Eigrp path selections

[feroz syed]

Hi,

Router 5 has only one path to reach router 6 loopback address (6.6.6.6) in topology table there is no fesible sucessor.how to install all possible path to reach router 6

Router5#sh ip eigrp topology

P 6.6.6.6/32, 1 successors, FD is 156160

        via 150.0.0.6 (156160/128256), FastEthernet0/0

[paul driver]

Hello
do you have alternate path to this loopback?

res
paul

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[feroz syed]

only one path to reach r5 to r6 via switch, but i want to use all path i mean from r5-r4-r6  r5-r2-r6 include serial interface.

R5#sh ip eigrp topology all-links

IP-EIGRP Topology Table for AS(100)/ID(5.5.5.5)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,

       r - reply Status, s - sia Status

P 1.1.1.1/32, 2 successors, FD is 2560002816, serno 190

        via 25.0.0.2 (2560002816/2560000256), FastEthernet2/0

        via 150.0.0.2 (2560002816/2560000256), FastEthernet0/0

        via 45.0.0.4 (2560005376/2560002816), FastEthernet0/1

        via 205.0.0.2 (2560512256/2560000256), Serial1/0

P 3.3.3.3/32, 2 successors, FD is 2560002816, serno 189

        via 25.0.0.2 (2560002816/2560000256), FastEthernet2/0

        via 150.0.0.2 (2560002816/2560000256), FastEthernet0/0

        via 45.0.0.4 (2560005376/2560002816), FastEthernet0/1

        via 205.0.0.2 (2560512256/2560000256), Serial1/0

P 4.4.4.4/32, 2 successors, FD is 156160, serno 165

        via 45.0.0.4 (156160/128256), FastEthernet0/1

        via 150.0.0.4 (156160/128256), FastEthernet0/0

        via 25.0.0.2 (158720/156160), FastEthernet2/0

        via 205.0.0.2 (2300416/156160), Serial1/0

P 2.2.2.2/32, 2 successors, FD is 2560002816, serno 173

        via 25.0.0.2 (2560002816/2560000256), FastEthernet2/0

        via 150.0.0.2 (2560002816/2560000256), FastEthernet0/0

        via 45.0.0.4 (2560005376/2560002816), FastEthernet0/1

        via 205.0.0.2 (2560512256/2560000256), Serial1/0

P 6.6.6.6/32, 1 successors, FD is 156160, serno 163

        via 150.0.0.6 (156160/128256), FastEthernet0/0

        via 25.0.0.2 (158720/156160), FastEthernet2/0

        via 45.0.0.4 (158720/156160), FastEthernet0/1, serno 135

        via 205.0.0.2 (2300416/156160), Serial1/0, serno 126

P 5.5.5.5/32, 1 successors, FD is 128256, serno 1

        via Connected, Loopback0

        via 205.0.0.2 (2300416/156160), Serial1/0

P 25.0.0.0/24, 1 successors, FD is 28160, serno 2

        via Connected, FastEthernet2/0

        via 150.0.0.2 (30720/28160), FastEthernet0/0

        via 205.0.0.2 (2172416/28160), Serial1/0

P 26.0.0.0/24, 3 successors, FD is 30720, serno 172

        via 25.0.0.2 (30720/28160), FastEthernet2/0

        via 150.0.0.2 (30720/28160), FastEthernet0/0

        via 150.0.0.6 (30720/28160), FastEthernet0/0

        via 45.0.0.4 (33280/30720), FastEthernet0/1

        via 205.0.0.2 (2172416/28160), Serial1/0

P 45.0.0.0/24, 1 successors, FD is 28160, serno 3

        via Connected, FastEthernet0/1

        via 150.0.0.4 (30720/28160), FastEthernet0/0

        via 205.0.0.2 (2174976/30720), Serial1/0

P 46.0.0.0/24, 3 successors, FD is 30720, serno 164

        via 45.0.0.4 (30720/28160), FastEthernet0/1

        via 150.0.0.4 (30720/28160), FastEthernet0/0

        via 150.0.0.6 (30720/28160), FastEthernet0/0

        via 25.0.0.2 (33280/30720), FastEthernet2/0

        via 205.0.0.2 (2174976/30720), Serial1/0, serno 128

P 123.0.0.0/24, 2 successors, FD is 2560002816, serno 174

        via 25.0.0.2 (2560002816/2560000256), FastEthernet2/0

        via 150.0.0.2 (2560002816/2560000256), FastEthernet0/0

        via 45.0.0.4 (2560005376/2560002816), FastEthernet0/1

[paul driver · Accepted solution]

hello

at present there is only one successor via rtr 6 as the others are not meeting thr FC - for this to happen the need a have a reportered distance lower then the existing feasible distance of this route

this can be done by manipulating the delay vlaues of the links on the other rtrs interfaces

res
paul
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[feroz syed]

please not understand can you explain little brief

current routing path is 

reported distance= 156160   but RD cant be decreased but can increase

Fesible distance= 128256

all other router fessible distance is 156160 are same but reported distance is higher then current distance

[paul driver]

The reported distance is not meeting the Feasible.condition of being lower than the current feasible distance of the current route

res
paul

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[Vasilii Mikhailovskii]

Hello.

Just in theory (because in production we will have to answer a lot of question before) you should increase delay on R5 f0/0 by 1; this will allow other neighbors to become FS (but could affect other routing).

[paul driver]

Hello

I wouldn't increase or decrease any delay on either rtr5/6 but decrease it on the other rtrs to make them more appealing.

However this need to be calculated has to not change the current routing path.


P 6.6.6.6/32, 1 successors, FD is 156160, serno 163
via 150.0.0.6 (156160/128256), FastEthernet0/0
via 25.0.0.2 (158720/156160), FastEthernet2/0
via 45.0.0.4 (158720/156160), FastEthernet0/1, serno 135
via 205.0.0.2 (2300416/156160), Serial1/0, serno 1


via 25.0.0.2 (158720/156160), FastEthernet2/0 - the composite metric and the reported distance is currently higher then the FD of the current route

If you lower the delay value on the attached rtr interface of fa0/2 this will also change the composite metric and its reported distance value to be lower

This is calculated by a default eigrp defined formula of bw & delay

Bw (lowest interface bw on route path) / 10^7
+
Delay / 10 (total sum on interfaces delay on route path)

= bw+delay * 256


So you need to be careful of changing any values if you are not totally confident in eigrp metric manipulation

Res
Paul


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[Vasilii Mikhailovskii]

Ok, if you don't want to change delay, then we could tune metric directly:

R5:

access-list 6 permit 6.6.6.6

router eigrp 1

offset-list 6 in 1 f0/0

variance 128

[paul driver]

Helllo

Can you please explain the offset, why would it help in this situation and how do you get a varience of 128?

res
paul

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[feroz syed]

variance 15 can get 2342400 bycomparing serial interface reported distance

via 205.0.0.2 (2300416/156160), Serial1/0, serno 1

what is the use of this command ?

offset-list 0 in 1000 fa 0/0

[paul driver]

hello
the.offset pist.you have stated.will apply an interface metric of 10000 to all routes traversing that link

the varience is for load balancing on equal and unequal eirgp routeing paths

what you originally was querying was to obtain multiple feasible sucessors not to load balance -am i correct?

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