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326 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
TDynamic Buffer Allocation for an IronStack
9
PowerConnect(config)#system-max ip-route 120000
PowerConnect(config)#write memory
PowerConnect(config)#exit
PowerConnect#reload
Syntax: system-max ip-route <num>
The <num> parameter specifies the maximum number of routes in the IP route table. The
minimum value is 4096. The maximum value is 524288 (subject to route patterns for SuperX/SX).
The default is 80000 IP routes.
NOTE
If you accidentally enter a value that is not within the valid range of values, the CLI will display the
valid range for you.
To increase the number of IP subnet interfaces you can configure on each port on a device running
Layer 3 code from 24 to 64, enter the following commands.
Syntax: system-max ip-subnet-port <num>
The <num> parameter specifies the maximum number of subnet addresses per port and can be
from 24 – 128. The default is 24.
TDynamic Buffer Allocation for an IronStack
The IronStack architecture by default allocates fixed buffers on a per-priority-queue per packet-
processor basis. In instances of heavy traffic bursts to aggregation links, such as in stacking
configurations or mixed speed environments, momentary oversubscription of buffers and
descriptors may occur. This can lead to dropped packets during egress queuing.
Dell PowerConnect stackable devices provide the capability to allocate additional egress buffering
and descriptors to handle momentary bursty traffic periods, especially when other priority queues
may not be in use, or may not be experiencing heavy levels of traffic. This allows users to allocate
and fine tune the depth of priority buffer queues for each packet processor. The CLI commands for
this feature are qd-descriptor and qd-buffer. A descriptor points to one or more packet buffers.
The PowerConnect B-Series FCX is configured by default to have a fixed and shared pool of buffers
and descriptors on a per-packet processor basis. The shared pool is apportioned among the 1G,
10G, 16G, and stacking ports. This is in addition to the fixed pool of buffers and descriptors. The
shared pool is useful in scenarios of heavy traffic bursts to aggregation links. When qd commands
(qd-descriptor and qd-buffer) for the port are configured, the shared pool is disabled and the
user-defined buffer and descriptor thresholds are applied. The system will fall back to the default
behavior when the qd commands are un-configured.
The 48-port PowerConnect stackable switch has 2 packet processors. The 24-port PowerConnect
stackable switch has a single packet processor. In an IronStack, each stack unit has the possibility
of two packet processors, but the second processor for a 24-port stack unit cannot be configured.
The number of actual available packet processors depends on the type and number of switches in
the stack.
PowerConnect(config)#system-max ip-subnet-port 64
PowerConnect(config)#write memory
PowerConnect(config)#exit
PowerConnect#reload