cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
807
Views
0
Helpful
1
Replies
MANGODZILLA
Beginner

Status UP , Protocol DOWN - 2811 Router on Cisco Packet Tracer

Good evening everyone and thanks for joining this post.

I was about to explore in Packet Tracer lab the EIGRP protocol, since I'm deep diving in it in these days.

 

I've created a topology with 8 networks and while I was connecting some of the routers, I stumbled across someting strange to me: only two of the many links connected refuses to go up.

They stay red and down despite the ip configuration is correct and despite I've tried many times to configure them from scratch.

 

cpt.PNG

 

Let's take for example the 10.111.111.8/30 network (R3 Fa1/0 - R4 Fa1/0) on the right.

 

R3(config)#do show ip int brief
Interface              IP-Address      OK? Method Status                Protocol 
FastEthernet0/0        10.3.3.1        YES NVRAM  up                    up 
FastEthernet0/1        10.111.111.6    YES NVRAM  up                    up 
FastEthernet1/0        10.111.111.9    YES manual up                    down 
Vlan1                  unassigned      YES NVRAM  administratively down down
R3(config)#
R4(config)#do show ip int brief
Interface              IP-Address      OK? Method Status                Protocol 
FastEthernet0/0        10.4.4.1        YES NVRAM  up                    up 
FastEthernet0/1        10.111.111.13   YES NVRAM  up                    up 
FastEthernet1/0        10.111.111.10   YES manual up                    down 
Vlan1                  unassigned      YES NVRAM  administratively down down
R4(config)#

It seems weird to me, considering that all other interfaces of all other routers just went flawlessly up and working at the first configuration shot.


## EDIT ##

Found a workaround by adding a switch in the middle of a broken link, that started working: this confuses me even more.


cat.PNG

##END EDIT##

 

This is the Packet Tracer file:
https://mega.nz/file/eJpWAazS#e8Ol3u8tGUEq-EvDKD_QGo0H7Y30wQG_Cb0936422So

Many thanks in advance for your help in this matter.


Greetings.

1 ACCEPTED SOLUTION

Accepted Solutions
MANGODZILLA
Beginner

After some tries I figured out that connecting the aforementioned routers with a crossover cable did the trick.

View solution in original post

1 REPLY 1
MANGODZILLA
Beginner

After some tries I figured out that connecting the aforementioned routers with a crossover cable did the trick.

View solution in original post