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Bandwidth and EIGRP settings
Folks:
I am trying to understand when I would set the bandwidth on my T1 link artificially low, and increase the percentage of bandwidth EIGRP would/will use. Can anyone give a real world example?
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Interface serial 1
bandwidth 40
ip bandwidth-percent eigrp 1 200
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As you see from my example, I am setting the bandwidth for eigrp to use 80 kbps. Is this going to be enough for a T1 link?
Thank you
J
I am trying to understand when I would set the bandwidth on my T1 link artificially low, and increase the percentage of bandwidth EIGRP would/will use. Can anyone give a real world example?
//
//
Interface serial 1
bandwidth 40
ip bandwidth-percent eigrp 1 200
//
//
As you see from my example, I am setting the bandwidth for eigrp to use 80 kbps. Is this going to be enough for a T1 link?
Thank you
J
Utini!
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kryolla
Member Posts: 785
I think by default this is set to 50% of the link bandwidth. It was set to this so that eigrp traffic doesn't take over the link. If you were to play with the setting you can either loose your neighbor if you were to lower it or have eigrp take over the link if you were to raise it. Taken into account the clock rate of the interface. For a T1 I would leave it as the default and for some reason if i start having a bouncing neighbor or routes getting removed then istalled, I would investigate why am I having so much eigrp traffic and if it is legit then bump it up i..e having 100k eigrp routes or start thinking of a way to decrease the size of the routing table. You will more than likely play with this on slow bandwidth links and frame relay links. My 2 centsStudying for CCIE and drinking Home Brew -
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e24ohm
Member Posts: 151
I appreciate your help...thanks.I think by default this is set to 50% of the link bandwidth. It was set to this so that eigrp traffic doesn't take over the link. If you were to play with the setting you can either loose your neighbor if you were to lower it or have eigrp take over the link if you were to raise it. Taken into account the clock rate of the interface. For a T1 I would leave it as the default and for some reason if i start having a bouncing neighbor or routes getting removed then istalled, I would investigate why am I having so much eigrp traffic and if it is legit then bump it up i..e having 100k eigrp routes or start thinking of a way to decrease the size of the routing table. You will more than likely play with this on slow bandwidth links and frame relay links. My 2 centsUtini! -
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Bosefus
Member Posts: 67 ■■□□□□□□□□
If you set the bandwidth lower than the physical link, will the link become under utilized?
For instance setting a T1 to 768 with the bandwidth command, will 1.544 worth of data still be able to be send down the link?
If for all purposes the router things the link is 768 because of the command, I dont see how it could send 1.544 but I have been told that it still would.
If I understand it correctly, the load rating of the show interface output would also take into account the bandwidth command.Working on CCNP, passed BSCI, Currently working on ONT. -
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networker050184
Mod Posts: 11,962 Mod
If you set the bandwidth lower than the physical link, will the link become under utilized?
For instance setting a T1 to 768 with the bandwidth command, will 1.544 worth of data still be able to be send down the link?
If for all purposes the router things the link is 768 because of the command, I dont see how it could send 1.544 but I have been told that it still would.
If I understand it correctly, the load rating of the show interface output would also take into account the bandwidth command.
The bandwidth command does not affect the traffic rate sent out of the interface. It is only used as a reference by the router for calculations by routing protocols and QoS processes.An expert is a man who has made all the mistakes which can be made. -
OptionsBosefus
Member Posts: 67 ■■□□□□□□□□
Thank you for clearing that up for me.Working on CCNP, passed BSCI, Currently working on ONT.