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Cisco Bug: CSCum31127 - PIM/IGMP: MTS buffers become full when high IGMP/PIM traffic rate received by device

Last Modified

Oct 30, 2020

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

6.1(2)I1(1.123) 6.1(2)I2(0.177)

Description (partial)

Symptom:
When a large rate of PIM Hello packets are received by a PIM/IGMP-enabled Nexus device, the MTS buffers of the IGMP process become exhausted. As a result, syslogs similar to the following can be seen:

2013 Dec 28 17:47:26.993 sys04-eor1 %$ VDC-1 %$ 28 17:47:26 %KERN-2-SYSTEM_MSG: [19937.228998] mts_acquire_q_space()  failing - no space in sap 312, uuid 0 send_opc 38916, pid 5494, proc_name netstack:pm-dbr - kernel
2013 Dec 28 17:47:26.993 sys04-eor1 %$ VDC-1 %$ 28 17:47:26 %KERN-2-SYSTEM_MSG: [19937.229028] node=4 sap=312 rq=419218(82166730) lq=0(0) pq=0(0) nq=116(22736) sq=0(0) buf_in_transit=306, bytes_in_transit=7791848 - kernel

Conditions:
1. This issue affects all Nexus platforms with the IGMP or PIM features enabled.
2. A high traffic rate of IGMP/PIM traffic is received by the device.
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