asked on

Combine/Merge bandwidth of 4 ISP and get single on Cisco Router

Hello Experts,

We have 4 Ethernet Point 2 Point link between my 2 branch office location 1 & location 2 distance between both office is 1430 KM
and getting end to end latency 25-32 ms. From both sides all links connected with Cisco 2811 Router (HWIC Port) & configure as a eigrp 100

once i send traffic (download or upload) from location 1 to location 2 why its using only one interface, it should be distributed & forwarded from using
all 4 interfaces as a single (marge) speed.

please suggest configuration to forward traffic using all interface as a equal- equal bandwidth

Location 1 Router

interface FastEthernet0/0
ip address 192.168.10.1 255.255.255.0
ip flow ingress
duplex auto
speed auto
!
interface FastEthernet0/1
description 4MBPS Link
ip address 1.1.1.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/0/0
description 2 MBPS Link
ip address 2.2.2.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/0/1
description 2 MBPS Link
ip address 3.3.3.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1/0
description 2 MBPS Link
ip address 4.4.4.1 255.255.255.0
duplex auto
speed auto
!
!
router eigrp 100
network 1.1.1.0 0.0.0.3
network 2.2.2.0 0.0.0.3
network 3.3.3.0 0.0.0.3
network 4.4.4.0 0.0.0.3
network 192.168.10.0

Location 2 Router

interface FastEthernet0/0
ip address 192.168.207.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
description 4MBPS Link
ip address 1.1.1.2 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/0/0
description 2 MBPS Link
ip address 2.2.2.2 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/0/1
description 2 MBPS Link
ip address 3.3.3.2 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1/0
description 2 MBPS Link
ip address 4.4.4.2 255.255.255.0
duplex auto
speed auto
!
!
router eigrp 100
network 1.1.1.0 0.0.0.3
network 2.2.2.0 0.0.0.3
network 3.3.3.0 0.0.0.3
network 4.4.4.0 0.0.0.3
network 192.168.100.0

TimotiSt

Based on the interface descriptions the bandwidth is not quite equal on the interfaces, so I'd set them with the 'bandwidth' command under the interfaces first. The bandwidth command doesn't limit physical interface speed, it just informs the EIGRP process that while FastEthernet0/1 is a 100Mb interface, the actual bandwidth is 4Mb on it (on Router 2).

Once that's done, enable variance on the EIGRP protocol to consider different speeds (unequal cost multipath) and set traffic sharing to be balanced (send 2-1-1-1 ratios on the 4-2-2-2Mb links).

router eigrp 1 
 network x.x.x.x 
 variance 3
 traffic-share balanced

Open in new window

As all interfaces are ethernet, you shouldn't need the 'ip load-sharing per-packet' interface command.

Details:
https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/13677-19.html

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