2 Default routes on same router with 2 Leased line from 2 service providers

Unanswered Question
Nov 25th, 2008

Hi ,


Can i load balance over 2 Leased lines with same characteristics with 2 defaults routes over these 2 links from different service providers ?

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vimalkumars Tue, 11/25/2008 - 23:55

Hi Friend ,


Thank you for reply . I have both Dedicated circuits with same BW and other characteristics ( From same service provider ) terminated on same router with 2 default routes over these circuits . as below configuration . No routing protocols configured


ip route 0.0.0.0.0.0.0.0 int se0

ip route 0.0.0.0.0.0.0.0 int se1



If it load balances over these 2 links , Can you please explain how ?


vassiliev Wed, 11/26/2008 - 00:18

If you have 2 dedicated circuits, I suggest you can use multilink.


Ex:

int multilink 10

en ppp

ip address x.x.x.x y.y.y.0


int s1/0

en ppp

ppp multilink group 10

no shut


int s2/0

en ppp

ppp multilink group 10


ip route 0.0.0.0 0.0.0.0 multilink 10


It will use two circuit for your network.


Hope help you~!

Best Regards

Cheng

vimalkumars Wed, 11/26/2008 - 00:23

Hi Cheng ,


Thank you ..


I misunderstood our situation . Actually we have 2 dedicated circuits with same BW and characteristics from different service providers for the same destiantion .


Can we load balance by configuring 2 default routes on these 2 circuits ?



Thanks


Vimal


vassiliev Wed, 11/26/2008 - 00:30

Yes, you can do this.

But something risks in this. Because these ISP delay is not same.

If you do this, please advisement circuit delay~! It is very important for this.



ariesc_33 Wed, 11/26/2008 - 00:27

with static routes, there will be two equal cost paths and your router will load balance between them.


the issue here is that when static routing is in use, when the other link is down, your router will still use or advertise that route.


the solution here is to implement ip sla to monitor the status of the interface or the link.

ariesc_33 Wed, 11/26/2008 - 00:40

using icmp to monitor the link status


track 10 rtr 1 reachability

!

track 20 rtr 2 reachability

!

ip route 0.0.0.0 0.0.0.0 1.1.1.1 track 10

ip route 0.0.0.0 0.0.0.0 2.2.2.2 track 20

!

!

ip sla 1

icmp-echo 1.1.1.1 source-ip 192.168.1.1

timeout 1000

threshold 50

frequency 1

ip sla schedule 1 life forever start-time now

ip sla 2

icmp-echo 2.2.2.2 source-ip 192.168.1.1

timeout 1000

threshold 50

frequency 1

ip sla schedule 2 life forever start-time now

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