Router (config) # router IGRP 100
Router (config-router) # network 192.168.1.0
Router (config-router) # network 200.200.1.0
Router (config-router) # variance?
<1-128> Metric variance multiplier
Router (config-router) # variance 2
Router (config-router) # traffic-share?
Share inversely proportional to balanced metric
Among min All traffic shared min metric paths
router IGRP 100 specified IGRP as the routing protocol for autonomous system 100, this value varies from 1 to 65535
network specified networks directly connected to the router that will be announced by IGRP
variance (optional) set the cost load balancing uneven defining the difference between the best metric and the worst acceptable metric.
variance [multiplier] (optional) specifies the range of values of metrics that will be accepted for load balancing.
traffic-share [balanced | min] (optional) controls how traffic is distributed among routes IGRP load comparison.
• Balanced = Traffic is distributed proportionately to the relationship between different metrics.
• Min = Specifies which routes should be used at minimal cost.
Then you copy a show ip protocols, note the update time (90segundos), the constants K1 and K3 and to delay bandwidth used by default as a metric, the default number of hops 100, and three partner networks.
Copy of a show ip protocols:
Router # show ip protocols
Routing Protocol is "IGRP 100"
Sending updates Every 90 seconds, next due in 49 seconds
Invalid After 270 seconds, hold down 280, flushed after-630
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
IGRP metric weight K1 = 1, K2 = 0, K3 = 1, K4 = 0, K5 = 0
100 IGRP maximum hopcount
IGRP maximum metric variance 1
Redistributing: IGRP 100
Routing for Networks:
192.168.1.0
200.200.10.0
172.16.0.0
Routing Information Sources:
Gateway Distance Last Update
Distance: (default is 100)
You can see the update time, the hold down, the constant that compose the measure, partner networks and administrative distance between some parameters.
IGRP and EIGRP are redistributed automatically if both have the same autonomous system number.