H3C Technologies H3C S12500-X Series Switches - Manual (Page 14)

7
Access modes of VSIs
The access mode of a VSI determines how the VTEP processes the 802.1Q VLAN tags in the Ethernet
frames.
• VLAN access mode—Ethernet frames received from or sent to the local site must contain 802.1Q
VLAN tags.
{
For an Ethernet frame received from the local site, the VTEP removes all its 802.1Q VLAN tags
before forwarding the frame.
{
For an Ethernet frame destined for the local site, the VTEP adds 802.1Q VLAN tags to the frame
before forwarding the frame.
In VLAN access mode, VXLAN packets sent between sites do not contain 802.1Q VLAN tags. You
can use different 802.1Q VLANs to provide the same service in different sites.
• Ethernet access mode—The VTEP does not process the 802.1Q VLAN tags of Ethernet frames
received from or sent to the local site.
{
For an Ethernet frame received from the local site, the VTEP forwards the frame with the 802.1Q
VLAN tags intact.
{
For an Ethernet frame destined for the local site, the VTEP forwards the frame without adding
802.1Q VLAN tags.
In Ethernet access mode, VXLAN packets sent between VXLAN sites contain 802.1Q VLAN tags.
You must use the same VLAN to provide the same service between sites.
ARP flood suppression
ARP flood suppression reduces ARP request broadcasts by enabling the VTEP to reply to ARP requests on
behalf of VMs.
As shown in
Figure 7 , this feature snoops ARP packets to populate the ARP flood suppression table with
local and remote MAC addresses. If an ARP request has a matching entry, the VTEP replies to the request
on behalf of the VM. If no match is found, the VTEP floods the request to both local and remote sites.