This attribute specifies the default holding priority which applies to
SVC nrt-VBR connections. It takes a value from 0 (highest priority)
to 4 (lowest priority). In a situation where the link bandwidth
fluctuates, such as over an IMA link, holding priority is used to
determine which connections are held and which are released.
Holding priority 4 connections are the first to be released. Holding
priority 0 connections are the last to be released.
This attribute has been obsoleted and its value migrated to
holdingPriority attribute.