Questions tagged [eigrp]

Use this tag for questions about Cisco's EIGRP - Enhanced Interior Gateway Routing Protocol.

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Packet Tracer 7.2.1 does not support eigrp for ipv6

I'm trying to enable eigrp for ipv6 in packet tracer but is seems to only have ospf and rip for ipv6. Is this a recent limitation?
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1answer
39 views

EIGRP unequal load balancing, variance command

Is correct to say that the value inserted in the variance command, lets say the value of "2" on a route that has a cost of, lets say "100", will unequally load balance all routes up to a cost of 200 ? ...
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1answer
86 views

EIGRP Auto-summary

One more question about EIGRP, EIGRP auto-summary what is the impact on the network ? i was reading about but it was not clear for me. And why is it a good Cisco practice to be disabled ? I am ...
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1answer
42 views

EIGRP metric claculation

I have a question regarding the EIGRP metric system. so if K1 is the Bandwidth and formula is : (K1 * BW + ((K2 * BW) / (256 - LOAD)) + K3 * DELAY ) * (K5 / (RELIABILITY + K4) Whats is BW and ...
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331 views

Why does EIGRP aim to be loop free?

As far as I understand: EIGRP is a routing protocol and handles IP packets. IP packets are outfitted with the TTL field and thus, do not loop indefinitely like layer 2 frames do. Why does EIGRP try ...
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77 views

Cisco numeric EIGRP routing IP summarizing and routing

I have 2 routers connected via Serial 0/0/0 both running EIGRP with an ASN of 65000, and i want to advertise and summarize the interfaces, being just my loopbacks, and set the loopbacks as passive. ...
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1answer
354 views

Is it possible to remove/block a EIGRP neighbors connection via Switch?

I have a 4 routers that connected each other via an multilayer switch. Is it possible to remove/block an EIGRP neighbors via Switch? For example, I have a topology like this : I wanted to remove ...
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2answers
214 views

EIGRP Routing Issues

I had an issues about EIGRP. But first, here's the topology : I've done EIGRP Routing, but it's kinda strange. PC0 -> PC1 is able to ping, PC3 -> PC2 is able to ping. But, I can't ping PC0 -> PC2, ...
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1answer
57 views

Why Static route (AD=150) and EIGRP route coexist under “show ip route”?

pic1 is topology pic2 is routing table. EIGRP is enabled with auto summary, why there is a static router (AD=150)?
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1answer
321 views

EIGRP authentication on GRE tunnel interface?

I want to implement authentication on EIGRP updates. Can I enable EIGRP authentication on a GRE tunnel interface instead of physical interface?
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1answer
764 views

Why does EIGRP have lower Administrative distance than OSPF?

I have given the following network diagram and been told that, Since EIGRP has a better (lower) administrative distance than OSPF, the router on the far left will use the EIGRP path and publish ...
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1answer
53 views

Filter routes based on interface

In EIGRP is there a way to filter routes entering from a specific interface? The intent is to protect the network core's routing table from receiving misconfigured or maliciously-inserted routes from ...
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251 views

Cannot see the differende between distance-vector and link-state

At link-state routing protocols each router advertises every link he knows about to the next router, which again advertises his links and so on until every router knows all links in his area. So every ...
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548 views

Will an EIGRP route be chosen over an OSPF route regardless of metrics?

I am sure this has been asked SOMEWHERE but I can't find it anywhere. Question is simple: Will R1 chose the EIGRP route to R4 over the OSPF route, even though the OSPF route is clearly the better ...
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1answer
54 views

EIGRP manual summarization prevent dual query

In EIGRP, manual summarization will prevent/ limit dual query. Is it true ? How can we limit the dual query by introducing manual summary ?
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2answers
451 views

BGP update source basics

I have the following test lab: The configuration of 'King' is: King#sho ip int bri Interface IP-Address OK? Method Status Protocol FastEthernet0/0 192....
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2answers
549 views

No passive-interface error

I'm trying to nest some EIGRP configurations on a router in GNS3. I'm trying to connect the EIGRP 2801 in SW01 to RTR-01 and EIGRP 2864 to RTR-02 when I do. When I put no passive-interface ...
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2answers
92 views

EIGRP neighbors discovering process

Quick question regarding EIGRP, as far I know, EIGRP has two tables: neighbors, and topology, and the router has its routing table obtained with DUAL algorithm applied to the topology table. ...
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2answers
310 views

EIGRP failover - how do i verify it happened?

I have 2 links to a destination and EIGRP was setup. The faster link is the successor and the slower link is the feasible successor. Switch1#show ip eigrp topology 192.168.1.0 EIGRP-IPv4 Topology ...
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147 views

How does Cisco router know the sum of delays in eigrp?

I know one can use sh ip route command example below, (r1) s2/0 -- s2/0 (r3) -- lo0 (r3) so the delay from r1 to r3 lo0 would be sum of delay on s2/0 and delay on lo0 on r3. it's easy for a ...
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1answer
317 views

c5915 DMVPN Spoke ISP Failover- Single Hub

I have a mobile application that utilizes cellular and satcom services to form a VPN connection to our hub. In the current configuration, failover works based on the ip hello-interval eigrp 1 15, ip ...
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1answer
44 views

Why does EIGRP not use Feasible Distance to determine the feasible successor

For EIGRP to determine a successor (best route), it uses the route with the lowest number of Feasible Distance(FD). And to determine the feasible successor (which is the backup route or the next best ...
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1answer
1k views

When do we need metric calculations when redistribute EIGRP to OSPF and vice versa?

I am a newbie, and I'm curious. When do we need to calculate metrics on redistributing EIGRP to OSPF and vice versa. My practice use Cisco, type a command redistribute EIGRP 1 metric ... I'm confused. ...
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3answers
3k views

How do OSPF and EIGRP deal with 2 exactly same routes?

If you refer this diagram, Will ospf and eigrp share the 10 network on the right to their neighbors? I am asking the question in two separate scenarios using a single protocol at a time and not ...
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2answers
674 views

Preventing Load balancing in EIGRP

In a recent project, I have been told to consider four Hubs (two in HQ, and two in DR), where each branch will have EIGRP neighborships with all four, as part of a DMVPN based WAN. I have tested this ...
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2answers
994 views

BGP problems, cannot ping

I'm beginner, and I have problems with BGP. I don't really understand why it doesn't work correctly. This is my topology: I need to ping from R8 to R10. This is the configuration of R8: ! ! ...
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1answer
339 views

A question about the router ID for EIGRP

If I configure a loopback interface and then set a router id by typing, eigrp router-id 10.0.0.1, for example, and the router protocol is EIGRP, what will be the accurate id for this router if the ID ...
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1answer
213 views

Handling multiple redundant Metro Ethernet circuits in one location

We have recently signed up for Metro Ethernet for our main campus and 8 branches. It's a "mesh" with the carrier providing a virtual layer-2 switch in the cloud. I have a Cisco router at each site ...
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1answer
113 views

EIGRP protocol convergence

When EIGRP loses Successor route and transfers to Feasible Successor route does it calculate another Feasible Successor right away? So the first Feasible Successor becomes the Successor and new FS is ...
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1answer
79 views

Adding 2nd EIGRP route to Data Center

I am adding a 2nd layer 3 link between data centers using EIGRP. I want the remote sites to continue to use the 100 Mb to routes that are in Data Center 2 (unless the link is down). If I'm correct ...
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1answer
160 views

Difference in convergence time IPv4 vs IPv6

Using protocols like RIP, OSPF and EIGRP, would IPv6 converge faster in smaller network like 4 routers? Would it differ in bigger networks?
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2answers
838 views

EIGRP neighbor problem

Why is R1 giving these error messages? IP-EIGRP(Default-IP-Routing-Table:400): Neighbor 192.168.2.1 not on common subnet for FastEthernet1/0 IP-EIGRP(Default-IP-Routing-Table:400): Neighbor 192.168....
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4answers
996 views

Choosing a routing protocol

I have always wondered what causes an network engineer to pick EIGRP or OSPF over the other. Obviously OSPF is opened standard so can be used in a multi-vendor environment. If all equipment was cisco, ...
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2answers
4k views

How to connect different networks based on vlans using layer 3 switches and router?

This is a simplified version of my network diagram. How do I make both network speak to each other? I'm confused because earlier I used routers and switches, and I connected them using OSPF or EIGRP....
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1answer
54 views

How to use network correctly on router protocols?

I was watching a video talking about EIGRP protocol and got confused in the network part. The part of the topology was: R1 e0/1, with IP of 10.1.12.1/24 connected on R2 e0/0, with IP of 10.1.12.2/24 ...
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1answer
665 views

Discontiguous Addresses in IP Subnets

What are the reasons for using only contiguous addresses in subnets? Will something malfunction if we use dis contiguous IP addresses? I am aware that RIP and IGRP will auto-summarize which results ...
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0answers
389 views

Dual-Hub DMVPN Outage

Our backup links have always utilized a GRE tunnel based VPN to a hub. Recently we installed a second hub and migrated the primary links to GRE tunnel based VPN with EIGRP to handle routing between ...
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1answer
56 views

EIGRP delay summarization?

Could you please explain why when sending EIGR updates only delay of incomig interfaces are summarized and delay of outgoing interfaces is not considered. Please see picture below:
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1answer
201 views

Apparently variance is not working for EIGRP ..what am I missing?

Here is what my router is reporting. I set the variance to 100 just to see what is going on. This is using classic configuration and the RD for the two alternate links is 537600. If I multiply the FS (...
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3answers
3k views

EIGRP metric explanation

I'm looking for an understanding of how the metrics are structured within EIGRP, this includes the routing table, and also the topology table. I'm sure I'm not the only one that finds the concepts of ...
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1answer
552 views

Does a route need to be in the RIB in order to be redistributed?

Please can anyone help me confirming something : Is every protocol (OSPF, RIP, EIGRP,BGP) needs to have the route in the RIB in order to be able to REDISTRIBUTE it into another protocol ? Is there any ...
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1answer
869 views

eigrp load balacing - per packet or per destination

Assume i have no cef enabled and there are 2 paths with the same cost ( both traffic share count = 1) Router#show ip route 20.20.20.1 Routing entry for 20.20.20.0/24 Known via "eigrp 10", distance ...
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3answers
1k views

Why am I seeing two different values for Feasible Distance?

I was playing with an EIGRP Lab in GNS3, and came across a very weird oddity. Here is the topology: Here is the oddity: R2# show ip eigrp topology <~-~-~ output ommitted ~-~-~> P 10.4.5.0/24, ...
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1answer
70 views

In what situations would the EIGRP process use the default 50% of the configured interface bandwidth?

I am in a class which conforms to the material in the Cisco Companion Guides, and I am currently using the Scaling Networks textbook. In it, the book explains how to adjust the percentage of ...
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1answer
880 views

Cisco Nexus 5k EIGRP Configuration

I have two Cisco Nexus switches with EIGRP Routers. Switch 1: SWITCH1(config-if)# sh run !Command: show running-config !Time: Sun Feb 21 05:29:57 2016 version 5.0(3)U5(1f) no feature telnet no ...
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2answers
320 views

How does EIGRP determine the path to far away destinations?

10.0.10.0/24 10.0.11.0/24 192.168.178.0/24 R1 ╚════════════╝ R2 ╚════════════╝ R3 ╚════ R3 LAN ════╝ In OSPF each router knows the full topology, so it uses the Dijkstra algorithm to ...
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0answers
223 views

EIGRP adjacency “forward” through DMVPN router not supporting EIGRP [closed]

I have a Cisco 819 with 4G which is a "spoke" and has a layer 3 DMVPN connection to the "hub." This (C819HG-4G-V-K9) router does not support EIGRP, therefore I cannot establish adjacency to the DMVPN ...
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2answers
2k views

Why do summary routes get a low Administrative Distance?

Why do summary routes get a lower AD than other routing protocols? For example: The AD of EIGRP is 90, whereas the AD of a summary route is 5.
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1answer
583 views

Why can't I ping in this situation?

This is the topology As you can see routers and switches are all named out, so I will use those names to explain the issue. First of all this network consists of VLANs, WANs running on EIGRP and ...
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1answer
290 views

Advantages of hierarchy system on Routing Protocols

The OSPF has a hierarchy system that separates a single Autonomous System into individual areas, while EIGRP has not a hierarchy system, it prefer to handle with an entire Autonomous System, right? ...