14
Setting the destination UDP port number of
VXLAN packets
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Set a destination UDP
port for VXLAN packets.
vxlan udp-port port-number
By default, the destination UDP port
number is 4789 for VXLAN packets.
You must configure the same
destination UDP port number on all
VTEPs in a VXLAN.
If you modify the destination UDP port
number, only VXLAN tunnels
established after the modification use
the new port number for sending VXLAN
packets. For the new port number to
take effect on VXLAN tunnels created
before the modification, you must
disconnect and re-establish the tunnels.
Enabling ARP flood suppression
Use ARP flood suppression to reduce ARP request broadcasts.
The aging timer is fixed at 25 minutes for ARP flood suppression entries. If the suppression table is
full, the VTEP stops learning new entries. For the VTEP to learn new entries, you must wait for old
entries to age out, or use the
reset arp suppression vsi
command to clear the table.
If the
flooding disable
command is configured, set the MAC aging timer to a higher value than the
aging timer for ARP flood suppression entries on all VTEPs. This setting prevents the traffic
blackhole that occurs when a MAC address entry ages out before its ARP flood suppression entry
ages out. To set the MAC aging timer, use the
mac-address timer
command.
When remote ARP learning is disabled for VXLANs, the device does not use ARP flood suppression
entries to respond to ARP requests received on VXLAN tunnels.
To enable ARP flood suppression:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter VSI view.
vsi
vsi-name
N/A
3.
Enable ARP flood
suppression.
arp suppression enable
By default, ARP flood suppression
is disabled.
Disabling remote ARP learning for VXLANs
By default, the device learns ARP information of remote user terminals from packets received on
VXLAN tunnel interfaces. To save resources on VTEPs in an SDN transport network, you can
temporarily disable remote ARP learning when the controller and VTEPs are synchronizing entries.
After the entry synchronization is completed, use the
undo vxlan tunnel arp-learning disable
command to enable remote ARP learning.
