02_4_2_组播PIM-SM_详细图解

2019年7月27日 01:30 作者：金淼淋分类：Multicast  550

YES LAB
PIM Sparse Mode Details

Objectives
YES LAB
Upon completion of this section you will be
able to:
— Describe the control messages in PIM SM and their
significance in building distribution trees
— Read the multicast forwaiding table anå identify
the flags and timers associated with various
multicast states
— Explain the maintenance of a PIM SM
distribution tree

PIM State
YES LAB
— Represented bv entries in the multicast routing (mroute) table
• Usecfio maké muitlcast traffic forwarding decisions
• Composed of (* G) and (S, G) entries
• Each entry contains RPF information
— Incoming (i.e. RPF) interface
— RPF Neighbor (upstream)«-
• Each entry contains an Outgoing Interface List (OIL)
— OIL may be NULL +

PIM SM State Flags
YES LAB
• S = Sparse Mode
• C = Directly Connected Host
• L = Local (Router is member)
• P = Pruned (All intfcs in OIL = Prune)
• T = Forwarding via SPT
— Indicates at least one packet was forwarded

•
•
PIM SM Joining
YES LAB
Leaf routers send a ( * G) Join toward RP
— Joins sent hop-by-hop along path toward RP
Each router along path creates ( * , G) state
— IF no (*, G) state,
• Create it and send a Join toward RP.
- ELSE
• Join process complete. Reached the shared tree.

PIM SM Joining
TO RP (10.1.5.1)
Shared Tree
MP Join
Rcvr A
so
10.1.4.2
10.1.2.2
YES LAB
rtr-a
10.1.2.1
rtr-b
O Rcvr A wants to receive group G traffic. Sends IGMP Join for G.

PIM SM Joining
YES LAB
To RP (10.1.5.1)
Shared Tree
so
1014.2
10.1.2.2
rtr-a
10.1.2.i
rtr-b
Rcvr A
e, 224-1, 1.1), 10.1.5.1,
interface: Ethernet0, nbt
Outmoing interface U 3t:
'fit. hernot.l, Forwar•d/fiparsn,
rtr b creates (8, 224.1.1.1) state
O RcvrA wants to receive group G traffic. Sends IGMP Join for G.

PIM SM Joining
TO RP (10.1.5.1)
so
10.1/1.2
Shared Tree
10.1.2.2
Rcvr A
YES LAB
rtr-a
10.1.2.1
PIM join
rtr-b
Rcvr A wants to receive group G traffic. Sends IGMP Join for G.
rtr-b sends ( • , G) Join toward RP.

PIM SM Joining
YES LAB
TO RP (10.1.5.1)
Shared Tree
Rcvr A
rtr-a
10. .2
10.1.2.
10.1.2.2
e, 224.1. i. i), 00:00: 10.1.5.1, flap:
I noonting inter fate: seria10, nbr 10. l. d. I
outgoing interface liat:
EthernetO, Forward/ Spat",
rtr-a creates ( * , 224.1.1.1) state.
Rcvr A wants to receive group G traffic. Sends IGMP Join for G.
O rtr-b
G oin toward RP.

PIM SM Joining
TO RP (10.1.5.1)
so
PIM Join
Sh ared Tree
Rcvr A
10.1.4.2
10.1.2.2
YES LAB
rtr-a
10.1.2.1
rtr-b
RcvrA wants to receive group G traffic. Sends IGMP Join for G.
rtr-b sends (*, G) Join toward RP.
rtr-a sends ( * , G) Join toward RP.

PIM SM Joining
TO RP (10.1.5.1)
Sh ared Tree
Shared Tree
so
10.1.4.2
10.1.2.2
YES LAB
rtr-a
10.1.2.1
rtr-b
Rcvr A
Rcvr A wants to receive group G traffic. Sends IGMP Join for G.
rtr-b sends (*, G) Join toward RP.
rtr-a sends * , G) oin toward RP.
Shared tree is built all the way back to the RP.

PIM SM Registering
Receiver Joins First
rtr b
Shared Tree
224.1.1.1), RP 1/1. 6B.20.140,
Tncominq int.er•lace: Null, "br 0.0. 0.0,
Out.qoinq int.er'lace I i st.:
fierialO, Forward/fiparse,
Serial 1, Forward/fiparse,
YES LAB
Rp
rtr-c
State in RP before any source registers (receivers on shared tree); empty states for
group 224.1.1.1 in rtr-a and rtr-b

PIM SM Registering
(171.".3/.121, 22'1.1.1.1)
Mast Packets
YES LAB
RP
Source
171.68.37.121
rtr-a
rtr-b
Shared Tree
Source begins sending group G traffic.

PIM SM Registering
(171.68.37.i2i, 224.1.1.1)
Mcast Packets
Source
171.68.37.121
rtr-a
Register Msgs
Join
rtrQ)
Shared Tree
YES LAB
rtr-c
(A , 224.1.1.1)
Mcast Traffic
O RP sends (S, G) Join toward Source to build SPT.

PIM SM Registering
Receiver Joins First
(171.68.37.121, 224.1.1.1)
Mcast Packets
Source
171.68.37.121
rtr-a
Register Msgs
rtA)
Shared Tree
YES LAB
rtr •c
, 224.1.1.1)
Mcast Traffic
RP begins receiving (S, G) traffic down SPT.

PIM SM Registering
Receiver Joins First
YES LAB
(171.68.37.121, 224.1.1.1)
Mcast Packets
Source
171.68.37.121
_____RÅZ
Register Ms
rtr •b
o
Register-Stop
rtr •c
so
, 224.1.1.1)
Mcast Traffic
Shared Tree
RP begins receiving (S, G) traffic dow SPT.
RP sends Register-Stop to rtr-a.

YES LAB
z)
PIM SM Registering
Source Starts First
so
rtr b
It: c>5how mzoute 224.1.1. I
Croup 224.1. i. i not found.
rtr-c
Empty state in RP before any source registers (no receivers on shared tree); empty
states for group 224.1.1.1 in rtr-a and rtr-b also.

PIM SM Registering
Source Starts First
(171.".3/.121, 22'1.1.1.1)
Mast Packets
Source
171.68.37.121
rtr-a
YES LAB
rtrx
rtf-b
Source begins sending Group G traffic.

PIM SM Registering
Source Starts First
YES LAB
(171.68.37.121, 224.1.1.1)
Mcast Packets
Source
171.68.•37.121
rtr•a
Register Msgs
rtr•b
Register-Stop
rtr-c
rtr-c (RP) has no receivers on shared tree; discards packet.
O RP sends Register-Stop to rtr-a.

PIM SM Registering
Source Starts First
(171.68.37.121, 224.1.1.1)
Mcast Packets
YES LAB
Source
171.68.•37.121
rtr•a
rtr-b
rtr-c
rtr-c (RP) has no receivers on shared tree; discards packet.
O RP sends Register-Stop to rtr-a.
O rtr-a stops encapsulating traffic in Register Me ( C , 6 )
drops packets from Source.

PIM SM Registering
Source Starts First
(171.68.37.121, 224.1.1.1)
Mcast Packets
Source
171.68.37.121
rtr-a
Receivers begin joining the Shared Tree
rtri
YES LAB
Join
RP (rtr-c) receives ( • , G) Join from a receiver on shared tree.

PIM SM Registering
Source Starts First
(171.68.37.121, 224.1.1.1)
Mcast Packets
Source
171.68.37.i21
rtr•i
YES LAB
rtr-c
rtr-b
e, 224.1.1. i), 171.68.28.1",
interface: Seri alt, r.Et
(Outgoing interface lift: Null
(171.0. 37.121/32, 224.1.1.1), flap:
inl.erf nee: nbr 0.0. 0.0, keg isl•ering
0111.90 ing inl•erf lisl•:
YfT7io, rorward/fiparso,
rtr-a processes the (S, G) Join; adds SerialO to OIL

PIM SM Registering
Receivers Along the SPT
(171.68.37.121, 224.1.1.1)
Mast Packets
Source
171.68.37.121
rtr-a
YES LAB
rtr•c
(A , 224.i.i.i)
Mcast Traffic
e, 224. i. i. i), 171.$8.28.140, su
interface: Serial i, 17i.f33.28.idO,
outgoing interface ii:gt: Null
(171.0. 37.121/32, 224.1. 1.1), flap: T
771. 6B. 2B. '190
Out•going list' :
fierinll, rorwnr•d/fiparse, 00: ()4: : 32
Current state in rtr-b

PIM SM Registering
Receivers Along the SPT
(171.68.37.121, 224.1.1.1)
Mcast Packets
Source
171.68.37.121
rtr•a
rtr-b
rtrc
flag: : S
YES LAB
224.1.1.1)
Mast Traffic
e, 224.1.1.1), 171.".28.110,
interface: Null, rib: 0.0.0.0,
Outgoing interface
Serial i, Earvat.:l/Sparze,
224.7.1.1, [lags:
in fieroa13, . 8B. 2B .1",
inl.erVac:e li st.:
00:00:
Current state in the RP

PIM SM Registering
Receivers Along the SPT
(171.68.37.121, 224.1.1.1)
Mcast Packets
Source
171.68.37.121
rtr-a
rtf -c
rtr-b
IGMPJoin
Rcvr A
YES LAB
(A, 224.1.1.1)
Mcast Traffic
Rcvr A wants to receive Group G traffic. Sends IGMP Join for G.

PIM SM Registering
Receivers Alon
(171.68.37.121, 224.1.1.1)
Mcast Packets
Source
1/1.68.3/.121
rtf-a
rtr b
the SPT
rtr-c
r, G) Join
YES LAB
(X , 224.1.1.1)
Mcast Iraffic
O rtr-b triggers a ( * , G) Join to join the shared tree

PIM SM Registering
Receivers Alon the SPT
(1/1.68.]/.121, "4.1.1.1)
Packets
Source
1/1.68.3/.121
rtr b
Rcvr A
Group G traffic begins to flow to Rcvr A.
(Note: 171.68.37.121 traffic doesn't flow to RP then back down to rtr-b)
rtr-C
YES LAB
(•,na.l.l.l)
Mcast Traffic

PIM SM SPT Switchover (cont«—
• SPT Switchover Mechanism
• Once each second
• Compute new ( * , G) traffic rate
• If threshold exceeded, set "J" flag in ( * , G)
• For next multicast packet received:e
• If "J" flag set in ( * , G)
— Join SPT for (Si, G) +-
— Mark (Si, G) entry with "J" flage
— Clear "J" flag in (*, G)

PIM SM
rtr-c
To RP (10.1.5.1)
so
so
rtr-d
SPT Switchover
so
10.1.4.2
1012.2
10.1.2.1
rtr-b
YES LAB
To Source "S/'
(S i G) Traffic How
Shared (RPT) Tree
Rcvr A
RcvrB
2'24.1.1.1),
T neominq fior•inT0,
Oilt•qoinq Tixt•:
fie rial 1, 0(): ()1:
fierial?.,
10.1. h. 1,
32/00 02: '28
State in rtr-c before switch; similar state on rtr-a also

To RP (10.1.5.1)
PIM SM
rtr-c
10.1.4.1
rtr-d
SPT Switchover
YES LAB
rtr-a
so
10.1.4.2
10.1.2.2
10.1.2.1
rtr-b
[Tags:
To Source "S/'
G) TrafficHow
Shared (RPT) Tree
• spTTree
(t, 224. T. 1.1), 10.1. S 1
Tnc:orni ng int.er[aee: fierial(),
10.7.4.8,
ng lisl.:
1.0, rye ,
00:07
State in rtr-d before switch; similar state on rtr-b also

PIM
rtr-c
SPT Switchover
To RP (10.1.5.1)
so
10.1.a.i
YES LAB
To Source "S/'
rtr-a
so
so
rtr-d
(9, 224.1.1.1),
10.1.4.2
10.1.2.2
10.1.2.1
o
Group "G" rate > Threshold
rtr-b
TrafficFlow
Shared (RPT) Tree
• spTTree
10.1. S. 1,
Hags:
ng inl.erf ace: RPT? nor It) .1.2. 1
ng lisl.:
r,'.hernel.l, Forwar•d/fiparye, 00:
Group "G" rate exceeds SPT threshold at rtr-b

PIM SM SPT Switchover
rtr-c
To RP (10.1.5.1)
so
so
rtr-d
10.1/1.1
rtr-a
so
10.1.4.2
10.1.2.2
10
10.1.2.1
rtr-b
YES LAB
TO Source "S/'
G) Traffic Flow
Shared (RPT) Tree
Tree
13, 10.1. S. 1,
[ lags: J
10.1 . 2.1
,'.hernnl.7, 00:01
Group "G" rate exceeds SPT threshold at rtr-b
O Set J Flag in ( * , G) and wait for next (S •,G) packet

PIM SM
SPT Switchover
rtr-c
TO RP (10.1.5.1)
so
rtr-d
10.1/1.1
rtr-a
so
10.1.4.2
10.1.2.2
10.1.2.1
rtr-b
YES LAB
To Source "S/
(S 6 G) Traffic Flow
Shared (RPT) Tree
• spTTree
Rcvr A
Rcvr
(9, 224.1.1.7), 10.1. S. 1, t lags: J
T neorninq inLerf RPT' nor 10.1. '2. •1,
Oul•qoinq inl.er[ ace lisL:
F,l.hernel.l, Forward/ fiparse,
(S i, G) packet arrives down shared tree.

PIM SM SPT Switchover
rtr-c
TO RP (10.1.5.1)
10.1/1.1
rtr-a
so
10.142
10.1.2.2
so
rtr-d
Rcvr A
Rcvr
(t, 224.7.1.1),
10
10.1.2.1
rtr-b
YES LAB
To Source "S,"
(S 6 G) Traffic Flow
Shared (RPT) Tree
• SPT Tree
10.1. S. 1, t lags:
T neorninq nor 10. 1.2. •1,
0111.qoi4iq acte lisL:
ror•ward/fiparse, : 43/
O (S i, G) packet arrives down shared tree.
O Clear J Flag in the ( * , G) & create (Si, G) state.

PIM SM SPT Switchover
rtr-c
To RP (10.1.5.1)
so
rtr-d
10.1/1.1
rtr-a
so
10.1.4.2
10.1.2.2
10.1.2.i
o
(Sic,)
rtr-b
YES LAB
To Source "S/'
(S 6 G) Traffic Flow
Shared (RPT) Tree
SPT Tree
Rcvr A
Send (S f) Join towards S;.

PIM SM
rtr-c
SPT Switchover
To RP (10.1.5.1)
so
rtr-d
10.14.1
rtr-a
so
10.1.a.2
10.1.2.2
10. i.2.1
rtr-b
YES LAB
To Source "S:"
o
(Si,G) Join
(Si G) Traffic Flow
Shared (RPT) Tree
Tree
Rcvr A
Rcvr B
O rtr-a forwards (Si,G) Join toward Si.

PIM SM
rtr-c
SPT Switchover
To RP (10.1.5.1)
so
rtr-d
10.1.4.1
Prune
O rtr-a
so
i0.i.a.2
10. i.2.1
10.1.2.2
rtr-b
YES LAB
TO Source "S/
(Si G) Traffic Flow
Shared (RPT) Tree
Tree
Rcvr A
Rcvr B
O rtr-a forwards (Si,G) Join toward Si
SPT and RPT diverge, triggering (Si G) RP-bit Prunes toward RP.

PIM SM SPT Switchover
rtr-c
To RP (10.1.5.1)
10.1.4.1
rtr-a
so
.2
10.1.2.2
YES LAB
To Source "S t'
(SiG) Traffic
(s i G) Traffic How
Shared (RPT) Tree
rtr-d
Rcvr A
Rcvr B
O (Si, G) traffic begins flowing down SPT tree.
10.1.2.1
rtr-b

PIM SM
rtr-c
SPT Switchover
YES LAB
To RP (10.1.5.1)
so
rtr-d
10.1/1.1
Rcvr A
rtr-a
so
10.1.4.2
10.1.2.2
10.1.2.1
rtr-b
To Source "S/'
(S 6 G) Traffic How
Shared (RPT) Tree
SPTTree
O Unnecessary (S i, G) traffic is pruned from the shared tree.

To RP (10.1.5.1)
10
so
PIM SM
rtr-c
10.1.4.1
rtr-d
SPT Switchover
rtr-a
so
10.1.aa
10.1.2.2
10.1.2.1
rtr-b
YES LAB
TO Source "S/'
(Si G) Traffic Flow
Shared (RPT) Tree
SPT Tree
Rcvr A
Rcvr
Unnecessary (Si G) traffic is pruned from the shared tree.
(Si G) traffic still flows via other branches of the shared tree.

PIM SM SPT Switchover
• Shared Tree Switchback Mechanism
• Once each
• If J flag set in (Si, G) entry
— Compute new (Si, G) traffic rate
— If rate < SPT-threshold
• Rejoin (*, G) Tree for (Si, G) traffic
• Send (Si, G) prune up SPT toward S,
• Delete (Si, G) entry
YES LAB

PIMSM runin
YES LAB
1. IGMP group times out and last host sends Leave
2. Receive PIM pruning message
3. Cannot receive periodic PIM join
— Each router "prunes" interface
• IF all interfaces in "oilist" for ( * , G) are pruned;
THEN send Prune up shared tree toward RP
• Any (S, G) state allowed to time out

PIM SM Pruning
Shared Tree Case
YES LAB
To RP (10.1.5.1)
(Si G) Traffic Flow
Shared Tree
Rcvr A
so
10.1.4.2
10.1.2.2
rtr-a
10.1.2.1
rtr-b

PIM SM Pruning
Shared Tree Case
YES LAB
To RP (10.1.5.1)
(Si G) Traffic Flow
Shared Tree
Rcvr A
so
10.1.4.2
10.1.2.2
rtr-a
10.1.2.1
rtr-b
e, 221.1.1.1), n, 10.1.5.1, sc
interface: EthernetO, 10. i. 2.1,
Outgoing interface
Etherneti, Forwarcl/Spa:ze, 00:01: d
State in rtr-b before Pruning

PIM SM Pruning
Shared Tree Case
To RP (10.1.5.1)
(Si G) Traffic Flow
Shared Tree
SPT Tree
Rcvr A
so
10.1.4
10.1.2.2
YES LAB
rtr-a
10.
.1
rtr-b
(1, 224.1. 1.1), 10.1.5.1, fläF: S
Ir.:oming interface: SerialO, nbt 10.1.'1.1,
outgoing interface lizt:
EthernetO,
State in rtr-a before Pruning

PIM SM Pruning
Shared Tree Case
TORP (10.1.5.1)
(Si G) Traffic Flow
Shared Tree
SPTTree
IGMP1eave
Rcvr A
so
10.1.4.2
10.1.2.2
1
YES LAB
rtr-a
10.1.2.1
rtr-b
rtr-b is a Leaf router. Last host Rcvr A, leaves Group G.

PIM SM Pruning
Shared Tree Case
TO RP (10.1.5.1)
(Si G) Traffic Flow
shared Tree
SPT Tree
Rcvr
so
10.1.4.2
10.1.2.2
1
YES LAB
rtr-a
10.1.2.1
rtr-b
rtr-b is a Leaf router. Last host Rcvr A, leaves Group G.
O rtr-b removes El from (*, G) and any (Si, G) "oilists".

PIM SM Pruning
Shared Tree Case
TO RP (10.1.5.1)
(Si G) Traffic Flow
shared Tree
SPT Tree
Rcvr
so
10.1.4.2
10.1.2.2
YES LAB
rtr-a
10.1.2.1
(A, G) Prune
rtr-b
rtr-b is a Leaf router. Last host Rcvr A, leaves Group G.
O rtr-b removes El from * , G and any S • G) oilists".
rtr-b ( • , G) "oilist" now empty; sends ( * , G) Prune toward RP.

PIM SM Pruning
Shared Tree Case
YES LAB
To RP (10.1.5.1)
(Si G) Traffic Flow
Shared Tree
SPT Tree
so
10.1.2.2
rtr-a
10.1.2.1
rtr-b
O rtr-a receives Prune; removes EO from ( * , G) "oilist".
(After the 3-second Multiaccess network Prune Delay.)

PIM SM Pruning
Shared Tree Case
YES LAB
To RP (10.1.5.1)
(Si G) Traffic Flow
Shared Tree
SPT Tree
so
rune
10.1.4.2
10.1.2.2
rtr-a
10.1.2.1
rtr-b
O rtr-a receives Prune; removes EO from (*, G) "oilist".
(After the 3second Multiaccess networ rune Delay
O rtr-a (*, G) "oilist" now empty; send (*, G) Prune toward RP.

PIM SM Pruning
Shared Tree Case
YES LAB
To RP (10.1.5.1)
(Si G) Traffic Flow
Shared Tree
SPT Tree
so
10.1.4.2 •
10.1.2.2
rtr-a
10.1.2.1
rtr-b
O rtr-a receives Prune; removes EO from ( * , G) "oilist".
(After the 3second Multiaccess networ rune Delay
O rtr-a (*, G) "oilist" now empty; send (*, G) Prune toward RP.
Pruning continues back toward RP.

PIM SM Pruning
SPT Case
YES LAB
To Source
To RP (10.1.5.1)
(Si G) Traffic Flow
Shared Tree
SPT Tree
s
10.1
10.1.2.2
rtr-a
10.1.
rtr-b
10. 7.4.1,
Rcvr A
224.1.1.1), no.l.s.l, flags:
Tncorning fieri alt),
Onl.going inl.erl-at:e. lisl.:
r, l. he 1.0, rye,
(171.68.37.121/32, 22d.1.1.1),
interface: Serial l,
outgoing Interface
Ethernet0, E'twarcl/S ane,
flap:
State in rtr-a before Prunin

PIM SM Pruning
SPT Case
YES LAB
To Source "S/'
To RP (10.1.5.1)
(Si, G) Traffic How
Shared Tree
'GMP Leave
Rcvr A
so
10.1.4.2
10.1.2.2
rtr-a
10.1.2.1
rtr-b
rtr-b is a Leaf router. Last host Rcvr A, leaves Group G.

YES LAB
To Source "Si"
To RP (10.1.5.1)
(Si G) Traffic Flow
Shared Tree
Rcvr
PIM SM Pruning
SPT Case
so
rtr-a
10.1.4.2
10.1.2.1
10.1.2.2
rtr-b
rtr-b is a Leaf router. Last host Rcvr A, leaves Group G.
O rtr-b removes El from (*, G) and any (S i, G) "oilists".

PIM SM Pruning
SPT Case
YES LAB
To Source "S/'
To RP (10.1.5.1)
(Si, G) Traffic Flow
Shared Tree
sp•r T
Rcvr
so
10.1.4.2
10.1.2.2
rtr-a
10.1.2.1
Prune
rtr-b
rtr-b is a Leaf router. Last host Rcvr A, leaves Group G.
O rtr-b removes El fronf,)) and
rtr-b (8, G) "oilist" now empty; sends ( • , G) Prune toward RP.

PIM srvl Pruning
SPT Case
YES LAB
To Source
To RP (10.1.5.1)
(Si G) Traffic Flow
Shared Tree
SPT Tree
Rcvr A
so
10.1.4.2
10.1.2.2
rtr-a
10.1.2.1
Periodic
(S, G) Join
rtr-b
rtr-b is a Leaf router. Last host Rcvr A, leaves Group G.
O rtr-b removes El from ( * , G) and any (Si G) "oilists".
rtr-b ( * , G) "oilist" now empty; sends (*, G) Prune toward RP.
O rtr-b stops sending periodic (S, G) Joins.

PIM SM Pruning
SPT Case
YES LAB
To Source "S/'
To RP (10.1.5.1)
(Si G) Traffic Flow
Shared Tree
SPT Tr
so
10.1.4.2
10.1.2.2
rtr-a
10.1.2.1
rtr-b
rtr-a receives Prune; removes EO from ( * , G) and (S,G)"oi/ist" .
(After the 3-second multiaccess network Prune Delay.)

To RP (10.1.5.1)
(Si G) Traffic Flow
Shared Tree
SPT Tr
PIM SM Pruning
SPT Case
so
rtr-a
rune
10.1.4.2
0.1.2.1
10.1.2.2
rtr-b
YES LAB
To Source "S/'
rtr-a receives Prune; removes EO from (*, G) and (S,G)"oi/ist" .
(After the 3-second multiaccess network Prune Delay.)
O rtr-a (*, G) "oilist" now empty; sends ( * , G) Prune toward RP.

PIM SM Pruning
SPT Case
YES LAB
TO Source "S/'
To RP (10.1.5.1)
(Si G) Traffic Flow
Shared Tree
SPT Tree
so
10.1.4.2
10.1.2.2
rtr-a
10.1.2.1
_ rtr-b
e, 224.1.1.1), 00:02: 10.1.5.1, flag::
interface: Ethernet'), 10. i. 2.1,
Outgoing
interface
(171.838.37. 121/-72, 22d.1.1.1), flap:
T neorni ng
n r,l.hernol.o, 10.1. '2.
Ou 1.9 oi ng
in list. :
State in rtr-b after Pruning

PIM SM Pruning
SPT Case
YES LAB
To Source
TO RP (10.1.5.1)
(Si G) Traffic Flow
Shared Tree
SPT Tree
so
10.1.4.2
10.1.2.2
rtr-a
10.1.21
rtr-b
(t, 224.1.1.1), 10.1. S. 1, flags:
T ncorni ng
fieria10, nbr 10.1. 4.1
Out•qoinq
list':
(171.68..37.721/32, 2'24.1.1.1),
i rate:face: Serial i, rib:
intezface
Outgoing
State in rtr-a after Pruning
[lags:

PIM SM Pruning
SPT Case
To RP (10.1.5.1)
G) Traffic Flow
Shared
ST Tree
so
10.1.4.')
10.19.)
El
YES LAB
To Source "S
(SBC) Data
rtr-a
10.1.2.1
rtr-b
Another (SiG) data packet arrives via Seriall.

PIM SM Pruning
SPT Case
To RP (10.1.5.1)
G) Traffic Flow
Shared
ST Tree
YES LAB
To Source "S p
) prune
so
10.1.4.•»
10.1.2.)
El
r-a
10.1.2.1
rtr-b
Another (SiG) data packet arrives via Seriall.
rtr-a responds by sending an (S PG) Prune toward source.

PIM SM Pruning
SPT Case
YES LAB
To Source "S'
To (10.1.5.1)
(SS) Traffic Flow
Shared Tree
Tree
so
10.1.4.2
10.1.2.2
EO
El
rtr-a
EO
10.1.2.1
rtr-b
O Another (S F) data packet arrives via Seriall.
rtr-a responds by sending an (S f) Prune toward source.
(SiG) traffic ceases flowing down SPT.

PIM SM State Maintenanc
— Periodic Joins are sent to all PIM Neighbors.
— Periodic Joins refresh interfaces in a PIM
Neighbor's "oilists".
— Received multicast packets reset (S, G) entry
"expiration" timers.
YES LAB

Work Blog » 02_4_2_组播PIM-SM_详细图解

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02_4_2_组播PIM-SM_详细图解

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