The value of vRtrIfIpcpSecDnsAddrType specifies the type of
vRtrIfIpcpSecDnsAddr, the IP address of the secondary DNS to be used
by the remote peer.
vRtrIfIpcpSecDnsAddrType can be set to non-deffault only when the
following rules are met for objects in vRtrIfEntry with the same
indices:
- The value of vRtrIfType is set to serviceIes(3) or serviceVprn(5)
- The value of tmnxPortEncapType in tmnxPortEntry indexed using
the value of vRtrIfPortID is set to unknown (0) or nullEncap (1)
or ipcpEncap (6)
When the value of vRtrIfIpcpSecDnsAddrType is unknown, the value of
vRtrIfIpcpSecDnsAddr is assumed to be of size 0.