V-Vpls Mac Learning And Packet Forwarding - Nokia 7302 Manual

Virtual Private LAN Service
The virtual port plays the role of a physical connection between a v-VPLS and VPRN.
The virtual port is auto-created at NT start-up time and is automatically associated
with each v-VPLS instance when the v-VPLS is created. The virtual port is not visible
to the v-VPLS and v-VPLS SAPs are not associated with the virtual port. The VPRN
service does support SAP configuration on the virtual port, and is able to process
frames that match the respective v-VPLS and VPRN SAP VLAN tags.
5.3.2.6
The ISAM edge devices perform the packet replication required for broadcast and
multicast traffic across the bridged domain. MAC address learning is performed by
the ISAM to reduce the amount of unknown destination MAC address flooding.
The NT learns the source MAC addresses of the traffic arriving on its access, hybrid,
and network ports. Each ISAM maintains a Forwarding Information Base (FIB) for
each VPLS service instance and learned MAC addresses are populated in the FIB
table of the service. All traffic is switched based on MAC addresses. Unknown
destination packets (i.e., the destination MAC address has not been learned) are
forwarded to the ports of the ISAM v-VPLS service associated to the ingress port,
until the target station responds and the MAC address is learned by that v-VPLS
service
Self-learning process
The following describes the self-learning process for v-VPLS related data and control
frames received by the IHUB:
•
•
•
166
The virtual port works in d1q mode and is used for
Note 1 —
general L3 applications. See the documentation on VRF IP
Interface creation for details.
The virtual port is not used by the m-VPLS.
Note 2 —

v-VPLS MAC Learning and Packet Forwarding

When a frame is received from an SAP and the source MAC address is unknown
in the FDB, the system self-learns this source MAC address in relation with this
SAP in its v-VPLS FDB. This new entry is used to forward frames using this MAC
address as destination. The frame is processed on the IHUB by a v-VPLS service.
The system initializes the new FDB entry as "in use".
When a frame is received from an SAP and the source MAC address has already
been self-learned on this same SAP in the v-VPLS FDB (it is a dynamic FDB
entry), this entry is refreshed as "in use", to prevent aging.
When a frame is received from an SAP on a regular (network-facing) port, with the
source MAC address being equal to one of the ISAM port or the ISAM system
MAC address, no learning takes place, the frame is discarded and a "duplicate
self MAC" alarm is generated.
3HH-11985-AAAA-TQZZA
FD 100/320Gbps NT and FX NT IHub Services Guide
Issue: 13