What is feasible successor in EIGRP?
A feasible successor is a backup path to reach that same destination that can be used immediately if the successor route fails. For a route to be chosen as a feasible successor, one condition must be met: the neighbor’s advertised distance (AD) for the route must be less than the successor’s feasible distance (FD).
What is SIA in EIGRP?
EIGRP is a reliable protocol and for each query a router sends to its neighbors it must get a reply in response within 3 minutes. If the router does not receive a reply to ALL its outstanding queries it will put the route in SIA (Stuck in Active) state and will kill the neighbor adjacency.
What is a feasible successor?
A feasible successor is a backup route that can be used in the event of a topology change without having to recalculate routes. The feasible successor can be used instantly, which means convergence time is instantaneous.
How many feasible successor kept in EIGRP topology table?
We can tell from this output that there is only one successor route, through R5 (with a feasible distance of 3072), but the secondary route through R4 is being held as a feasible successor.
What is the benefit of having a feasible successor route with EIGRP?
One of the advantages of EIGRP Feasible Successor is that it speeds up the EIGRP. In fact, if there is a Feasible Successor in the EIGRP network, such network converges faster than OSPF or IS-IS.
What is SIA stuck in active?
SIA means stuck in active.It is generated after 90 seconds of Query message. If reply is not received up to 90 seconds it will send Stuck in Active Query to neighbor router.
What is the difference between HSRP and VRRP?
The primary difference between HSRP versus VRRP would be that HSRP is proprietary to Cisco and can only be used on Cisco devices. VRRP is a standards based protocol and is vendor independent allow some flexibility when choosing network devices.
Where are EIGRP successor routes stored in?
Successor routes are saved in the topology table to be used if the primary route fails. Successor routes are flagged as “active” in the routing table. A successor route may be backed up by a feasible successor route. Successor routes are stored in the neighbor table following the discovery process.
Which command will display all the EIGRP feasible successor?
Solution(By Examveda Team) Any secondary route to a remote network is considered a feasible successor, and those routes are only found in the topology table and used as backup routes in case of primary route failure. You can see the topology table with the show ip eigrp topology command.
Where are EIGRP successor routes stored?
How do you establish EIGRP neighbor relationships?
Two routers must use same K Values in order to become the EIGPR neighbor. For example if one router is using three K- Values (K1, K2 and K3) while second router is using default K values (K1 and K3) then these two routers will never become neighbor. In order to become EIGRP neighbor two routers must use same K values.
Where does the feasible successor go in EIGRP?
This route will be placed in the routing table. feasible successor – alternative routes to a particular network that can be used immediately if the currently best route (the successor) fails, without causing a routing loop. These routes are stored in the EIGRP topology table.
What does Sia mean on an EIGRP router?
The SIA state means that an EIGRP router has not received a reply to a query from one or more neighbors within the time allotted (approximately 3 minutes). When this happens, EIGRP clears the neighbors that did not send a reply and logs a DUAL-3-SIA error message for the route that went active.
Which is the best successor or feasible successor?
The successor is the best route to a given network. It’s what you will see in the routing table output of show ip route. It has the best metric to that network. A feasible successor is a backup route. This is an important concept in EIGRP – a backup route can be used IMMEDIATELY if the primary route (the successor) goes down.
When is a route entered as a feasible successor?
A route is entered into the EIGRP topology table as a feasible successor only if it meets the feasibility condition, which asserts that the reported distance of a route must be lower than the feasible distance of the current successor route. To better illustrate this concept, consider the following scenario.