H3C Technologies H3C S12500-X Series Switches - Manual (Page 22)

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NOTE:
For a multicast-mode VXLAN, the VTEP does not flood traffic to unicast tunnels when multicast tunnels are
down.
To configure a multicast-mode VXLAN:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter VSI view. vsi vsi-name N/A
3. Enter VXLAN view. vxlan vxlan-id N/A
4. Assign a multicast group
address for flood traffic, and
specify a source IP address
for multicast VXLAN packets.
group group-address
source source-address
By default, a VXLAN uses unicast mode for
flood traffic. No multicast group address or
source IP address is specified for multicast
VXLAN packets.
You must assign all VTEPs in a multicast-mode
VXLAN to the same multicast group.
For multicast traffic to be forwarded correctly,
you must use the source IP address of an up
VXLAN tunnel as the source IP address for
multicast VXLAN packets.
5. Enter the view of the
interface that provides the
source IP address for
multicast VXLAN packets.
interface interface-type
interface-number
The source source-address option in the
group command specifies the source IP
address of multicast VXLAN packets.
6. Enable the IGMP host
feature.
igmp host enable
By default, the IGMP host feature is disabled
on an interface.
The IGMP host feature enables the interface
to send IGMP reports in response to IGMP
queries before it can receive traffic from the
multicast group.
This command takes effect only if IP multicast
routing is enabled.
Confining unknown-unicast floods to the local site
By default, the VTEP floods unknown unicast frames received from the local site to the following interfaces
in the frame's VXLAN:
• All site-facing interfaces except for the incoming interface.
• All VXLAN tunnel interfaces.
To confine unknown-unicast floods to site-facing interfaces for a VXLAN:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter VSI view. vsi vsi-name N/A