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616 | Multicast Source Discovery Protocol
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Figure 28-1. Multicast Source Discovery Protocol
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 28-2. MSDP SA Message Format
Implementation Information
• The FTOS implementation of MSDP is in accordance with RFC 3618 and Anycast RP is in accordance
with RFC 3446.
AS X
AS Y
RP1
RP
R1
R2
R3
R4
1/1
1/21
2/11
3/21
3/41
4/31
4/1
1/2
PC 1
Receiver
PC 3
Receiver
2/1
PC 2
Source
O
S
P
F
Area 0
O
S
P
F
Area 0
+
P
I
M
+
I
G
M
P
+
P
I
M
+
I
G
M
P
M
S
D
P
P
e
e
r
s
h
i
p
B
G
P
Source Port
Seq. Number
Dest. Port
(639)
Type
Length
Entry Count
RP Address
MSDP 00
1
Reserved
Sprefix Length
(/32)
Group Address
Source Address
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
Ack. Number
Offset
Reserved
Flags
Window
Checksum
Options Data
Urgent