Cisco Bug: CSCtb79351 - Egress QoS on ChOC12 SPA drops priority traffic incorrectly
Jan 28, 2017
- Cisco 12000 Series Routers
Known Affected Releases
Symptom: Egress QoS on the ChOC12 SPA, configured with multilink PPP, in a SIP-601, in a 12000 series chassis may not correctly drop traffic when an interface is oversubscribed. As an example, in a multilink bundle with 2 T1s is configured on the spa. The cumulative bandwidth of the interface is ~3.088 Mbps. 2 traffic streams are sent out of the spa. 1 high priority stream - 2.4 Mbps 1 low priority stream - 2.4 Mbps The expectation is all 2.4 Mbps hi prio traffic should go through and about 0.6 Mbps of low priority traffic should pass. But we see hi priority - 1.6 Mbps and low priority - 1.6 Mbps. This issue is not seen on a regular T1 serial interface on the same SPA. This issue is also seen on Viking. Conditions: Interface oversubscription.
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