Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 292)

262 Multi-Service IronWare Switching Configuration Guide
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ISID mapping to VPLS
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ISID mapping to VPLS
The ISID m apping to VPLS feature allows the service instance to be identified end-to-end across
the Ethernet and VPLS networks using the same value without modifying how the MPLS network
operates. When the PBB packet is sent out on the MPLS cloud, the ISID is always preserved in the
packet as the payload tag. A VPLS instance can recognize PBB packets only when it is configured in
tagged-mode.
Figure 35 illustrates this feature.
FIGURE 35 ISID mapping
ISID endpoint configuration considerations
• ISID range is between 256 (0x100) and 16777214 (0xFFFFFE).
• ISID endpoints can be configured only if the VPLS instance is using the tagged mode.
• You cannot mix ISID with non-ISID endpoints in the same VPLS instance.
• All endpoints within a VPLS instance should have the same ISID.
• For remote switching, you must configure the same ISID on both the ingress and egress
routers.
• You cannot configure more than one ISID endpoint on the same port in the same VPLS
instance.
• Multicast snooping will not be allowed on a VPLS instance which contains ISID endpoints.
• The default-max-frame-size configured must be sufficient to carry the entire packet across the
MPLS cloud.
B-DA B-SA B-TAG I-TAG C-DA C-SA S-TAG C-TAG Etype Data FCS
MPLS
L2 hdr
LSP
label PW
label B-DA B-SA I-TAG C-DA
C-SA S-TAG C-TAG Etype Data
Customer Payload
PBB Frame
MPLS Frame