Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 297)

Multi-Service IronWare Switching Configuration Guide 267
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ISID mapping to VPLS
10
CoS with ISID to ISID endpoints
Figure 37 illustrates the behavior when using CoS with ISID to ISID endpoints.
FIGURE 37 CoS Treatment
LEGEND:
X – original B-VLAN PCP.
Y – original ISID COS.
X’ – mapped PCP bits from internal priority (X contributes to internal priority) using PCP encode
table.
V – mapped EXP bits from internal priority (X contributes to internal priority) using EXP encode
table.
Z – incoming EXP bits as described by Tunnel/VC label column = V or internal priority.
W – mapped PCP from internal priority (Z contributes to internal priority) using PCP encode table.
The ‘or’ option in the Tunnel/VC label column is to differentiate when ‘qos exp encode policy’ is on
(default) or off.
The ‘or’ option in the Outgoing B-VLAN column is to differentiate when ‘qos pcp encode policy’ is on
(default) or off.
Local switching
The following configuration guidelines should be considered for local switching when using CoS
with ISID to ISID endpoints.
• The Internal priority is mapped from the outer VLAN CoS in the incoming packet or incoming
port’s priority using the decode map.
• The outgoing outer VLAN CoS is mapped from internal priority using egress encoding map by
default. The internal priority does not affect the outgoing ISID CoS.
Incoming Packet Outgoing Packet
B-VLAN PCP ISID COS B-VLAN PCP ISID COS
X Y X’ or X Y
Local Switching -
Incoming Packet MPLS Cloud Outgoing Packet
B-VLAN
PCP
ISID COS Tunnel / VC
Label EXP (Z)
Payload Tag
COS
B-VLAN
PCP
ISID COS
X Y V or internal
priority
Y W or Y Y