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Cisco Bug: CSCta33569 - Removing 'ip multicast boundary' causes high CPU utilization

Last Modified

Jan 31, 2017

Products (1)

  • Cisco IOS

Known Affected Releases

12.2(31)SB14 12.2(33)SB5

Description (partial)


A router may experience high CPU utilization due to VTEMPLATE Backgr:

Router#show proc cpu sort
CPU utilization for five seconds: 99%/29%; one minute: 99%; five minutes: 99%
 PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
 301     7915968     35782     221227 63.38% 64.50% 64.49%   0 VTEMPLATE Backgr

When removing <CmdBold>ip multicast boundary<noCmdBold> from a large number of virtual
interfaces (like <CmdBold>interface virtual-template<noCmdBold>).

Seen when there are a large number of cloned interfaces.
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