I'm trying to adjust the TX-ring limit on a vbr-nrt vc 20Mbit/s. We are using fancy queuing with RED enabled in the default class. We also run a voice class so we want to keep jitter and and delay to a minimum.
When I use a TX-ring limit of 12 for example, the drop rate in the class-default is somewhere around 30-200kbit/s, is this normal ?
I've been trying to find a best practice for the TX-ring setting but the Cisco documentation just says "small to keep delay down, but large enough not to affect throughput".
Is a TX-ring limit of 12 to low for a VC at this speed ?
you should not set TX limit unless directed by the TAC or as corrective action to a know problem. In particular, every time you have QoS in form of LLQ, the TX limit should automatically be set to 1, as this will allow IOS software to have best control on queueing on the interface or VC. Any higher value would in fact defeat the purpose of a priority queue.
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