Configuring Shared And Dedicated Buffer Memory Pools - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide

Configuring Shared and Dedicated Buffer Memory Pools

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The ACX5048 and ACX5096 router has 12 megabytes of Packet Forwarding Engine (PFE)
wide common packet buffer memory that is used to store packets on interface queues.
The buffer memory is divided into two pools, shared buffers and dedicated buffers or
reserved buffers.
Shared buffers are a global memory pool that the router allocates dynamically to ports
as needed, so the buffers are shared among the ports. To configure a maximum amount
of shared buffer that the multicast packets can consume, include the
CLI statement at the [
edit class-of-service schedulers scheduler-name shared-buffer
] hierarchy level. The value that you can specify for
maximum
command can be from 0 through 100 percent. If the
is not added, then the value defined by the
is used for multicast packets as well.
Dedicated buffers or reserved buffers are a memory pool divided equally among the
router ports. Each port receives a minimum guaranteed amount of buffer space, dedicated
to each port, not shared among ports. To configure a dedicated buffer for multicast
packets, include the
buffer-partition multicast percentage
class-of-service schedulers scheduler-name buffer-size
you can specify for buffer-partition multicast percentage
through 100 percent. If the
configured, then a default value of 25% is reserved for multicast packets.
NOTE: The total amount of actual queue buffer is defined using the
CLI command.
To configure shared and dedicated buffers, include the
buffer-partition multicast percentage
level:
[edit class-of-service]
schedulers {
scheduler-name {
buffer-size (percent percentage | remainder | temporal microseconds | buffer-partition
multicast percent percentage );
shared-buffer maximum (percent percentage | multicast percentage);
}
}
The following is a sample configuration for shared and dedicated buffers in ACX5048
and ACX5096 routers:
[edit class-of-service]
schedulers schd1{
buffer-size percent 80;
buffer-partition {
multicast {
percent 30;
multicast percentage
shared-buffer maximum percent percentage
buffer-partition multicast percentage
CLI statements at the
multicast percentage
multicast percentage
CLI statement
CLI statement at the [
edit
] hierarchy level. The value that
CLI command can be from 0
CLI statement is not
buffer-size
and
multicast percentage
hierarchy
[edit class-of-service]
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