commands 1046...
Страница 1058: ...CHAPTER 32 UniDirectional Link Detection Commands 1058...
Страница 1064: ...CHAPTER 33 Address Table Commands 1064...
Страница 1124: ...CHAPTER 35 ERPS Commands 1124...
Страница 1168: ...CHAPTER 36 VLAN Commands Configuring Voice VLANs 1168...
Страница 1182: ...CHAPTER 37 Class of Service Commands Priority Commands Layer 3 and 4 1182...
Страница 1202: ...CHAPTER 38 Quality of Service Commands 1202...
Страница 1360: ...CHAPTER 41 CFM Commands Delay Measure Operations 1360...
Страница 1382: ...CHAPTER 43 Domain Name Service Commands 1382...
Страница 1440: ...SECTION IV Appendices 1440...
Страница 1468: ...COMMAND LIST 1468...
Страница 1479: ......
Страница 1480: ...ES3528MV2 ES3528MV2 DC E112013 ST R03...