howtonetwork.net

Cisco Certification Training

  • Products
  • CCNA
    • CCNA Videos
    • CCNA Lectures
    • CCNA Practice Exams
    • Challenge Labs
      • Challenge Video Solutions
    • Cisco Commands
  • CCNP ROUTE
    • ROUTE Exams
  • CCNP SWITCH
    • SWITCH Exams
  • CCNP TSHOOT
  • Home
  • Join
  • Downloads
  • About Us
  • Whitepapers
  • Feature Articles
  • Helpdesk
  • FAQ
  • Free Training
You are here: Home / variance

variance

Command

Variance (EIGRP)

Use

Allows EIGRP to install unequal load balancing to the routing table.

Syntax

Router(config-router)#variance [multiplier value]

Example
simple

In this example, we will configure R4 to utilize both links to reach R5’s loopback networks.

Currently we have a basic EIGRP setup for this example

R4

router eigrp 222
network 4.4.4.4 0.0.0.0
network 150.10.0.0
network 150.11.0.0
network 200.0.0.0
no auto-summary

Lets see what the routing table looks like:

R4(config-if)#do sh ip route eigrp

200.0.0.0/32 is subnetted, 2 subnets
D 200.0.0.5 [90/156160] via 150.10.45.5, 00:00:44, FastEthernet1/0
5.0.0.0/24 is subnetted, 1 subnets
D 5.5.5.0 [90/156160] via 150.10.45.5, 00:00:44, FastEthernet1/0

Currently we are just using the fastethernet link between R4 and R5 to reach the loopbacks.

P 200.0.0.5/32, 1 successors, FD is 156160
via 150.10.45.5 (156160/128256), FastEthernet1/0
via 150.11.54.5 (2297856/128256), Serial0/0

To calculate the variance multiplier take the highest cost in this case 2297856 and divide it by the lowest cost you want to use.
2297856/156160 = 14.7 so the variance we need is 15

R4(config)#router eigrp 222
R4(config-router)#variance 15

R4(config-router)#do sh ip route eigrp
200.0.0.0/32 is subnetted, 2 subnets
D 200.0.0.5 [90/2297856] via 150.11.54.5, 00:03:55, Serial0/0
[90/156160] via 150.10.45.5, 00:03:55, FastEthernet1/0
5.0.0.0/24 is subnetted, 1 subnets
D 5.5.5.0 [90/2297856] via 150.11.54.5, 00:03:55, Serial0/0
[90/156160] via 150.10.45.5, 00:03:55, FastEthernet1/0
Get access to over 5 hours of IT webinar videos as well as regular study tips and ideas when you
join our mailing list

About This Site

We replaced this site some time ago with an upgraded version. Please feel free to enjoy the content and if you like what you see check out our brilliant new site:

howtonetwork.com

Keep In Touch

About Us

This is a free access website which has now been replaced by howtonetwork.com.

Navigation

  • Home
  • Join
  • Downloads
  • About Us
  • Whitepapers
  • Feature Articles
  • Helpdesk
  • FAQ
  • Free Training

Copyright

All content is protected by international copyright laws. Copyright Reality Press Ltd.

Copyright © 2023 · Dynamik Website Builder on Genesis Framework · WordPress · Log in