Chapter 39: Multicast Filtering Commands
IGMP Snooping
– 1164 –
messages is not required and may be disabled using the
no
ip igmp
snooping vlan mrd
command.
•
This command may also be used to disable multicast router solicitation
messages when the upstream router does not support MRD, to reduce
the loading on a busy upstream router, or when IGMP snooping is
disabled in a VLAN.
E
XAMPLE
This example disables sending of multicast router solicitation messages on
VLAN 1.
Console(config)#no ip igmp snooping vlan 1 mrd
Console(config)#
ip igmp snooping
vlan proxy-address
This command configures a static source address for locally generated
query and report messages used by IGMP proxy reporting. Use the
no
form
to restore the default source address.
S
YNTAX
[
no
]
ip igmp snooping vlan
vlan-id
proxy-address
source-address
vlan-id
- VLAN ID (Range: 1-4094)
source-address
- The source address used for proxied IGMP query
and report, and leave messages. (Any valid IP unicast address)
D
EFAULT
S
ETTING
0.0.0.0
C
OMMAND
M
ODE
Global Configuration
C
OMMAND
U
SAGE
IGMP Snooping uses a null IP address of 0.0.0.0 for the source of IGMP
query messages which are proxied to downstream hosts to indicate that it
is not the elected querier, but is only proxying these messages as defined
in RFC 4541. The switch also uses a null address in IGMP reports sent to
upstream ports.
Many hosts do not implement RFC 4541, and therefore do not understand
query messages with the source address of 0.0.0.0. These hosts will
therefore not reply to the queries, causing the multicast router to stop
sending traffic to them.
To resolve this problem, the source address in proxied IGMP query and
report messages can be replaced with any valid unicast address (other
than the router's own address) using this command.
Rules Used for Proxy Reporting
Summary of Contents for SSE-G2252
Page 42: ...44 General IP Routing on page 627...
Page 603: ...Chapter 16 IP Configuration Setting the Switch s IP Address IP Version 6 609...
Page 883: ...Chapter 24 General Security Measures Port based Traffic Segmentation 894...
Page 989: ...Chapter 30 Congestion Control Commands Automatic Traffic Control Commands 1000 Console...
Page 1007: ...Chapter 33 Address Table Commands 1019...
Page 1137: ...Chapter 38 Quality of Service Commands 1150...