This attribute is used to enable or disable support for
SourceRouteEndStation (Sres). If set to enable, Sres will be supported
on this protocol on this ProtocolPort (Pp). If set to disable, it will not be
supported. An Sres component must be provisioned under the
VirtualRouter if this attribute is set to enable. If this attribute is set to
enable and this Pp has its linkToMedia attribute set, it must be linked to
a LanApplication (La) that has its Framer interfaceName linked to a
Fddi or TokenRing component.