Questions tagged [eigrp]
Use this tag for questions about Cisco's EIGRP - Enhanced Interior Gateway Routing Protocol.
129
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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: ...
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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 ...
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What is the MTU used for in EIGRP? [duplicate]
A lot of sources mention that MTU is included in the EIGRP packets but is not actually used for any path selection calculations. I've also read somewhere that it was supposed to be used as a ...
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82
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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 ...
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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 ...
- 285
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645
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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 ...
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33
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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 ...
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129
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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 ...
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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 ...
- 21
3
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126
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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 ...
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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 ...
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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....
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144
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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 -
+-------------+ ...
- 687
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446
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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 ...
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338
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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 ...
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148
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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 ...
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157
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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 ...
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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...
...
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80
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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 ...
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143
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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 ...
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40
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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....
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247
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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 ...
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49
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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 ...
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46
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EIGRP : Feasibility Condition not satisfied
What happen if the Feasibility Condition not satisfied and we can not pick a feasible successor?
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140
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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 ...
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190
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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. ...
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answers
336
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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 ...
- 145
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995
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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 ...
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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 ...
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727
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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, ...
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74
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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 ...
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144
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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 ...
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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
...
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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?
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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 ...
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76
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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 ...
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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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590
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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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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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134
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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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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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97
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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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2k
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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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2
answers
879
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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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117
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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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540
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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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1k
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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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76
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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 ...
- 666
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525
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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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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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