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Questions tagged [eigrp]

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

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2 answers
184 views

Cisco ASA access-lists and net config

Here are my config to this network. I found the ASA doesn’t ping through each other. Also, when I type show crypto isakmp SA and IPSec Sa, it doesn’t show anything at all. Could you guys find what’s ...
1 vote
0 answers
116 views

Redistribution Loops and Route Tagging

I've read that when we configure multipoint redistribution, it's a good idea to tag our routes to prevent them from being advertised from Protocol 1 - Protocol 2 - Back to Protocol 1. Source: ...
1 vote
1 answer
87 views

EIGRP AS versus BGP AS

I am currently studying the basics of BGP and I am very early into this topic. So with EIGRP, I was told that an AS is basically a collection of routers/a routing domain that is under a single ...
3 votes
2 answers
370 views

In router's config, why do I need to advertise the directly connected network?

I have learned that, in routing config, a router must advertise all of its networks. For example, in this topo: Router A need to network 192.168.1.1 0.0.0.255 and network 100.1.1.2 0.0.0.255 But why ...
0 votes
1 answer
465 views

Interior vs Exterior Gateway Protocols

I'm new to Networking and I was reading about the Interior and Exterior Gateway Protocols ,but i couldn't understand some points , as stated in a reference: IGPs are designed to work in private ...
0 votes
1 answer
224 views

Doesn't OSPF Have Auto Summarization?

I asked AI if there is a command in OSPF for auto summarization like RIP and EIGRP. Here is the answer: "No, OSPF does not have a command like RIP and EIGRP that enables or disables automatic ...
0 votes
1 answer
316 views

What Is The Difference Between Using Wildcard Mask In EIGRP And In OSPF?

I noticed that in the CBT learning videos, a lot of teachers ignored using the wildcard mask when configuring the EIGRP, however, they always used it when they configured OSPF. I looked on the ...
2 votes
1 answer
671 views

When would we want to do traffic steering?

After going over EIGRP, I ran into offset lists which allow the modification of the metric of routes advertised by EIGRP and provide the option of traffic engineering. I am not very experienced with ...
0 votes
1 answer
103 views

Running multiple EIGRP processes on a router

I am studying about EIGRP at the moment and I came across the option of running multiple EIGRP processes with different autonomous system numbers on a router. I don't understand in which cases we ...
2 votes
1 answer
55 views

How to resolve or stop EIGRP continuous log message Issues [closed]

How do I stop this continuous log message because I cannot make any amendments on the router in cisco packet tracer? this is how it looks like: eq 1/0 idbQ 0/0 iidbQ un/rely 0/0 EIGRP: Received HELLO ...
2 votes
1 answer
997 views

How can I clear all EIGRP routes?

Working through NetSim, I graded my work and found that at first I put the wrong IP address in the EIGRP routing table, so I then tried adding the write one. I then tried to grade my work again, and ...
0 votes
0 answers
27 views

Can you filter specific prefixes from a redistributed EIGRP summary route?

Say I have an EIGRP router advertising the summary address 192.168.128.0/22 and on a connected router I'm redistributing EIGRP routes into OSPF. Is there any way for me to only redistribute 192.168....
0 votes
1 answer
235 views

In a PE-CE network, we would redistribute routes between BGP and IGP without `bgp redistribute-internal`. How does redistribution works?

In a PE-CE network deployment on Cisco IOS/XE devices like - +-------------+ ...
0 votes
1 answer
621 views

Why Poison Reverse is used in EIGRP routing protocol?

EIGRP uses DUAL to achieve route-loop freedom. By design DUAL ensure no route-loop in the network. Then why does EIGRP use poison reverse UPDATE when there is a topology change? Is there any other ...
1 vote
0 answers
486 views

Route-map to manipulate metric in EIGRP

I have following Setup R1 --- R2 --- R3 --- R4 --- R5 The same network is being advertised from R1 and R5. There is some difference in delay between the two paths R1-R2 and R4-R5. So the route from R1 ...
0 votes
2 answers
207 views

Ramifications of turning off Spanning Tree for EIGRP network?

Ran into something I've never seen before in a production network I'm new to supporting and wanted to get the communities take on it. I have an EIGRP network that interconnects about 60 sites across a ...
0 votes
1 answer
234 views

Why I can't ping in my network?

I have the following network: The following is my interface table: This is my PC IP address table: This is the configuration for Router ISP: ISP#show running-config Building configuration... ...
0 votes
1 answer
135 views

how to configure EIGRP in my network?

I have the following network With the following routing table: Configuration of router 1 Building configuration... Current configuration : 1056 bytes ! version 15.1 no service timestamps log ...
1 vote
2 answers
397 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 (...
0 votes
2 answers
178 views

Port 88, would Kerberos conflict with EIGRP?

So from what I understand EIGRP works on top of the IP protocol layer 3 and uses RTP to multicast address 224.0.010 on PORT 88 But Kerberos also uses UDP PORT 88 for authentication. So would there be ...
0 votes
0 answers
45 views

iBGP Question reagrding Distribute - List from EIGRP

So, I have the following topology. A-B | | C-D A-B-C-D are Routers. It doesn't matter what are the IP's of the interfaces. What matters is that I have 2 loopbacks for each router. 1.1.1.1 and 11.11....
0 votes
0 answers
305 views

Eigrp flapping while using natting with route map

I have configured a topology which contains ip sla , route map , dual natting.It work perfect but when I used route map natting the eigrp become flapping and show the error is "retry limit ...
1 vote
0 answers
68 views

Distribute list behavior on outgoing routing updates

i have this topology I'm studying route maps and pbr and distribution list , I advertise bunch of network address from R4 and R5 and R7 ,i managed to leverage route maps and distribute list to remove ...
12 votes
2 answers
12k views

Error: `EIGRP is restricted to stub configurations only on this platform`

We just bought some new Cat4507R+E distribution switches. When we bought the switches, we asked for an Advanced Services K9 image, but our reseller told us they only come with a Universal K9 image. ...
4 votes
5 answers
2k 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, ...
1 vote
3 answers
2k 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 ...
4 votes
3 answers
1k 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 ...
1 vote
2 answers
134 views

Why do we need EIGRP AS numbers when we have EIGRP RID?

I understand that the EIGRP routers need to have the same AS number to peer with each other. But why can't we just use EIGRP Router ID?
1 vote
1 answer
52 views

EIGRP : Feasibility Condition not satisfied

What happen if the Feasibility Condition not satisfied and we can not pick a feasible successor?
3 votes
2 answers
631 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 ? ...
3 votes
1 answer
77 views

EIGRP Adjacency Table

From Cisco IP Routing by Alex Zinin According to this figure Adjacency Table gets messages from DUAL module also.As far as I know, Adjacency Table is populated only because of Hello packets exchanged ...
1 vote
2 answers
181 views

Routing Protocols and sharing information

I am running multiple Protocols on different Routers as so: R1-RIPv2 EIGRP OSPF R2-OSPF and RIPv2 R3-RIPv2 and EIGRP R4-EIGRP and OSPF This is not a practical exercise, it is just to explore how ...
0 votes
1 answer
2k views

EIGRP Holding Time Expire on VLAN Interfaces

I configure 2 Layer 3 Switches with VLANs and EIGRP route. But it always return a message like this : %DUAL-5-NBRCHANGE: IP-EIGRP 2019: Neighbor 192.168.20.253 (Vlan20) is down: holding time expired ...
1 vote
2 answers
233 views

How do I enable communication between hosts on two Intranets with different routing protocols

Having completed the Networking Essentials Course from Cisco Networking Academy, I've been practicing on Packet Tracer until I came across this scenario. Supposing we have two intranets, A and B. ...
2 votes
2 answers
402 views

EIGRP advertising of routes for other networks behind us

Continuing my expedition in to trying to learn EIGRP and other routing techniques in GNS3, I now have another theoretical network, depicted below: Everything in the red area is a mystery. We do not ...
1 vote
2 answers
1k views

EIGRP route redundancy in a ring topology

Within GNS3, I am attempting to configure five Cisco 3660 routers in a ring topology with EIGRP, as an early exercise to try and learn how to use EIGRP: These routers and virtual PCs are configured ...
0 votes
1 answer
2k views

EIGRP to BGP to EIGRP

I would like to ask if it is possible to implement eigrp routing sent through bgp? I wanted to route from PC-1 to PC-2 using EIGRP. The connection between all of the three routers are through BGP ...
0 votes
2 answers
871 views

If EIGRP is designed to work within same autonomous system, why it has concept of multiple ASN?

EIGRP is a CISCO proprietary protocol and a type of Interior Gateway Protocol, which replaced now obsolete Interior Gateway Routing Protocol. This protocol like every other interior routing protocol, ...
1 vote
1 answer
79 views

Filter tagged route to downstream routers

I'd like to filter a redistributed route from EIGRP into OSPF to all routers in AREA2 and AREA34. I have tagged the route 10.90.100.0/24 with tag 90 at the Tampa router where its redistributed into ...
2 votes
1 answer
264 views

How to check the route table on a neighboring router?

I have a router in a network, which use to show list of routes in the route table. Using the command- show ip eigrp topology I see some of the routes are removed after sometime, which were advertised ...
1 vote
1 answer
98 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. ...
2 votes
2 answers
492 views

How to ping from PC on EIGRP area to PC on OSPF area without middle router?

This is my topology. And I can send a package to every router and PC within the colored area, how can I ping from a PC on EIGRP area to a PC on the OSPF area? I heard about default route but I saw it ...
0 votes
1 answer
68 views

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?
10 votes
2 answers
6k views

Why does the MTU need to match on interior link state routing protocols like EIGRP and OSPF?

If one tries to configure the neighbor adjacencys without matching MTU, The routers fail to become neighbors. I assume this is to protect the routing protocol from it self but I don't understand ...
3 votes
1 answer
120 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 ...
1 vote
1 answer
148 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 ...
1 vote
1 answer
479 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 ...
1 vote
1 answer
91 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 ...
1 vote
1 answer
113 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:
2 votes
1 answer
174 views

This is an EIGRP Topology with frame relay. I'm not able to figure out why R1's topology table doesn't a show feasible successor for 192.168.2.0/24

P 192.168.1.0/24, 1 successors, FD is 2730496 via 172.16.124.2 (2730496/2218496), Serial3/0 via 172.16.124.3 (3193856/2681856), Serial3/0 P 192.168.2.0/24, 1 successors, FD is 2681856 ...