Figure 22 Network Port Egress Packet Format And Flooding - Nokia 7302 Manual

Virtual Private LAN Service
2 PE-Router-A learns the source MAC address in the packet and creates an entry
3 The destination MAC address in the packet is looked up in the FIB table for the
4 For a Known MAC Address (see Figure 22):
5 PE-Router-A chooses a transport LSP to send the customer packets to
6 For an Unknown MAC Address (see Figure 22):
Figure 22
172
in the FIB table that associates the MAC address to the service access point
(SAP) on which it was received.
VPLS in- stance. There are two possibilities: either the destination MAC address
has already been learned (known MAC address) or the destination MAC address
is not yet learned (unknown MAC address).
If the destination MAC address has already been learned by PE-Router-A, an
existing entry in the FIB table identifies the far-end PE-Router and the service
VC-label (inner label) to be used before sending the packet to far-end
PE-Router-C.
PE-Router-C. The customer packet is sent on this LSP once the IEEE 802.1Q tag
is stripped and the service VC-label (inner label) and the transport label (outer
label) are added to the packet.
If the destination MAC address has not been learned, PE-Router-A will flood the
packet to both PE-Router-B and PE-Router-C that are participating in the service
by using the VC-labels that each PE-Router previously signaled for the VPLS
instance. Note that the packet is not sent to PE-Router-D since this VPLS service
does not exist on that PE-Router.
Network Port Egress Packet Format and Flooding
Pre-assigned and
signaled by PE 'C'
Tunnel VC
label label X
Customer
Location A
PE A
B
Apply VC and
tunnel labels
Tunnel VC
: virtual bridge
B
label label Y
Pre-assigned and
signaled by PE 'B'
3HH-11985-AAAA-TQZZA
FD 100/320Gbps NT and FX NT IHub Services Guide
PE C
Dest Src Customer
MAC MAC packet
B
IP/MPLS
network
B
PE B
Dest Src Customer
MAC MAC packet
Issue: 13