357
Figure 95 Source MAC address learning on a PE
If no packet is received from a MAC address before the aging timer expires, VPLS deletes the MAC
address to save MAC address table resources.
When an AC or a PW goes down, the PE deletes MAC addresses on the AC or PW. Then it sends an
LDP address withdrawal message to notify all other PEs in the VPLS instance to delete those MAC
addresses.
Unicast traffic forwarding and flooding
After a PE receives a unicast packet from an AC, the PE searches the MAC address table of the VSI
bound to the AC to determine how to forward this packet.
•
If a match is found, the PE forwards the packet according to the matching entry. If the outgoing
interface in the entry is a PW, the PE inserts the PW label to the packet, and adds the public
tunnel header to the packet. It then forwards the packet to the remote PE over the PW. If the
outgoing interface in the entry is a local interface, the PE directly forwards the packet to the
local interface.
•
If no match is found, the PE floods the packet to all other ACs and PWs in the VSI.
After a PE receives a unicast packet from a PW, the PE searches the MAC address table of the VSI
bound to the PW to determine how to forward this packet.
•
If a match is found, the PE forwards the packet through the egress interface in the matching
entry.
•
If no match is found, the PE floods the packet to all ACs in the VSI.
Multicast and broadcast traffic forwarding and flooding
After a PE receives a multicast or broadcast packet from an AC, the PE floods the packet to all other
ACs and the PWs in the VSI bound to the AC.
After a PE receives a multicast or broadcast packet from a PW, the PE floods the packet to all ACs in
the VSI bound to the PW.
MAC A IP 1.1.1.2
PW 3
PW 1
PW 2
MAC B IP 1.1.1.3
PE 1
PE 2
PE 3
ARP broadcast
ARP response
VPN 1
A
Vlan 10, port 1
VPN 1
B
PW 1
VSI
MAC
Port
PE 1
VPN 1
A
PW 3
VSI
MAC
Port
PE 3
VPN 1
VPN 1
B
VSI
MAC
A
Vlan 10, port 1
PW 1
Port
PE 2
MPLS or IP
backbone
VLAN 10
Port 1
VLAN 10
Port 1
VLAN 10
Port 1
Содержание FlexNetwork 5510 HI Series
Страница 9: ...vii Remote support 460 Documentation feedback 460 Index 462 ...
Страница 318: ...309 Request list 0 Retransmit list 0 ...
Страница 363: ...354 Verify that CE 1 and CE 2 can ping each other Details not shown ...
Страница 446: ...437 The MCE has redistributed the OSPF routes of the two VPN instances into the EBGP routing tables of PE 1 ...