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Catalyst 4500 Series Switch Cisco IOS System Message Guide
OL-13091-01
Chapter 2 Messages and Recovery Procedures
DHCP SNOOPING Messages
Error Message C4K_COMMONSTUBMAN-4-FAILEDTOSENDLOOPBACKTRIES: [char] port [dec]
failed to send packet in [dec] tries
Explanation
An ASIC in slot [char] was unable to send a loopback packet on port [dec] and this is
the [dec]th time it tried to send and failed. This suggests that the switch is out of memory. The
software will attempt to send a loopback packet only three times.
Recommended Action Contact your technical support representative.
Error Message C4K_COMMONSTUBMAN-4-UNEXPECTEDLOOPBACK: [char] sent out a loopback
packet on port [dec], but it came back on port [dec]
Explanation
The ASIC diagnostics for slot [char] sent a loopback packet out port [dec] and it came
back on another port [dec]. This is unexpected because the loopback is done within the hardware.
Recommended Action Contact your technical support representative.
C4K_COMMONSTUBMAN-7
Error Message C4K_COMMONSTUBMAN-7-LOSTPACKET: [char] port [dec] lost a packet
Explanation
A loopback packet was lost during online diagnostics of an ASIC in slot [char].
Recommended Action This is an informational message only. No action is required.
DHCP SNOOPING Messages
This section contains the DHCP snooping (DHCP_SNOOPING) messages.
DHCP_SNOOPING-3
Error Message DHCP_SNOOPING-3-DHCP_SNOOPING_INTERNAL_ERROR: DHCP Snooping internal
error [char]
Explanation A software sanity check failed in the DHCP snooping process. This message may also
show up if the system is running out of memory or resources.
Recommended Action Please reduce resource consumption by disabling features, ports, or packets
destined to software. If the condition persists, please call Cisco technical support.
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