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Slot reboot on BD8K due to Async Queue growing with CustomType 42 messages

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TitleSlot reboot on BD8K due to Async Queue growing with CustomType 42 messages
Symptoms
  • IPARP dynamic entries have reach maximum default (8192) size and there are pending entries.
-> show iparp 0.0.0.0                       
Dynamic Entries  :        8192             Static Entries            :          0
Pending Entries  :          10
In Request       :   779164479             In Response               :  330759766
Out Request      :   384991566             Out Response              :  310592387
Failed Requests  :     9035043
Proxy Answered   :   310588656
Rx Error         :           0             Dup IP Addr               :    x.x.x.x
Rejected Count   :    98129646             Rejected IP               :   x.x.x.x
Rejected Port    :        8:14             Rejected I/F              : Vlan-x
Max ARP entries  :        8192             Max ARP pending entries   :        256
  • I/O modules continuously rebooting with Async Queue messages showing the customType details
<Erro:Kern.Card.Error> Slot-8: async queue is growing (400019) type is 17481770, customType is 42
<Erro:Kern.Card.Error> Slot-7: async queue is growing (400055) type is 12435498, customType is 42
  • IPv4 Multicast hardware L3 table full messages are logging every hour
<Warn:Kern.IPv4Mc.Warning> Slot-7: IPv4 multicast entry not added.  Hardware L3 Table full. (Logged at most once per hour.)
<Warn:Kern.IPv4Mc.Warning> Slot-8: IPv4 multicast entry not added.  Hardware L3 Table full. (Logged at most once per hour.)
  • iproute reserved-entries statistics show high number of IPv4 multicast entries
-> show iproute reserved-entries statistics
                       |-----In HW Route Table----|   |--In HW L3 Hash Table--|
                       # Used Routes   # IPv4 Hosts   IPv4   IPv4   IPv6  IPv4
Slot  Type              IPv4   IPv6    Local Remote   Local  Rem.   Loc.  MCast
----  ---------------- ------ ------  ------ ------   -----  -----  ----  -----
1     8900-10G8X-xl       369      0    8192      0       0      0     0   5698
2     8900-10G8X-xl       369      0    8192      0       0      0     0   5698
3                           -      -       -      -       -      -     -      -
4                           -      -       -      -       -      -     -      -
5                           -      -       -      -       -      -     -      -
6                           -      -       -      -       -      -     -      -
7     8900-10G24X-c       369      0    5167      0    3019      0     0   5007
 
8     8900-10G24X-c       369      0    5229      0    2941      0     0   5097
9     8900-10G24X-c       369      0    5199      0    2985      0     0   5028
10                          -      -       -      -       -      -     -      -
Environment
  • Black Diamond 8800/8900
  • EXOS 15.x
  • IPARP
Cause
Large number of MAC moves will trigger FDB flush and IPARP re-learning. During the re-learning process, pending ARP entries could cause async queue to grow and I/O module could experience a reboot as a result.
Resolution
Module reboot will stop by increasing the IPARP table size, by changing the multicast learning mode from (S,G,V) to (*,G,V), and by allocating more reserved entries for impacted slots.
  • Increase IPARP table size [ configure iparp max-entries <double the default size> ]
  • Reduce the multicast table size by changing the multicast learning mode  [ configure igmp snooping forwarding-mode group-vlan ]
  • Allocate more space from HW IP ROUTE table for IPARP or Host entries  [ configure iproute reserved-entries <num-of-routes> slot <slot-no> ]
Additional notes
It is important to note that multicast learning mode should only be changed when there is no L3 multicast (PIM) configured on the switch. Changing the learning mode from (S,G,V) to (*,G,V) is recommended only with L2 multicast traffic.

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