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Cisco Bug: CSCup06023 - u6route-mem allocation failure even though there is plenty of headroom

Last Modified

Feb 12, 2018

Products (8)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7700 6-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch

Known Affected Releases

6.2(8) 6.2(8a)

Description (partial)

running into u6route mem allocation failure even though there's plenty of memory left. 
 
e.g. A-VDC1# sh vdc resource u6route-mem detai
 
  u6route-mem          6 used   134 unused    202 free     68 avail    208 total
-------------
          Vdc                              Min       Max       Used      Unused    Avail
          ---                              ---       ---       ----      ------    -----
          AB-VDC1                       24        24        1         23        23
          A-1-B-VDC1                    100       100       1         99        99
          Test-VDC3                        4         4         1         3         3
          Test-VDC4                        4         4         1         3         3
          Test-VDC5                        4         4         1         3         3
          Test-VDC6                        4         4         1         3         3

Symptom:
A-1-B-VDC1# sh log last 10

get warning messages with failure to allocate shared memory:

Failed to allocate shared memory for route trie node

2014 May 27 17:59:33 A-1-B-VDC1 %U6RIB-2-NOSMEM:  u6rib [9610] (default-base)
Failed to allocate shared memory for recursive nexthop trie node
2014 May 27 17:59:43 A-1-B-VDC1 %U6RIB-4-SYSLOG_SL_MSG_WARNING: U6RIB-2-NOSME
M: message repeated 30671 times in last 121 sec
2014 May 27 18:00:23 A-1-B-VDC1 %BGP-5-ADJCHANGE:  bgp-64896 [9979] (default)
neighbor cafe:1890:e000:1::10 Down - holdtimer expired error
2014 May 27 18:00:26 A-1-B-VDC1 %U6RIB-2-NOSMEM:  u6rib [9610] (default-base)
Failed to allocate shared memory for route trie node
2014 May 27 18:00:36 A-1-B-VDC1 %U6RIB-4-SYSLOG_SL_MSG_WARNING: U6RIB-2-NOSME
M: message repeated 14688 times in st 52 sec
A-1-B-VDC1#

Conditions:
Verified with scale with 30k ipv6 and 655K ipv4 routes.
and with a hard swithover
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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