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http://sfc-cpu.ai3.net/~husni/pim-udlr-config/
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We Did These
• Experiment in AI3 C-band UDL network• Generalize the experiment result
– network topology
http://sfc-cpu.ai3.net/~husni/pim-udlr-config/
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Objective
• to investigate the simplest effective configuration of PIM-SM over UDLR– where routing is asymmetric and – there is no separate MRIB
http://sfc-cpu.ai3.net/~husni/pim-udlr-config/
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A Unicast Routing in UDLR
• FEED -> RECV : UDL• RECV -> FEED : BDL
FEED networkFB1
FU
HF
RECV network RU1
RB1
H1RECV networkRU2
RB2
H2
FB2
BDLnet2BDLnet1
UDLnet
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Problem in Using PIM-SM
• Multicast traffic flow via BDL
FEED networkFB1
FU
SF
RECV network RU1
RB1
R1
RECV networkRU2
RB2
R2
FB2RP
BDLnet2BDLnet1
UDLnet
RP Tree Shortest Path Tree
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Proposed Configuration (1/3)
FEED networkFB1
FU
HF
RECV network RU1
RB1
H1RECV networkRU2
RB2
H2
FB2
BDLnet2BDLnet1
RP
To RECV net.To FEED net.
To UDLnet
UDLnet
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Proposed Configuration (2/3)
① RP is the address of the UDL interface of the feed router
② Receivers in receive network never to switch to SPT
③ Configure the networks so receive networks reach RP through the UDL
• Join path uses UDL
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Proposed Configuration (3/3)
• Item ③– If using routing protocol– Cost of the unidirectional link interface of recei
ve routers is not to be huge– Re-compute interface costs of routers
• achieve routing config. as the previous slide• minimize the number of re-computed interfaces
– A rule of thumb to configure interface costs• for a more general network topology
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A Rule of Thumb for Interface Costs
• V is a constant
FEED networkFB1
FU
HF
RECV network RU1
RB1
H1RECV networkRU2
RB2
H2
FB2
2V
5V
7V2V
5V
V
V3V
BDLnet2BDLnet1
UDLnet
5V
V
2V
7V
3VV
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Determining V
• Set V such that V is the determinant of inter-network path selection
• V > 2*max(rc(R,U)-rc(R,B), rc(X2,R) – rc(Y2-R), …)
• Placing U and B on one subnet simplifies our life.
Net X
X1
X2Net Y
Y1
Y2
U B
R
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Next Step…
• I-D
