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Spirent KB Article
Doc ID: FAQ14621
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Spirent TestCenter: STC generates IPv6 multicast stream with destination MAC address same as OSPFv3 MAC address
IPv6 Multicast Stream generation
When trying to generate IPv6 multicast stream, STC will automatically map the IPv6 multicast address to MAC address.
Example: IPv6 Multicast address ff1e:190::5 or ff1e:190::6, STC will generate MAC address as: 33:33:00:00:00:05 and 33:33:00:00:00:06, which is same as OSPFv3 MAC address defined by IETF.
This may confuse customer, suspecting STC is doing this incorrectly.
According to the IPv6 Multicast address to MAC address mapping procedure, STC is actually correct.
4.3 Dynamic IPv6 Multicast Addresses
Dynamic IPv6 multicast addresses can be allocated by an allocation server or by an end-host. Regardless of the allocation mechanism, all dynamically allocated IPv6 multicast addresses MUST have the T bit set to 1. This will distinguish the dynamically allocated addresses from the permanently assigned multicast addresses, defined in [RFC 2375], at the link-layer on any media that maps the lower portion of the IPv6 multicast address into a link-layer address. It should be noted that the high-order bit of the Group ID will be the same value as the T flag. As an example, the permanent IPv6 multicast address FF02::9 maps to an Ethernet group address of 33-33-00-00-00-09. A dynamically allocated IPv6 multicast address of FF32::8000:9 would map to the Ethernet group address 33-33-80-00-00-09.
Product : Multicast