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JUNOSe 11.1.x Policy Management Configuration Guide
Number of CAM Entries Per Allocation and Free Entries
The total number of CAM blocks is divided into two equal partitions. The first or
lower half of the CAM blocks is reserved for 144-bit CAM entries, and the second or
higher half of CAM blocks is reserved for the combination of 288-bit and 576-bit
CAM entries, when an IPv6 policy that contains 288-bit or 576-bit CAM entries is
attached to an interface. If IPv6 policies do not contain 288-bit or 576-bit CAM entries,
all the blocks are used for 144-bit entries.
Assume that, on a GE-2 line module, out of the total of eight blocks, four blocks are
completely used for 144-bit CAM entries and the remaining four blocks are allocated
in common for 144-bit, 288-bit, and 576-bit entries. Each of the blocks reserved
exclusively for 144-bit entries can contain 8000 entries, while each of the blocks
reserved for the combination of the variable-sized entries can either contain 2000
576-bit entries or 4000 288-bit entries. The block that is common to the variable-sized
entries is available for 144-bit entries only if an IPv6 policy does not contain 288-bit
or 576-bit entries. Otherwise, when the first IPv6 policy that contains 288-bit or
576-bit entries is attached to an interface and if previously configured policies
consumes more than 4 blocks, the IPv6 policy attachment fails.
The block that is common to the variable-sized entries is not available for 144-bit
CAM entries when you configure any 288-bit or 576-bit entries, even though you
remove them later. It is also not available for any 288-bit or 576-bit entries when
the 144-bit entries spill into this block, even though you remove the 144-bit entries
later.
NOTE: ES2 4G LMs contain a total of 32 blocks, of which 16 blocks are assigned for
144-bit entries. The remaining 16 blocks are assigned for the combination of 144-bit,
288-bit, and 576-bit entries (pool common to these three variable-sized entries).
Table 28 on page 176 lists the maximum policies supported with variable length IPv6
CAM classification and one classifier per policy. The following note is referred to in
Table 28 on page 176.
1.
Table 28: Maximum Policies with One Classifier per Policy for GE-2 LMs
Number/Type of
Total 144-bit
Policies
CAM entries
All IPv4 policies
64,000
All IPv6 policies
64,000
176
Performance Impact and Salability Considerations
The number of unique policies supported depends on the line module and the
numbers used are to illustrate the impact with CAM entries. The actual policies
vary according to the line module.
Number of
IPv4 policies
Number of
(144-bit) with
IPv6 policies
one CLACL
(144-bit) with
(See Note 1)
one CLACL
64,000
0
0
64,000
Number of
Number of
IPv6 policies
IPv6 policies
(288-bit) with
(576-bit) with
one CLACL
one CLACL
(See Note 1)
(See Note 1)
0
0
0
0
Number of
maximum
policies per
LM (one
CLACL per
policy) (See
Note 1)
64,000
64,000
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