Traffic From A Remote Site To The Local Site; Layer 2 Forwarding; Mac Learning; Unicast - H3C S10500 Series Configuration Manual

Traffic from a remote site to the local site

When a VXLAN packet arrives at a VXLAN tunnel interface, the VTEP uses the VXLAN ID in the
packet to identify its VXLAN.

Layer 2 forwarding

MAC learning

The VTEP performs Layer 2 forwarding based on a VSI's MAC address table. The VTEP learns MAC
addresses by using the following methods:
•
Local MAC learning—The VTEP automatically learns the source MAC addresses of frames
sent from the local site. The outgoing interfaces of local MAC address entries are site-facing
interfaces on which the MAC addresses are learned.
•
Remote MAC learning—The VTEP uses MP-BGP to advertise local MAC reachability
information to remote sites and learn MAC reachability information from remote sites. The
outgoing interfaces of MAC address entries advertised from a remote site are VXLAN tunnel
interfaces.

Unicast

As shown in
the local site.
Figure 4 Intra-site unicast
As shown in
1. The source VTEP encapsulates the Ethernet frame in the VXLAN/UDP/IP header.
In the outer IP header, the source IP address is the source VTEP's VXLAN tunnel source IP
address. The destination IP address is the VXLAN tunnel destination IP address.
2. The source VTEP forwards the encapsulated packet out of the outgoing VXLAN tunnel
interface found in the VSI's MAC address table.
3. The intermediate transport devices (P devices) forward the packet to the destination VTEP by
using the outer IP header.
Figure 4, the VTEP performs typical Layer 2 forwarding for known unicast traffic within
Figure 5, the following process applies to a known unicast frame between sites:
4