Какая максимальная длина igmpv2? Лишние 2 байта VSS-Monitoring ethernet trailer?

Question

[Михаил]

Добрый день.
Подскажите получатель igmp джоинта (cisco), не понимать\дропать пакет, из за лишних байтов?

Frame 542: 66 bytes on wire (528 bits), 66 bytes captured (528 bits) on interface 0
Interface id: 0 (\Device\NPF_{DBA588C3-ED49-470B-AD6B-838AC491F2C4})
Encapsulation type: Ethernet (1)
Arrival Time: Aug 18, 2017 10:45:19.461401000 RTZ 2 (����)
[Time shift for this packet: 0.000000000 seconds]
Epoch Time: 1503042319.461401000 seconds
[Time delta from previous captured frame: 0.180545000 seconds]
[Time delta from previous displayed frame: 28.995750000 seconds]
[Time since reference or first frame: 165.518188000 seconds]
Frame Number: 542
Frame Length: 66 bytes (528 bits)
Capture Length: 66 bytes (528 bits)
[Frame is marked: False]
[Frame is ignored: False]
[Protocols in frame: eth:ethertype:ip:igmp:igmp:vssmonitoring]
[Coloring Rule Name: Routing]
[Coloring Rule String: hsrp || eigrp || ospf || bgp || cdp || vrrp || carp || gvrp || igmp || ismp]
Ethernet II, Src: Zhongxin_9c:7f:9a (00:d0:d0:9c:7f:9a), Dst: IPv4mcast_00 (01:00:5e:00:00:00)
Destination: IPv4mcast_00 (01:00:5e:00:00:00)
Address: IPv4mcast_00 (01:00:5e:00:00:00)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
.... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
Source: Zhongxin_9c:7f:9a (00:d0:d0:9c:7f:9a)
Address: Zhongxin_9c:7f:9a (00:d0:d0:9c:7f:9a)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
Type: IPv4 (0x0800)
Padding: 0000000000000000000000000000
Internet Protocol Version 4, Src: 192.168.2.14, Dst: 225.0.0.0
Internet Group Management Protocol
[IGMP Version: 2]
Type: Membership Report (0x16)
Max Resp Time: 0.0 sec (0x00)
Header checksum: 0x08ff [correct]
Multicast Address: 225.0.0.0
VSS-Monitoring ethernet trailer, Source Port: 0
Src Port: 0