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Home > Archive > CCNP > May 2003 > Regarding EIGRP
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| Mad21maxx 2003-05-05, 3:39 pm |
| I understand that EIGRP uses only 50% of the defined bandwidth by default. Are there any disadvantages in setting it up to use the entire bandwidth of the link. | |
| anchor40 2003-05-05, 5:07 pm |
| I guess the safe answer is "it depends." 
How many nodes are in your network? What size pipes are you using? Are the circuits in question Frame RElay or Leased Line? How often will there be changes (new, growing network or stable, stagnate network)? Do you have mission critical data that is extremely sensitive to even the littlest bit of delay?
On the other hand, you need to ask why you're asking. If this is for educational purposes, great. But for the real world, your network must be pretty big (large routing updates) or having lots of changes if you're worried about convergence time on EIGRP. A sniffer trace will show you how much data is sent with your routing updates.
I know I've never had to adjust that, but my PVCs have always been 16kb or higher on a large, stable network.
HTH... | |
| Mad21maxx 2003-05-05, 5:17 pm |
| I was asking just for educational purposes.
For example if I have a 56K link, eigrp would use 28k. But all of the user's data will use the entire 56K.
The 28K would only be used for the routing updates.
Is this correct? | |
| ZacDogg 2003-05-06, 7:57 pm |
| I think a better way to phrase this would be, EIGRP by default will only use UP TO 50% of available bandwidth.
To answer your original question. Yes there are disadvantages of allowing EIGRP to use all your bandwidth. The largest being, if you have a low bandwidth link and an unstable network, it's possible that EIGRP will consume all your bandwidth and starve out other traffic.
Zac |
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