What is equal cost load balancing in OSPF?
Like other dynamic routing protocols, OSPF does equal cost load balancing, and if you have routes with equal cost paths to the same destination, then OSPF will do load sharing. Unlike Enhanced Interior Gateway Routing Protocol (EIGRP), OSPF can’t do unequal cost load balancing.
What is equal and unequal load balancing?
Routes with lowest metric get installed in the routing table by default, if two or more routes having the same metric the router will install both the routes in the routing table this is called equal cost load balancing.
What is the advantage of unequal cost load balancing?
the capability to do unequal-cost load balancing, the capability to load-balance traffic over multiple paths that do not have the same metric to the destination. The advantage of this feature is that it offers the flexibility of load balancing, thus making more efficient use of the link.
What is equal cost?
Equal-cost multi-path routing (ECMP) is a routing strategy where packet forwarding to a single destination can occur over multiple best paths with equal routing priority. Multi-path routing can be used in conjunction with most routing protocols because it is a per-hop local decision made independently at each router.
What is ECMP used for?
Equal-cost multipath (ECMP) is a network routing strategy that allows for traffic of the same session, or flow—that is, traffic with the same source and destination—to be transmitted across multiple paths of equal cost.
How does unequal cost load balancing in OSPF?
In order to enable OSPF unequal-cost load balancing, you use the bandwidth command on the interface. This command might not represent the actual speed of the link, so it can be used to manipulate how data is load-shared over different links with varying speeds.
What algorithm is used by OSPF if equal cost routes exist?
Packets are then routed along the shortest path using the shortest-path-first (SPF) algorithm. If multiple equal-cost paths exist between a source and destination address, OSPF routes packets along each path alternately, in round-robin fashion.
Does OSPF do unequal cost load balancing?
OSPF defaults to equal-cost load balancing. In other words, it load-shares across equal-cost links only. In order to enable OSPF unequal-cost load balancing, you use the bandwidth command on the interface.
How do you configure equal cost load balancing in EIGRP?
Configure Load Balancing on Cisco EIGRP using Unequal Routes
- Examine the current best route to the destination. On the originating router, use command show ip route [destination IP] to show the best route to reach the destination IP.
- Identify EIGRP Feasible Successor (FS) routes.
- Configure the variance value.
Does OSPF support unequal cost load balancing?
Which routing protocol can supports unequal cost load balancing?
EIGRP is the only routing protocol that supports load balancing across unequal cost paths.
What is equal cost route?
What is ECMP and how does it work?
Does EIGRP support equal cost load balancing?
By default, EIGRP supports equal-cost load balancing over four links. Equal-cost means that multiple routes must have the same metric to reach the destination, so that router can choose to load balance across equal cost links.
What is ISIS protocol in networking?
Intermediate System to Intermediate System (IS-IS, also written ISIS) is a routing protocol designed to move information efficiently within a computer network, a group of physically connected computers or similar devices. It accomplishes this by determining the best route for data through a packet switching network.
Does OSPF support unequal load balancing?
No, OSPF does not support routing over unequal costs paths.