EIGRP formula :
Topology : All protocol running EIGRP &
Connected with defualt Fast Ether BW & DLY
##############################################
Topology
R2 <====R4<===>R1<===> R3<====>R4
#################################################
256{ 10^7/Min BW in Kbps + combined delay in 10th of Microsecond }
256 { 10^7/100000 + (5250/10) }256 { 100+525}
= 160000
In another word issue :
sh ip eigrp topology x.x.x.x mask command &
divide total delay by 10 ( which will give us 10th of micro second )
sh ip eigrp topology 4.4.4.4 255.255.255.255
1#sh ip eigrp top 4.4.4.4 255.255.255.25
IP-EIGRP (AS 1): Topology entry for 4.4.4 State is Passive,
Query origin flag is Routing Descriptor Blocks: 172.16.12.2 (FastEthernet1/0),
from 172 Composite metric is (158720/156160) Vector metric: Minimum bandwidth is 100000 Kbit Total delay is 5200 microseconds Reliability is 255/255 Load is 1/255 Minimum MTU is 1500 Hop count is 2
172.16.13.3 (FastEthernet0/0), from 172 Composite metric is (160000/144640) (FD/AD) Vector metric: Minimum bandwidth is 100000 Kbit Total delay is 5250 microseconds Reliability is 255/255 Load is 1/255 Minimum MTU is 1500 Hop count is 2
=====================================================
For unequal cost load balancing First Feasible condition needs to meet :
FD ( aka current best route metric ) needs to be greater than Candidate's AD ( even equal do not work) Or AD needs to lower than AD In another word ( I will say on command line ):
Topology : All protocol running EIGRP & Connected with defualt Fast Ether BW & DLY R2 ----------------------R4 (4.4.4.4)R1======== R3-----------------------R4
Feasibility condtion : FD 158720 > AD 144640 or AD 144640 < 2 ="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="Once" r2 =" FD="158720" 2 ="317440" r1="="="="="="="="" r1="="="="="="">R2======>R4 ===Lo4 10 10 500
R1=======>R3======>R4===Lo4 x 10 500
In Order to find X to get the Metric 317440
Desired Metric 317440 = 256{ 10^7/100000 + Total Delay }
=256{ 100 + ( X + 10 + 500 ) } =256 { X + 610 } X = 625
Topology : All protocol running EIGRP &
Connected with defualt Fast Ether BW & DLY
##############################################
Topology
R2 <====R4<===>R1<===> R3<====>R4
#################################################
256{ 10^7/Min BW in Kbps + combined delay in 10th of Microsecond }
256 { 10^7/100000 + (5250/10) }256 { 100+525}
= 160000
In another word issue :
sh ip eigrp topology x.x.x.x mask command &
divide total delay by 10 ( which will give us 10th of micro second )
sh ip eigrp topology 4.4.4.4 255.255.255.255
1#sh ip eigrp top 4.4.4.4 255.255.255.25
IP-EIGRP (AS 1): Topology entry for 4.4.4 State is Passive,
Query origin flag is Routing Descriptor Blocks: 172.16.12.2 (FastEthernet1/0),
from 172 Composite metric is (158720/156160) Vector metric: Minimum bandwidth is 100000 Kbit Total delay is 5200 microseconds Reliability is 255/255 Load is 1/255 Minimum MTU is 1500 Hop count is 2
172.16.13.3 (FastEthernet0/0), from 172 Composite metric is (160000/144640) (FD/AD) Vector metric: Minimum bandwidth is 100000 Kbit Total delay is 5250 microseconds Reliability is 255/255 Load is 1/255 Minimum MTU is 1500 Hop count is 2
=====================================================
For unequal cost load balancing First Feasible condition needs to meet :
FD ( aka current best route metric ) needs to be greater than Candidate's AD ( even equal do not work) Or AD needs to lower than AD In another word ( I will say on command line ):
Topology : All protocol running EIGRP & Connected with defualt Fast Ether BW & DLY R2 ----------------------R4 (4.4.4.4)R1======== R3-----------------------R4
Feasibility condtion : FD 158720 > AD 144640 or AD 144640 < 2 ="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="="Once" r2 =" FD="158720" 2 ="317440" r1="="="="="="="="" r1="="="="="="">R2======>R4 ===Lo4 10 10 500
R1=======>R3======>R4===Lo4 x 10 500
In Order to find X to get the Metric 317440
Desired Metric 317440 = 256{ 10^7/100000 + Total Delay }
=256{ 100 + ( X + 10 + 500 ) } =256 { X + 610 } X = 625
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