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Community Member

OSPF loadbalancing

i have 4 links for a same location, which is in Backbone area.

but there is no load balancing

7 REPLIES

Re: OSPF loadbalancing

Need more information on your netowrk topology

Narayan

Community Member

Re: OSPF loadbalancing

i have 2 locations

Location A- 7507 router(12.1)

Location B- 3660 router (12.2)

both are in OSPF AREA 0

From location A to Location B

i have four 2MB link, all are in same cost

plz suggest me how i can use four link with proper load balancing

for more requirement plz inform me

Re: OSPF loadbalancing

ospf by default shoudl loadbalnce across 4 links if all of them are of the same metric

Can you post a sh ip ospf dataabse and sh ip route from both the routers

Narayan

Community Member

Re: OSPF loadbalancing

Location A

DLI-SM3>sh ip rou

DLI-SM3>sh ip route 10.205.10.253

Routing entry for 10.205.10.0/24

Known via "ospf 1", distance 110, metric 49, type intra area

Last update from 10.205.248.1 on Serial0/1/5, 00:00:20 ago

Routing Descriptor Blocks:

10.205.49.114, from 10.220.10.254, 00:00:20 ago, via Serial4/0/3

Route metric is 49, traffic share count is 1

* 10.205.49.33, from 10.220.10.254, 00:00:20 ago, via Serial1/0/5

Route metric is 49, traffic share count is 1

10.205.248.1, from 10.220.10.254, 00:00:20 ago, via Serial0/1/5

Route metric is 49, traffic share count is 1

Location B

DDN-SES1>sh ip route 10.205.48.3

Routing entry for 10.205.48.0/24

Known via "ospf 1", distance 110, metric 49, type intra area

Last update from 10.205.49.34 on Serial4/0, 00:02:35 ago

Routing Descriptor Blocks:

10.205.49.113, from 10.220.48.254, 00:02:35 ago, via Serial4/3

Route metric is 49, traffic share count is 1

* 10.205.49.34, from 10.220.48.254, 00:02:35 ago, via Serial4/0

Route metric is 49, traffic share count is 1

10.205.248.2, from 10.220.48.254, 00:02:35 ago, via Serial4/2

Route metric is 49, traffic share count is 1

Re: OSPF loadbalancing

From the output the router is already loadbalancing across 3 links

are you concerned about the 4th link that is not showing in the above output?

if yes , then please post the ospf anf interface configurations

Narayan

Community Member

Re: OSPF loadbalancing

4th link is down now

traffic is not going through every link

interface Serial4/0/3

bandwidth 2048

ip address 10.205.49.113 255.255.255.252

encapsulation ppp

load-interval 60

priority-group 1

serial restart-delay 0

!

interface Serial4/0/4

bandwidth 2048

ip address 10.205.49.117 255.255.255.252

encapsulation ppp

load-interval 60

shutdown

priority-group 1

serial restart-delay 0

interface Serial1/0/5

bandwidth 2048

ip address 10.205.49.34 255.255.255.252

encapsulation ppp

ip route-cache policy

ip route-cache flow

no ip mroute-cache

load-interval 60

priority-group 1

serial restart-delay 0

compress predictor

interface Serial0/1/5

bandwidth 2048

ip address 10.205.248.2 255.255.255.252

encapsulation ppp

ip route-cache policy

ip route-cache flow

no ip mroute-cache

load-interval 60

priority-group 1

serial restart-delay 0

compress predictor

!

ratelimit is present on 2 links

Community Member

Re: OSPF loadbalancing

Is there a reason Serial4/0/4 is shut down?

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