HP ProCurve 6400cl Series Management And Configuration Manual page 280

Port Traffic Controls
Rate-Limiting
13-8
Network Stress Conditions: Under normal network operating condi­
■
tions, rate-limiting limits inbound traffic on a port to no more than the
configured level. However, under network stress conditions, the port may
allow occasional bursts of inbound traffic forwarding that exceed the
configured rate.
■ Optimum Rate-Limiting Operation: Optimum rate-limiting occurs
with 64-byte packet sizes. Traffic with larger packet sizes can result in
performance somewhat below the configured inbound bandwidth. This
is to ensure the strictest possible rate-limiting of all sizes of packets.
Outbound Traffic Flow: Configuring rate-limiting on a port does not
■
control the rate of outbound traffic flow on the port.
■ Rate-Limiting Effect on Port Trunks: Rate-Limiting is not supported
on ports configured in a trunk group. Configuring a port for rate-limiting
and then adding it to a trunk suspends rate-limiting on the port while it is
in the trunk. Attempting to configure rate-limiting on a port that already
belongs to a trunk generates the following message:
< port-list >: Operation is not allowed for a trunked port.
■ Traffic Filters on Rate-Limited Ports: Configuring a traffic filter on a
port does not prevent the switch from including filtered traffic in the
bandwidth-use measurement for rate-limiting. That is, where rate-limiting
and traffic filtering are configured on the same port, the inbound, filtered
traffic is included in the bandwidth measurement for calculating when the
limit has been reached. Traffic filters include:
• ACLs
• Source-Port filters
• Protocol filters
• Multicast filters
■ Rate-Limiting Not Recommended on Mesh Ports: Rate-Limiting can
reduce the efficiency of paths through a mesh domain.