The value of vRtrInetStaticRouteCpeAddrType specifies the address
type of vRtrInetStaticRouteCpeAddr address.
When the value of vRtrInetStaticRouteCpeAddrType is not 'unknown',
statitistics for the Customer-Provided Equipment (CPE) host checks
for this static route entry will be found in the sparsely dependent
table extension, vRtrInetStatRteCpeChkStatsTable.