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Cisco Bug: CSCte19236 - CAS echoes HSRP and multicast traffic from network causing instability

Last Modified

Feb 22, 2014

Products (1)

  • Cisco NAC Appliance (Clean Access)

Known Affected Releases


Description (partial)


Plugging in a CAS (even just the trusted eth0 interface) causes the CAS to echo HSRP and other multicast traffic. The switch may show the message below:

*Jan  6 15:43:52.643: %HSRP-4-DUPADDR: Duplicate address on Vlan243, sourced by 0021.5ec6.b3bc

(That message was seen on a 6500 running 12.2(33)SXH5 but not seen on 12.2(33)SXI3 even though the CAS behavior remains the same).

This can cause routing instability to and from that network.


This has only been observed on the 33x5 series hardware (known to occur on the 3355).
It has only been observed on 4.7.x CAS software (33x5 will not run earlier software).

As mentioned above the switch errors about duplicate IPs may not show on all switch IOS versions, but the issue itself as well as potential network instability, should occur on all IOS versions.
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