The tVrrpIpv6RouterAdvertEntry provides VRRP specific extension to the
ipv6RouterAdvertEntry in the IP-MIB.
Use of AUGMENTS clause implies a one-to-one dependent relationship
between the base table, ipv6RouterAdvertTable, and the augmenting
table, tVrrpIpv6RouterAdvertTable. This in effect extends the
ipv6RouterAdvertTable with additional columns.
Creation (or deletion) of a row in the ipv6RouterAdvertTable results
in the same fate for the row in the tVrrpIpv6RouterAdvertTable.