Cisco Bug: CSCvs94319 - Ｗhen use NAT,the packet send to Multicast address will be added additional 12bytes.
Jun 22, 2020
- Cisco Catalyst 6000 Series Switches
Known Affected Releases
Symptom: H/W: WS-C6504-E S/W: 15.5(1)SY4 If PIM and NAT is configured on the same interface then multicast packets might be punted to CPU and forwarded in software switched path If these multicast frames are small [between 64B and 76B] then these packets will be padded to 76B Therefor incoming 64B frame will have extra 12B padding added and will leave the device as 76B frame Conditions: ip nat [inside|outside] is configured on the interface ip pim [sparse-mode|dense-mode|sparse-dense-mode] is configured on the same interface multicast data traffic arriving on such an interface
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