H3C Technologies H3C S7500E Series Switches - Manual (Page 360)

13-9
Table 13-1 Values in the hashing algorithm
Value Description
Value Hash value
G
The digest from the exclusive-or (XOR) operation between the 32-bit segments of
the IPv6 multicast group address. For example, if the IPv6 multicast address is
FF0E:C20:1A3:63::101, G = 0xFF0E0C20 XOR 0x01A30063 XOR 0x00000000
XOR 0x00000101
M Hash mask length
C
i
The digest from the exclusive-or (XOR) operation between the 32-bit segments of
the C-RP IPv6 address. For example, if the IPv6 address of the C-RP is
3FFE:B00:C18:1::10, C
i
= 0x3FFE0B00 XOR 0x0C180001 XOR 0x00000000 XOR
0x00000010
& Logical operator of “and”
XOR Logical operator of “exclusive-or”
mod Modulo operator, which gives the remainder of an integer division
Embedded RP
The Embedded RP mechanism allows a router to resolve the RP address from an IPv6
multicast address so that the IPv6 multicast group is mapped to an RP, which can take the
place of the statically configured RP or the RP dynamically calculated based on the BSR
mechanism. The DR does not need to know the RP address beforehand. The specific process
is as follows.
z At the receiver side:
1) A receiver host initiates an MLD report to announce its joining an IPv6 multicast group.
2) Upon receiving the MLD report, the receiver-side DR resolves the RP address embedded in
the IPv6 multicast address, and sends a join message to the RP.
z At the IPv6 multicast source side:
The IPv6 multicast source sends IPv6 multicast traffic to the IPv6 multicast group.
3) The source-side DR resolves the RP address embedded in the IPv6 multicast address, and
sends a register message to the RP.