Information Technology Reference
In-Depth Information
Monitor
Monitor
CoISM
Broker
CoISM
Broker
Analyzing
Engine
Analyzing
Engine
BGP route table
Collector
BGP route table
Collector
CoISM
Registry
Messages
(TCP/IP)
Monitor
Monitor
iBGP Session
iBGP Session
eBGP Session
R
R
R
R
R
R
BGP
Routers
AS A
AS B
Fig. 3.
Deployment and implementation of CoISM
information (e.g., IP addresses) for each AS. AS can get the monitor deployment
view through CoISM. Be different from IRR, CoISM registry only provides the
distribution view of BGP monitor and does not strive AS submit their monitoring
information.
4 Simulations and Analysis
In this section, we define several indicators to evaluate the eciency of CoISM.
1.
Effective Coverage Ratio
Effective coverage ratio is used to assess whether CoISM implements infor-
mation on-demand. In equation 1, function
Cover
(
I
i
,
M
j
)
ₒ{
0,1
}
indicates
whether monitor
M
j
is covered by message
I
i
. Function Valid(
I
i
,
M
j
)
ₒ{
0,1
}
indicates whether message
I
i
is effective to monitor
M
j
.
i
=1
(
Cover
(
I
i
,M
j
)
n
Valid
(
I
i
,M
j
))
i
=1
Cover
(
I
i
,M
j
)
∗
(1)
j
=1
2.
Profit Ratio
Profit ratio is used to indicate the incentive effect of CoISM. Function
Imp
(
I
i
,
M
j
)
indicates whether message
I
i
is received from other moni-
tor. Function Exp(
I
i
,
M
j
)
ₒ{
0,1
}
ₒ{
}
indicates whether message
I
i
is exported by
0,1
entity
M
j
.
m
Valid
(
I
i
,M
j
)
Exp
(
I
i
,M
j
)+
Imp
(
I
i
,M
j
)
Import
(
I
i
,M
j
)
∗
(2)
∗
Valid
(
I
i
,M
j
)
i
=1
