ospf cost

Answered Question
Jun 30th, 2009

How does traffic form source A going to destination E will be routed if ospf cost on all links are equal. Thanks

Attachment: 
I have this problem too.
0 votes
Correct Answer by Edison Ortiz about 7 years 5 months ago

It will try to load balance the traffic but it relies on CEF load balancing, so traffic is not actually equally balance across the links.

http://www.cisco.com/en/US/products/hw/modules/ps2033/prod_technical_reference09186a00800afeb7.html

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 5 (2 ratings)
Loading.
John Blakley Tue, 06/30/2009 - 12:39

If all costs (metrics) are equal, it will do equal-cost load balancing. Both routes (A-B-E and A-C-E) will show up in the routing table at the same time.

HTH,

John

cisco steps Tue, 06/30/2009 - 13:14

that is what I am trying to figure out...so 1/2 on one side and 1/2 on the other ? if yes how does the packet get reassembled at the destination.

Thanks

cisco steps Tue, 06/30/2009 - 14:58

that is the answer that I was looking for.. Thanks a lot..

If route-cache mechanisms are disabled, the route table is the only information used to forward a packet. For every packet the destination address is matched against the route table, and the packet is forwarded through the interface with the lower utilization.

Actions

This Discussion