Jun
26
The goal of this article is to discuss how would the following configuration work in the 3560 series switches: interface FastEthernet0/13 switchport mode access load-interval 30 speed 10 srr-queue bandwidth shape 50 0 0 0 srr-queue bandwidth share 33 33 33 1 srr-queue bandwidth limit 20 Before we begin, let’s recap what we know so far about the 3560 egress queuing: 1) When SRR scheduler is configured in shared mode, bandwidth allocated to each queue is based on relative weight. E.g. when... Read More
Mar
03
The 3560 QoS processing model is tightly coupled with it’s hardware architecture borrowed from the 3750 series switches. The most notable feature is the internal switch ring, which is used for the switch stacking purpose. Packets entering a 3560/3750 switch are queued and serviced twice: first on the ingress, before they are put on the internal ring, and second on the egress port, where they have been delivered by the internal ring switching. In short, the process looks as follows:... Read More

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