From: kasturi cisco (kasturi_cisco@hotmail.com)
Date: Sat Mar 27 2004 - 12:46:46 GMT-3
K C,
Variance for a a set of routes is not always 2. It could be anything
depending on what the distance is in toplogy table.
To calculate variance use the thumb rule of "worst metric/best metric =
n" and then round of 'n' to higher number.Also the routes being
considered must be in the EIGRP toplogy table and the Feasibilty cond
must be met etc etc (i guess u are aware of those).
So take ur 2 routes here
5.5.5.5/32, 1 successors, FD is 156160
via 142.1.65.5 (156160/128256), FastEthernet2/0
via 142.1.56.5 (386560/128256), FastEthernet0/0
for this the variance would be 386560/156160 = 2.475 ~ 3.
So variance would be 3 to get these 2 routes into table if all
other conditions are met.
See Doyle Page 252-253 for more details (same rules apply for EIGRP
too).Some of these link will also help.
http://www.cisco.com/en/US/tech/tk365/tk207/technologies_tech_note09186a008009437d.shtml<
/A>
http://www.cisco.com/en/US/tech/tk365/tk207/technologies_white_paper09186a0080094cb7.shtml
http://www.groupstudy.com/archives/ccielab/200306/msg00753.html
Good Luck,
Kasturi.
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