Configuring No-Drop Buffer Thresholds - Cisco Nexus 5000 Series Configuration Manual

Configuring No-Drop Buffer Thresholds

Configuring No-Drop Buffer Thresholds
Beginning with Cisco NX-OS Release 5.0(2)N1(1), you can configure the no-drop buffer threshold settings
for 3000m lossless Ethernet.
To achieve lossless Ethernet for both directions, the devices connected to the Cisco Nexus 5548 switch
Note
must have the similar capability. The default buffer and threshold value for the no-drop can ensure lossless
Ethernet for up to 3000 meters.
SUMMARY STEPS
1. switch# configure terminal
2. switch(config)# policy-map type network-qos policy-map name
3. switch(config-pmap-nq)# class type network-qos class-map name
4. switch(config-pmap-nq-c)# pause no-drop buffer-size buffer-size pause-threshold xoff-size
resume-threshold xon-size
5. (Optional) switch(config-pmap-nq-c)# no pause no-drop buffer-size buffer-size pause-threshold
xoff-size resume-threshold xon-size
6. switch(config-pmap-nq-c)# exit
7. switch(config-pmap-nq)# exit
DETAILED STEPS
Command or Action
Step 1 switch# configure terminal
Step 2 switch(config)# policy-map type
network-qos policy-map name
Step 3 switch(config-pmap-nq)# class type
network-qos class-map name
Step 4 switch(config-pmap-nq-c)# pause no-drop
buffer-size buffer-size pause-threshold
xoff-size resume-threshold xon-size
Cisco Nexus 5000 Series NX-OS Quality of Service Configuration Guide
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Purpose
Enters configuration mode.
Enters policy-map network-qos class mode and identifies the policy map
assigned to the type network-qos policy map.
References an existing network QoS class map in a policy map and enters
class mode.
Specifies the buffer threshold settings for pause and resume for 3000m
lossless Ethernet:
• buffer-size—Buffer size for ingress traffic, in bytes. Valid values are
from 10240 to 490880.
On a Cisco Nexus 5020 switch, you can configure a maximum
Note
buffer size of 143680 bytes.
On a Cisco Nexus 5548 switch, you can configure a maximum
buffer size of 152000 bytes.
• pause-threshold—Specifies the buffer limit at which the port pauses
the peer.
• xoff-size—Buffer limit for pausing, in bytes. Valid values are 0 to
490880.
Configuring QoS
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