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03-27-2005 10:42 PM - edited 03-03-2019 09:09 AM
Hello,
I have 2 main offices and several branches. Plz take a look network diagram in the attachment file.
The Internet connection come through the HQ to Telco and Telco continue providing to others branches at the provices.
The question is how to configure load balancing on EIGRP protocol on the HQ's Router, because when one of our branches(e.g. Branch C) access to the SERVERS located at HQ, the connection is very slow. It seems it goes through both interface of the router of HQ. But when I shutdown the interface s0/1 of HQ's router, the connection seem works fine, because the connection will go through to the main office A only.
I would like HQ>>>>>>>>A as Primary
HQ>>>>>>>>Telco as Secondary
Any solution would be appreciated.
Thanks in advance.
Sakdavin
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04-06-2005 06:16 AM
Hello Sakdavin,
You are right. There is no need to configure the bandwidth in routers B, C, D, E. But at Telco router and ROUTER A and ROUTER HQ, you must do it. As EIGRP use these values to set the routes in the network. Packets coming from the other routers (B, C, D, E) will be routed to router A, unless the link is down.
Did you try the configuration I mencioned?
using bandwidth, traffic-share min across-interfaces at telco router in serial on router A, HQ, and Telco.
Please, let me know.
Vladimir
and variance 2 and

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03-28-2005 12:59 AM
Hello,
You need to make sure that the bandwidth interface command is configured on all the serial interfaces , specially if the CIR is less than the actual port speed. EIGRP metrics depend on the bandwidth value.
Then find out the actual metrics for the branch subnets recieved on both serial interfaces: show ip eigrp topolgy, show ip route
Lastly, you can use traffic-share min if you want traffic forwarded through one interface/path.
This document may be helpful:
http://www.cisco.com/warp/public/103/19.html
HTH,
Mustafa
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03-29-2005 06:41 PM
Hello,
I am not sure how to define the varian and metric.
So plz check our router's configuration and network diagram in the attachment file below.
Note: My purpose is to make the connection (from HQ>>>>Main A) as a primary connection and from (HQ>>>>Telco) as a secondary connection,coz if both interface of the HQ's router are up(no shutdown), the traffic will go to both interfaces, so it makes my network performance be very slow.
If possible, pls give me any sample configuration on EIGRP, coz I don't have any experience with this before.
Any solution would be appreciated.
Sakdavin
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03-29-2005 06:47 PM
Hello,
Plz take a look at the attachment files below:
Thanks
Sakdavin

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03-30-2005 03:07 AM
Hi Sakdavin,
Here is what I came up with:
On HQ router, increase S0/1:0 metric by configuring a very low bandwidth value on it. This will not affect the actual speed of the interface. Then configure traffic-share min across-interfaces so that traffic is forwarded thru the best route only - hopefully S0/0:0
Variance is optional here, it helps in faster convergence in case S0/0:0 goes down. The optimal variance value can be calculated after S0/1:0 is brought up and the metrics are compared.
Also ip bandwidth-percent eigrp 50 100 is optional, I am assuming the actual interface speed is > 128K
HQ router configs:
interface Serial0/1:0
bandwidth 56
ip bandwidth-percent eigrp 50 100
!
router eigrp 50
variance 4
traffic-share min across-interfaces
Please let us know if this works
Regards,
Mustafa
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04-01-2005 10:00 PM
Hello Mustafa,
After I configured as your above configuration, it seems the traffic still goes to both interfaces of HQ router. So it still makes my network connection from the branch offices to HQ be very slow.
I have noticed that if I shutdown Interface s0/1:0 of HQ router, the traffic will go to the Main A router and Telco Router, and then i do a ping to my branch office, the time delay is less then two time of the connection that both interface of HQ router are UP. For example, if both interfaces are up, the time delay is TIME=68ms or more , but if I shutdown one interface, the time delay is only TIME-37ms.
I am not sure what the real problem is. So plz Help me to solve this.
Thanks.
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04-03-2005 07:58 PM
Hello sakdavin,
Could you show us the configuration of the Telco router, and tell us what kind of link do u have connecting those routers (bandwith)?
Vladimir
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04-03-2005 11:38 PM
Hello Vladimir,
Thank you for your reply.
The connection that link from HQ, Main A and Telco by E1 and its bandwidth is 2Mbps. Whereas the link from Telco to other branch offices by serial interface and its bandwidth is 64Kbps.
Any solution would be appreciated.
Sakdavin
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04-04-2005 04:33 AM
Hello Sakdavin,
I think muhssein suggestion was quite right, but you should use those commands at Telco router as well.
So, you have to configure the bandwith command in every serial interface that you have, include all routers, and you the command variance 2 and traffic-share min across-interfaces at telco router.
"In this situation, EIGRP sends packets only through router A, which is the best path to the destination network. This is identical to the forwarding behavior if the variance command is not used. However, if you use the traffic-share min command and the variance command, even though traffic is sent over the minimum-cost path only, all feasible routes get installed into the routing table, which decreases convergence times."
telco router:
interface Serial0/0:0
description Direct Link to Main A (E1 Link)
ip address 192.168.254.6 255.255.255.252
bandwith 2000
interface Serial0/1:0
description Direct Link to HQ by Breeze Link (E1 Link)
ip address 192.168.254.9 255.255.255.252
bandwith 64
router eigrp 50
offset-list 99 out 600000 Serial0/1:0
network 192.168.253.0
network 192.168.254.0
auto-summary
no eigrp log-neighbor-changes
variance 2
traffic-share min across-interfaces
Please let us know if this works
Regards,
Vladimir Franca!
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04-05-2005 05:57 PM
Hello Vladimir,
As you mentioned above, I have to configure the bandwidth to every serial interfaces of the HQ, Main A and Telco Routers, but I am not sure that why necessary to configure the bandwidth to every serial interfaces of others branch offfices' router serial interfaces?
Regards,
Sakdavin
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04-06-2005 06:16 AM
Hello Sakdavin,
You are right. There is no need to configure the bandwidth in routers B, C, D, E. But at Telco router and ROUTER A and ROUTER HQ, you must do it. As EIGRP use these values to set the routes in the network. Packets coming from the other routers (B, C, D, E) will be routed to router A, unless the link is down.
Did you try the configuration I mencioned?
using bandwidth, traffic-share min across-interfaces at telco router in serial on router A, HQ, and Telco.
Please, let me know.
Vladimir
and variance 2 and
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04-11-2005 02:35 AM
Hello Vladimir,
I have tried to configure as you above mentioned to the HQ and Telco Router, except Main A Router. And now I can turn on(no shutdown) on the two interface(Serial0/0:0) of HQ Router and the connection from others branche office to HQ's Servers seem ok, except 2 branch offices,the connection is very slow, sometimes It got down.
So do you think do i need to add some more config to get the connection better? Because now I am not sure the problem have caused by the configured or the Line.
Regards,
Sakdavin
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04-22-2005 06:21 PM
Hello,
There was a problem with my routers, and now it works fine. Thank you again for your advice.
Regards,
Sakdavin
