关于show platform tcam utilization这张表该怎么看呢？

ccnafasttrack

Switch# show platform tcam utilization

CAM Utilization for ASIC# 0 Max Used
Masks/Values Masks/values
Unicast mac addresses: 6364/6364 31/31
IPv4 IGMP groups + multicast routes: 1120/1120 1/1
IPv4 unicast directly-connected routes: 6144/6144 4/4
IPv4 unicast indirectly-connected routes: 2048/2048 2047/2047
IPv4 policy based routing aces: 452/452 12/12
IPv4 qos aces: 512/512 21/21
IPv4 security aces: 964/964 30/30

Note: Allocation of TCAM entries per feature uses
a complex algorithm. The above information is meant
to provide an abstract view of the current TCAM utilization
就拿非直连路由条目来说，2048和2047一个是代表总共可以存储这么多路由条目，一个是已经占用了这么多吗？另外这指的是我们平常在路由器上看到的路由条目吗？
另外文档上划线部分是什么意思？