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Cisco Bug: CSCsg38930 - 7600 SPA-IPSEC-2G - Multicast data is not forwarded through GRE Tunnel

Last Modified

Jan 24, 2017

Products (1)

  • Cisco IOS

Known Affected Releases

12.2(18)SXF5

Description (partial)

Symptoms: IP fragments may not be forwarded over an GRE tunnel when the 
tunnel is configured to go through an IPSEC-SPA-2G. These IP fragments may be 
dropped.

Conditions: This symptom is observed on a Cisco 7600 series that has a 
Supervisor Engine 720 and an IPSEC-SPA-2G, and that runs Cisco IOS Release
12.2(18)SXF5 when the tunnel is configured in the following manner:

- Path MTU Discovery (PMTUD) is enabled.

- IPsec tunnel protection is enabled.

- The <CmdBold>crypto engine slot<noCmdBold> <CmdArg>slot/subslot<noCmdArg> 
<CmdBold>inside<noCmdBold> command is enabled.

The symptom may also affect other releases. 

The output of the <CmdBold>show crypto vlan<noCmdBold> command shows the VLAN 
that is associated with the crypto configuration.
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  • Status
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