help please

chinaman

Is the no auto-summary required on eigrp ? and also can somebody explained to me the meaning of
"rip can load balance up to four and max of six, however unlike igrp and eigrp, they must be equal cost of links."

I am confused with this I read many times but I cannot understand.

I am using sybex 5th edition.

It is mentioned on the book that RIP will load balance if it see's equal path to a remote network. okay this is clear but How about IGRP and EIGRP it use BW and Delay so the lowest cost will be come a path to a remote network let say comparing a 56 kbps to a t3 of course T3 will be used but what do you mean by the above sentence.

Thanks for the big help

twiggy87

If auto-summarization is enabled, the router will automatically
summarize routes at classful network boundary and advertise a single
route for an entire Class A, B, or C network. However, if your lab only
consists of classful networks, but not subnets, you will not see any
difference by turning the feature on or off.

As far as load balancing is concerned, rip will by default only load balance across four equal-cost links but it can do up to 6. Igrp and eigrp by default load balance across equal-cost paths only. You can use the variance multiplier value command to configure unequal-cost load balancing

kplab

http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_configuration_guide_chapter09186a00800ca761.html#1001013