Dell Force10 Z9000 Configuration Manual page 564

Figure 26-1. Multicast Source Discovery Protocol
AS X
Area 0
1/2
R1
PC 1
Receiver
RPs advertise each (S,G) in its domain in Type, Length, Value (TLV) format. The total number of TLVs
contained in the SA is indicated in the "Entry Count" field. SA messages are transmitted every 60 seconds,
and immediately when a new source is detected.
Figure 26-2. MSDP SA Message Format
Source Port
| Multicast Source Discovery Protocol (MSDP)
564
PC 2
Source
2/1
R2
2/11
1/21
RP1
1/1
Seq. Number Ack. Number
Dest. Port
(639)
Length
Type
Code: 1: IPv4 Source-active
2: IPv4 Source-active Request
3: IPv4 Souce-active Response
4: Keepalive
5: Reserved
6: MSDP traceroute in progress
7: MSDP traceroute reply
PC 3
Receiver
3/21
3/41
R3
RP
Reserved Flags Window
Offset
Entry Count Reserved Sprefix Length
RP Address
4/1
R4
4/31
Checksum Urgent
Options
Group Address Source Address
(/32)
AS Y
Area 0
Data
MSDP 001