H3C Technologies H3C S6800 Series Switches - Manual (Page 24)

16
• Enable IP multicast routing on all VTEPs and transport network devices.
• Configure IGMP and a multicast routing protocol on transport network devices. Because a VTEP
can be both a multicast source and multicast group member, H3C recommends that you use
BIDIR-PIM.
NOTE:
A multicast-mode VXLAN does not use unicast routing tunnels to forward flood traffic when its multicast
routing tunnels are down.
To configure a multicast-mode VXLAN:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enable multicast routing. multicast routing By default, multicast routing is disabled.
3. Return to system view. quit N/A
4. Enter VSI view. vsi vsi-name N/A
5. Enter VXLAN view. vxlan vxlan-id N/A
6. 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 VXLANs that use the same multicast group
address, you must configure the same source
IP address for their multicast VXLAN packets.
7. 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.
8. Enable the IGMP host
function.
igmp host enable
By default, the IGMP host function is disabled
on an interface.
The IGMP host function enables the interface
to send IGMP reports in response to IGMP
queries before it can receive traffic from the
multicast group.
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: