![]() ![]() The threshold determines the maximum number of soft buffers that can be borrowed from the common pool. The default soft buffer limit is set to 400 (which is the max threshold). The port can use up to 400% of the default allocated from common pool with default settings, which is 1200 buffers and 7200 buffers for 1 Gig interface and 10Gig interface respectively. The default buffer allocation for a 1GB port is 300 buffers and for a 10GB port, it is 1800 buffers (1 buffer = 256 bytes). Soft Buffers : These buffers are assigned to a queue but can be shared by other queues and interfaces if not used.ĭefault Buffer Allocation with No Service-policy Applied.If a specific queue does not use the buffers, these are not available for other queues. Hard Buffers: These are the minimum reserved buffers for specific queues. ![]() ![]() To get around that type of limitation, Catalyst 3650/3850 platform uses Hard buffers and Soft buffers. This is inefficient and can deplete the number of buffers needed to handle frames for all queues. Traditionally, buffers are statically allocated for each queue, and as you increase the number of queues the amount of reserved buffers decreases. It is recommended to run 03.06 or 03.07's latest version to get appropriate buffer allocations due to some known bugs in older codes. You can get some cushion if you tune the buffers but it cannot guarantee a zero output drop scenario. Interface buffers are a limited resource and can only absorb a burst up to a point after which packets can drop. Output drops are generally a result of interface over-subscription caused by many to one or a 10gig to 1gig transfer. If your network is live, ensure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. Use this guide for 3850 on 16.x.x or later IOS XE versions. This document is Catalyst 9000 Series, but shares the same ASIC as the 3850. Note: 16.x.x and later QoS CLI command changes are documented in this guide Troubleshoot Output Drops on Catalyst 9000 Switches. ![]()
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