Tx-Limit - Cisco MWR 2941 Command Reference Manual

tx-limit

tx-limit
To specify the number of transmit buffers for an ATM virtual circuit (VC), use the tx-limit command in
ATM VC, VC-bundle, VC-class, or VC-range configuration mode. To reset the number of transmit
buffers for a particular VC to the default value, use the no form of this command.
Syntax Description buffers
Defaults Automatically computed from the VC line rate to produce a default latency of 100 milliseconds (or
whatever value is specified by the atm tx-latency command).
Command Modes
Interface-ATM-VC configuration (for an ATM VC)
VC-bundle configuration
VC-class configuration
VC-range configuration
Command History Release
12.2(18)SXE
12.2(33)SRA
12.2(33)MRB
15.0(1)MR
Usage Guidelines When you configure a VC on an ATM SPA interface, the Cisco IOS software automatically determines
the maximum number of transmit buffers that are needed by the VC for its outgoing traffic. The
Cisco IOS software uses both the configured VC line rate and latency value to calculate the number of
buffers. Each transmit buffer can contain an ATM cell (53 bytes).
By default, each VC uses the latency value that is specified by the atm tx-latency command, which
defaults to 100 milliseconds. The maximum number of transmit buffers is then calculated, so that traffic
at the maximum VC line rate can still be transmitted within this latency value.
If a particular VC's traffic flow requires a different latency value, use the tx-limit command to manually
configure the number of transmit buffers for that VC. This allows you to fine-tune the latency value on
a per-VC basis, without affecting the other VCs on the interface.
Cisco MWR 2941 Router Command Reference, Release 15.0(1)MR
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tx-limit buffers
no tx-limit
Specifies the number of buffers to be used for this VC. The valid range is 2
to 57343, with a default value that is based on the current VC line rate.
Note
Modification
This command was introduced for the ATM Shared Port Adapters (SPA) on
Catalyst 6500 series switches and Cisco 7600 series routers.
This command was integrated into Cisco IOS Release 12.2(33)SRA.
This command was integrated into Cisco IOS Release 12.2.(33)MRB.
This command was integrated into Cisco IOS Release 15.0(1)MR.
Cisco MWR 2941 Router Command Reference, Release 15.0(1)MR
Avoid configuring the buffer value as 1, as this can cause a traffic
error on the Cisco MWR 2941.
OL-23890-01