Mac Address Learning - Huawei quidway s7700 Configuration Manual

Quidway S7700 Smart Routing Switch
Configuration Guide - VPN

MAC Address Learning

The Ethernet network sends the broadcast packets, multicast packets and unicast packets with
unknown destination MAC addresses to all the other ports on the same Ethernet segment.
In the VPLS, the service provider network simulates network bridge devices and the PE performs
the MAC address learning. The PE must associate the destination MAC address with the PW to
Issue 01 (2011-07-15)
ASBRs of different ASs are inter-connected in back-to-back mode. Switch 1 and Switch 2
(Switch 3 and Switch 4) communicate with each other in either of the following modes:
– Option A: The devices can communicate with each other through the ordinary Ethernet
port (the VLANIF interface of the VLAN where the Ethernet port is located), Eth-Trunk
interface (the VLANIF interface of the VLAN where the Eth-Trunk interface is located),
Ethernet sub-interface, or Eth-Trunk sub-interface. Then, the ASBR Switch 1 is
considered as the CE device of the ASBR Switch 2 that accesses the VPLS network of
AS 2, and the ASBR Switch 2 as the CE of the ASBR Switch 1 that accesses the VPLS
network of AS 1. The ASBR Switch 3 and ASBR Switch 4 have the similar relationships.
– PW interconnection: Inter-AS devices functions as the peers of each other, and inter-
AS communication is established though the PW. The inter-AS PW, however, does not
follow the split horizon principle, and traffic received from the intra-AS PW is sent to
the inter-AS PW.
Switch 1 forwards received broadcast packets or unknown unicast packets as follows:
1. Switch 1 does not forward the packets to Switch 3, but directly forwards the packets
to Switch 2. That is because PE1, Switch 1, and Switch 3 are fully meshed, with PWs
established between them. Therefore, the packets from the PW side are not forwarded
back.
2. Switch 2 receives the packets sent by Switch 1 and then broadcasts these packets.
3. Switch 4 receives the packets sent by Switch 2 and then broadcasts these packets.
4. Switch 3 receives the packets sent by Switch 4 and then broadcasts these packets.
– Option A: mVSIs need to be created between Switch 1 and Switch 3, and between
Switch 2 and Switch 4.
A ring is formed by Switch 1, Switch 2, Switch 4, and Switch 3. The ring is composed
of two inter-AS service PWs and two intra-AS mPWs.
After STP is configured on the ring, the link between Switch 3 and Switch 4 is blocked,
the associated service PW of the service VSI is also blocked, and then service traffic is
transmitted along the link between Switch 1 and Switch 2.
If the link between Switch 1 and Switch 2 fails, after STP convergence, service traffic
is switched to and transmitted on the link between Switch 3 and Switch 4.
– PW interconnection: mVSIs need to be created between Switch 1 and Switch 3, and
between Switch 2 and Switch 4.
A ring is formed by Switch 1, Switch 2, Switch 4, and Switch 3. The ring is composed
of two inter-AS mPWs and two intra-AS mPWs. After STP is configured on the ring,
the mPW between Switch 3 and Switch 4 is blocked, and then service traffic is
transmitted along the link between Switch 1 and Switch 2.
When the mPW and inter-AS PW are blocked, the associated service PWs are also
blocked.
If the PW between Switch 1 and Switch 2 fails, after STP convergence, service traffic
is switched to and transmitted on the service PW between Switch 3 and Switch 4.
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