# EIGRP VARIANCE_DOC USAGE AND IE LAB VOL 4.10 MODULE SAT DEC 27 2K8#  

Monday, December 29, 2008

# EIGRP VARIANCE_DOC USAGE AND IE LAB VOL 4.10 MODULE SAT DEC 27 2K8#



VARIANCE (EIGRP):

To control load balancing in an internetwork based on
the EIGRP , use the variance command in router
config mode.

USAGE GUIDELINES:

Setting a variance value enables EIGRP to install
multiple loop-free routes without unequal cost in a
local routing table.

A route learned through EIGRP must meet two criteria
to be installed in the local routing table

The route must be loop-free. This condition
is satisfied when the reported distance is
less than the total distance or when the
route is fs.

The metric of the route must be lower than
the metric of the best route multiplied by
the variance configured on the router

NOTE:
EIGRP does not load-share between multiple route;
it only installs the routes in the local routing
table.

Then, the local routing table enables switching
hardware or software to load-share between the
multiple paths





CODE
r4#sir 155.0.5.0
Routing entry for 155.0.5.0/24
Known via "eigrp 100", distance 90, metric 10639872, type internal
Redistributing via eigrp 100
Last update from 155.0.45.5 on Serial0/1, 00:02:34 ago
Routing Descriptor Blocks:
155.0.45.5, from 155.0.45.5, 00:02:34 ago, via Serial0/1

Route metric is 40640000, traffic share count is 21------------->$$$$$$$$$

Total delay is 25000 microseconds, minimum bandwidth is 64 Kbit
Reliability 255/255, minimum MTU 1500 bytes
Loading 1/255, Hops 1
* 155.0.0.5, from 155.0.0.5, 00:02:34 ago, via Serial0/0

Route metric is 10639872, traffic share count is 80--------------->$$$$$$$$$

Total delay is 25000 microseconds, minimum bandwidth is 256 Kbit
Reliability 255/255, minimum MTU 1500 bytes
Loading 1/255, Hops 1


FORGOT to mention there were instances where i played with "TRAFFIC SHARE MIN" and "traffic share balanced" commands ..

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