Per-Port Buffer Sizes; Routing And Forwarding Tables - HP ProCurve 3500-24 Reference Manual

Per-port buffer sizes

The HP ProCurve Switch 8200zl, 5400zl, 3500, and 6200yl series have eight hardware queues to which
prioritized traffic can be assigned . Software can designate a certain amount of output memory buffer for
each queue to minimize the impact from events that exceed line rate such as bursty network traffic . Users can
choose to configure the number of queues—2, 4, or 8—so that they can optimize the amount of memory buffer
per queue for their applications . For example, if a user has only 2 priorities on the network, that user should
configure for 2 queues so that all the buffer memory is assigned to only 2 queues . The following tables identify
the buffer sizes allocated on a per-port basis to the normal and other priority queues in each configuration .
Table 11. Per-port priority queue buffer sizes for 8 queues
Port speed
1 Gbps
10 Gbps
Table 12. Per-port priority queue buffer sizes for 4 queues
Port speed
1 Gbps
10 Gbps
Table 13. Per-port priority queue buffer sizes for 2 queues
Port speed
1 Gbps
10 Gbps

Routing and forwarding tables

The HP ProCurve Switch 8200zl, 5400zl, 3500, and 6200yl series have several routing and forwarding table
features that enhance routing and switching performance .
Every line interface module has its own "best match prefix" routing table that contains IP routes and is used
for determining how to route the vast majority of incoming packets . Using the best match prefix routing table is
extremely fast and enables wire-speed routing to be achieved .
If the best match prefix routing table does not contain an entry that can be used to determine the route of a
received packet, then the main routing table is used . The main routing table can contain up to 10,000 routing
table entries .
For Layer 2 forwarding, each switch has a forwarding or MAC table that can contain up to 65,536 entries .
Size of normal priority queue (KB)
194 KB (30%)
225 KB (30%)
Size of normal priority queue (KB)
480 KB (70%)
538 KB (70%)
Size of normal priority queue (KB)
618 KB (90%)
691 KB (90%)
Size of other priority queues (KB)
70 KB (10%)
77 KB (10%)
Size of other priority queues (KB)
68 KB (10%)
76 KB (10%)
Size of other priority queues (KB)
68 KB (10%)
76 KB (10%)
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