Specifications

Switching set switch port 8-175
Software Release 2.7.3
C613-03098-00 REV A
the value none or 0 is specified, then packet rate limiting for broadcast packets
is turned off. If another value is specified, the reception of broadcast packets is
limited to this number. See the note below for important information about
packet rate limiting. The default is none.
Limiting packet reception rates for different classes of packets depends on the
particular switch hardware. In particular, groups of ports may have to have the
same limits set, and the same limit may be set for the different types of packets,
depending on the hardware. When packet rate limits are set on switches with
this type of constraint, the most current parameter values supersede earlier
ones. When a command for specific ports changes parameters for other ports, a
message reports these changes.
Packet storm protection limits cannot be set for each individual port on the
switch, but can be set for each processing block of ports. The processing blocks
are sets of 8 ports (e.g. as many as are applicable of ports 1-8, 9-16 and 17-24)
and each uplink port is a further processing block. Therefore, a 16-port switch
has four processing blocks and a 24-port switch has five. The two uplink ports
are numbered sequentially after the last port, and therefore are 17 and 18 for a
16-port and 25 and 26 for a 24-port switch. Only one limit can be set per
processing block, and then applies to all three packet types. Thus each of the
packet types are either limited to this value, or unlimited (none).
For the Rapier G6 series switches, each port is a processing block, and therefore
packet storm protection limits can be set for each port individually.
The description parameter can be used to describe the port. It is displayed by
the show switch port command on page 8-222, but does not affect the
operation of the switch in any way. The default is no description.
The dlflimit parameter specifies a limit on the rate of reception of destination
lookup failure packets for the port. The value of this parameter represents a per
second rate of packet reception above which packets will be discarded for
destination lookup failure packets. If the value none or 0 is specified, then
packet rate limiting is turned off for these packets. If another value is specified,
the reception of these packets is limited to this number. See the note after the
bclimit parameter description for important information about packet rate
limiting. The default is none. If packet storm protection limits are set on the
switch, the port parameter must specify complete processing blocks.
A destination lookup failure packet is one for which the switch hardware does
not have a record of the destination address of the packet, either Layer 2 or
Layer 3 address. These packets are passed to the CPU for further processing, so
limiting the rate of reception of these packets may be a desirable feature to
improve system performance.
On the Rapier i Series switches only, the egresslimit parameter specifies the
maximum bandwidth for traffic egressing a specific port in kbps (10/100 Mbps
ports) or Mbps (Gigabit ports). If none or 0 (zero) is specified, egress limiting is
disabled for the specified port. For 10/100 Mbps ports the input value
(1000..127000) in kbps is rounded up to the nearest 1000 (or 1 Mbps). For
Gigabit ports the input value (8..1016) in Mbps is rounded up to the nearest 8
Mbps. The default is none.
The infiltering parameter enables or disables Ingress Filtering of frames
admitted according to the acceptable parameter, on the specified ports. Each
port on the switch belongs to one or more VLANs. If infiltering is set to on,
Ingress Filtering is enabled; frames received on a specified port are admitted
when the port belongs to the VLAN with which the frames are associated.
Conversely, frames are discarded when the port does not belong to the VLAN