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Webcast-Catalyst9k
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Load balancing in Default routing

We have one default route towards next E1 interface.But due to High bandwidth utilization we are adding one more E1.

Can we enable load sharing on both E1s on the same Default route.So we can distribute the traffic.

4 ACCEPTED SOLUTIONS

Accepted Solutions

Re: Load balancing in Default routing

HI Patel, [Pls RATE if HELPS]

Since both are E1 Circuits and to load-balance easily CISCO - MULTILINK can be done.

Below is the sample Configuration. MULTILINK will start LOAD Balancing automatically when done.

interface Multilink1

description *****MULTILINK in US-NY*****

ip address x.x.x.x

ppp multilink

ppp multilink group 1

!

!

interface Serial0/3/0

description **CIR 1**

bandwidth 2048

ip address x.x.x.x

encapsulation ppp

ppp multilink

ppp multilink group 1

!

interface Serial0/3/1

description **CIR 2**

bandwidth 2048

ip address x.x.x.x

encapsulation ppp

ppp multilink

ppp multilink group 1

!

interface Multilink1

description *****MULTILINK in US-LA*****

ip address x.x.x.x

ppp multilink

ppp multilink group 1

!

!

interface Serial0/3/0

description **CIR 1**

bandwidth 2048

ip address x.x.x.x

encapsulation ppp

ppp multilink

ppp multilink group 1

!

interface Serial0/3/1

description **CIR 2**

bandwidth 2048

ip address x.x.x.x

encapsulation ppp

ppp multilink

ppp multilink group 1

!

PLS RATE if HELPS

Best Regards,

Guru Prasad R

New Member

Re: Load balancing in Default routing

Hi,

Yes we can enable load sharing between two E1 interfaces.

Configure two default routes for both the E1 with the same Administrative Distance i.e 1.

see wether IP CEF command is reflected in the sh runn command or not.

by default this load sharing is per destination and you can also configure it for per-packet.

Thanks.

Super Bronze

Re: Load balancing in Default routing

Cautionary note:

CEF per-packet load sharing if very effective on link load sharing (on same router) but it also runs the risks of delivering packets out of order. Which can, if severe enough, trigger re-transmits.

Super Bronze

Re: Load balancing in Default routing

If I understand your topology diagram, where you have separate physical paths, one option you might also consider is using OER/PfR to dynamically load balance.

5 REPLIES
Bronze

Re: Load balancing in Default routing

Re: Load balancing in Default routing

HI Patel, [Pls RATE if HELPS]

Since both are E1 Circuits and to load-balance easily CISCO - MULTILINK can be done.

Below is the sample Configuration. MULTILINK will start LOAD Balancing automatically when done.

interface Multilink1

description *****MULTILINK in US-NY*****

ip address x.x.x.x

ppp multilink

ppp multilink group 1

!

!

interface Serial0/3/0

description **CIR 1**

bandwidth 2048

ip address x.x.x.x

encapsulation ppp

ppp multilink

ppp multilink group 1

!

interface Serial0/3/1

description **CIR 2**

bandwidth 2048

ip address x.x.x.x

encapsulation ppp

ppp multilink

ppp multilink group 1

!

interface Multilink1

description *****MULTILINK in US-LA*****

ip address x.x.x.x

ppp multilink

ppp multilink group 1

!

!

interface Serial0/3/0

description **CIR 1**

bandwidth 2048

ip address x.x.x.x

encapsulation ppp

ppp multilink

ppp multilink group 1

!

interface Serial0/3/1

description **CIR 2**

bandwidth 2048

ip address x.x.x.x

encapsulation ppp

ppp multilink

ppp multilink group 1

!

PLS RATE if HELPS

Best Regards,

Guru Prasad R

New Member

Re: Load balancing in Default routing

Hi,

Yes we can enable load sharing between two E1 interfaces.

Configure two default routes for both the E1 with the same Administrative Distance i.e 1.

see wether IP CEF command is reflected in the sh runn command or not.

by default this load sharing is per destination and you can also configure it for per-packet.

Thanks.

Super Bronze

Re: Load balancing in Default routing

Cautionary note:

CEF per-packet load sharing if very effective on link load sharing (on same router) but it also runs the risks of delivering packets out of order. Which can, if severe enough, trigger re-transmits.

Super Bronze

Re: Load balancing in Default routing

If I understand your topology diagram, where you have separate physical paths, one option you might also consider is using OER/PfR to dynamically load balance.

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