11-25-2008 10:09 PM - edited 03-04-2019 12:30 AM
Hi ,
Can i load balance over 2 Leased lines with same characteristics with 2 defaults routes over these 2 links from different service providers ?
11-25-2008 10:42 PM
yes and you can use IP SLA to automatically detect if the other link is down.
http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/44sg/configuration/guide/swipsla.html
11-25-2008 11:55 PM
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 ?
11-26-2008 12:18 AM
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
11-26-2008 12:23 AM
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
11-26-2008 12:30 AM
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.
11-26-2008 01:26 AM
Hi Cheng,
Thank you . its useful info ..
Thanks
Vimal
11-26-2008 12:27 AM
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.
11-26-2008 12:40 AM
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
11-26-2008 01:27 AM
Hi Ari,
Thanks a lot . I will try SLA .
Vimal
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