Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 298)

268 Multi-Service IronWare Switching Configuration Guide
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ISID mapping to VPLS
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• The outgoing outer VLAN CoS is same as the incoming packet’s outer VLAN CoS if the qos pcp
encode-policy off command is configured on the outgoing interface.
• The outgoing ISID CoS is the same as incoming packet’s ISID CoS. This cannot be changed by
any configuration.
Remote switching
The following configuration guidelines should be considered for remote switching when using CoS
with ISID endpoints.
Local end point to remote peer (MPLS cloud)
n guidelines should be considered for remote switching when using CoS with ISID endpoints to a
MPLS Cloud
• The internal priority is mapped from outer VLAN CoS in the incoming packet or incoming port
priority using the decode map.
• If VPLS or LSP CoS is configured, this value overrides internal priority.
• The outgoing tunnel or VC label EXP bits are mapped from internal priority using the egress
encoding map by default.
• The outgoing tunnel or VC label EXP bits are set to the internal priority if the qos exp
encode-policy off command is configured on the outgoing interface.
• The CoS of the payload tag is the same as the incoming packet ISID CoS and cannot be
overridden by any other configuration.
Remote peer (MPLS cloud) to local end point
The following configuration guidelines should be considered for remote switching when using CoS
with a MPLS Cloud to ISID endpoint.
• The internal priority is mapped from the tunnel or VC label EXP bits in the incoming packet or
incoming port priority using the decode map.
• VPLS CoS will not override internal priority.
• The outgoing outer VLAN CoS is mapped from internal priority using egress encoding map by
default. The internal priority does not affect the outgoing inner VLAN CoS.
• The outgoing outer VLAN CoS is the CoS in the payload tag if the qos pcp encode-policy off
command is configured on the outgoing interface.
• The outgoing ISID CoS is the CoS in the payload tag.
End-to-end behavior
The following configuration guidelines should be considered for remote switching when using
end-to-end behavior for CoS.
• The incoming outer VLAN CoS on the ingress router can affect the outgoing outer VLAN CoS on
the egress router by default. This can be overridden by the VPLS or LSP CoS.
• The incoming ISID CoS on the ingress router is preserved in the outgoing outer VLAN COoS if
the qos pcp encode-policy off command is configured on the outgoing interface of the egress
router.
• The incoming ISID CoS on the ingress router is always preserved in the outgoing ISID COS of
the egress router.