mLDP In-Band MVPN Control Messages
The key mechanism of mLDP in-band MVPN is the transmission of PIM-SM/SSM Join messages using mLDP signaling. (S, G) entries in C-multicast PIM Join messages are carried in the Opaque value in mLDP P2MP Label Mapping messages and forwarded over mLDP P2MP tunnels. Figure 1 shows the format of the Opaque value.
Field |
Length |
Description |
|---|---|---|
Route type |
1 octet |
Route type. The value is 250. |
Length |
2 octets |
Length of the Opaque value. The value of this field is 16. The Opaque value consists of a source, a group, and an RD. |
Source |
4 octets |
Multicast source address. |
Group |
4 octets |
Multicast group IP address. |
RD |
8 octets |
Route distinguisher. |