Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 314)

284 Multi-Service IronWare Switching Configuration Guide
53-1003036-02
Backbone Edge Bridge (BEB) operation
11
FIGURE 45 1:1 customer to ISID mapping
N:1 Customer to ISID Mapping Interop (S-VLAN Keep Mode)
The benefits of N:1 customer to ISID mapping include the following:
• Multiple customers are mapped to the same SI to use the same ISID.
• The S-VLAN at the ingress is carried all the way to the egress side of the PBB network.
• When flooding of a packet is required, it only floods to the endpoints that have the same S-VID.
Brocade NetIron XMR and Brocade MLX series supports S-VLAN Keep Mode. This deviates from
true N:1 Customer to ISID mapping in that it will NOT have different flooding domains based on the
S-VLAN, but continue to use one single flooding domain per VPLS instance. When flooding of
packets is required, it will always flood to all the endpoints (source port suppressed) within the
same VPLS instance (SI).
If the S-VLAN keep mode is desired, you must ensure that all the Brocade NetIron XMR and
Brocade MLX series nodes on the same PBB network are all configured with the S-VLAN keep
mode. Once a BEB is configured with S-VLAN keep mode any PBB frames received without the
proper S-Tag present in the PBB frame will be treated as invalid packet and discarded.