Known Limitations
Learn about limitations in this release for PTX Series routers.
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General Routing
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When the low priority queue is oversubscribed, we may see a page timeout error under following conditions. The reason for this is detailed below . 1. If a queue is configured with shared buffer configuration we allocate interface equivalent of buffers to that queue. 2. When traffic in such queue is moving very slow or starved for a longer duration due to strict-priority-scheduling the PE ASIC marks pages staying long as Timed out. 3. Current Page time out value is ~3.5 to 7 Sec. 4. Such time out packet when reached Head of the queue will all get dropped leading to page time out count increase. 5. Since shared buffer config leads to large queue size, and if the queue is moving very slowly, we never hit queue full if the input to such slow-moving queue is very less. 6. This is what being tested in this particular senario. 7. When that happen we will only see Page timeout and no Queue TAIL Drops. PR1581490