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Chapter 4
Cisco's Diagnostic Commands
20 failures (0 no memory)
VeryBig buffers, 4520 bytes (total 10, permanent 10):
10 in free list (0 min, 300 max allowed)
177588 hits, 10 misses, 1 trims, 1 created
10 failures (0 no memory)
Large buffers, 5024 bytes (total 10, permanent 10):
10 in free list (0 min, 30 max allowed)
10 hits, 0 misses, 0 trims, 0 created
0 failures (0 no memory)
Huge buffers, 18024 bytes (total 0, permanent 0):
0 in free list (0 min, 13 max allowed)
0 hits, 0 misses, 0 trims, 0 created
0 failures (0 no memory)
Header pools:
You can view six buffer distinctions in this output: small, middle, big, very
big, large, and huge; and each division is allocated a different amount of buffer
space. The output details the buffer name and its size, with the buffer size
following immediately after its name. The (total 120, permanent 120) for
the small pool specifies that there are a total of 120 spaces allocated to the
small pool. The permanent means that the 120 buffer spaces are permanently
assigned to the small buffer pool. When a buffer's space is permanent, it can-
not be de-allocated and given back to the system memory for other uses.
In the next field, you can see the number of free buffer spaces that are
open to accepting a packet. Each pool maintains a minimum and maximum
threshold, which it uses to decide whether more buffer space needs to be allo-
cated to the pool. This is seen in the min and max allowed.
The last two lines of information given for each pool describe the activity
happening there. This information, which includes all hits, misses, trims, cre-
ated, and failures, is described in the following list:
Hits Represents how many times the pool was used successfully.
Misses Represents the number of times a packet tried to find a space
within a pool, but found no available spaces.
Trims Represents the number of spaces removed from the pool because
the amount exceeded the number of allowed buffer spaces.
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