CISCO 2505 Serial interface keeps going down 1

[JonathanBKNY]

Hello everyone.

Im having an issue here. I have connected 3 routers together for some basic router simulations to work on my CCENT cert.

I have 3 2505's all running the same ver of IOS (c2500-is-l.123-12) Router 1 is connected on both s1 & s2 interfaces to the s0 of the other 2 2505's. I have connectivity from router 1 to router 2&3 and from router 2 to router 1. I also get connectivity from router 3 to router 1 but I cannot ping or telnet to router 2. The protocol on s1 of router 1 keeps dropping. I have tried so many things.I have toggled shutting the port on and off and the protocol comes up for a few seconds but then goes away again... Im lost.

Any suggestions.

 

[burtsbees]

Clock rate set on DCE? Post the configs...

Burt

 

[JonathanBKNY]

Clock rate is 1000000

I will post the configs shortly as I am in the process of redoing the configs

But the cable is essentialy the same on both sides correct? DB60 to DB60?

Is there a correct sequence when booting that would cause my DCE side to think that it is not a DCE/side any more?

Jonathan

 

[JonathanBKNY]

Burt

Here are the router configs
------------------------------------------------------------
First router config

Indianapolis#sho run
Building configuration...

Current configuration : 1311 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Indianapolis
!
boot-start-marker
boot-end-marker
!
enable password Colts
!
no aaa new-model
no ip subnet-zero
no ip domain lookup
ip host Seattle 192.168.10.2
ip host New_England 192.168.20.2
!
!
!
!
hub ether 0 1
link-test
auto-polarity
!
hub ether 0 2
link-test
auto-polarity
!
hub ether 0 3
link-test
auto-polarity
!
hub ether 0 4
link-test
auto-polarity
!
hub ether 0 5
link-test
auto-polarity
!
hub ether 0 6
link-test
auto-polarity
!
hub ether 0 7
link-test
auto-polarity
!
hub ether 0 8
link-test
auto-polarity
!
interface Ethernet0
description Indianapolis Colt_Ethernet
ip address 192.168.1.200 255.255.255.0
ip directed-broadcast
!
interface Serial0
description Serial WAN Connection to Seattle
ip address 192.168.10.1 255.255.255.0
ip rip triggered
no ip split-horizon
clockrate 1000000
!
interface Serial1
description Serial WAN Connection to New_England
ip address 192.168.20.1 255.255.255.0
no ip split-horizon
clockrate 1000000
!
router rip
network 192.168.1.0
network 192.168.10.0
network 192.168.20.0
neighbor 192.168.10.2
!
no ip http server
ip classless
!
!
!
!
line con 0
line aux 0
line vty 0 4
password Colts
login
!
end
------------------------------------------------------------Config for Second Router
Seattle#sho run
Building configuration...

Current configuration : 1142 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Seattle
!
boot-start-marker
boot-end-marker
!
enable password Hawks
!
no aaa new-model
no ip subnet-zero
no ip domain lookup
ip host Indianapolis 192.168.10.1
ip host New_England 192.168.20.2
!
!
!
!
hub ether 0 1
link-test
auto-polarity
!
hub ether 0 2
link-test
auto-polarity
!
hub ether 0 3
link-test
auto-polarity
!
hub ether 0 4
link-test
auto-polarity
!
hub ether 0 5
link-test
auto-polarity
!
hub ether 0 6
link-test
auto-polarity
!
hub ether 0 7
link-test
auto-polarity
!
hub ether 0 8
link-test
auto-polarity
!
interface Ethernet0
description Hawks_Ethernet
ip address 192.168.2.200 255.255.255.0
ip rip advertise 2
!
interface Serial0
description Serial WAN Connection to Indianapolis
ip address 192.168.10.2 255.255.255.0
ip rip advertise 2
!
interface Serial1
no ip address
shutdown
!
router rip
timers basic 2 180 180 240
network 192.168.2.0
network 192.168.10.0
!
no ip http server
ip classless
!
!
!
!
line con 0
line aux 0
line vty 0 4
password Hawks
login
!
end
------------------------------------------------------------
Here is the config for the third router
New_England#sho run
Building configuration...

Current configuration : 1198 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname New_England
!
boot-start-marker
boot-end-marker
!
enable password Pats
!
no aaa new-model
no ip subnet-zero
no ip domain lookup
ip host Seattle 192.168.10.2
ip host Indianapolis 192.168.20.1
!
!
!
!
hub ether 0 1
no link-test
no auto-polarity
shutdown
!
hub ether 0 2
no link-test
no auto-polarity
shutdown
!
hub ether 0 3
no link-test
no auto-polarity
shutdown
!
hub ether 0 4
no link-test
no auto-polarity
shutdown
!
hub ether 0 5
no link-test
no auto-polarity
shutdown
!
hub ether 0 6
no link-test
no auto-polarity
shutdown
!
hub ether 0 7
no link-test
no auto-polarity
shutdown
!
hub ether 0 8
no link-test
no auto-polarity
shutdown
!
interface Ethernet0
description Pat_Ethernet
ip address 192.168.3.200 255.255.255.0
!
interface Serial0
description Serial WAN Connection to Indianapolis
ip address 192.168.20.2 255.255.255.0
!
interface Serial1
no ip address
shutdown
!
router rip
network 192.168.3.0
network 192.168.20.0
!
no ip http server
ip classless
!
!
!
!
line con 0
line aux 0
line vty 0 4
password Pats
login
!
end

So since I did everything over, I have connectivity for everything again.

WEIRD!!!!!

 

[CiscoGuy33]

JonathanBKNY,

You said - "But the cable is essentialy the same on both sides correct? DB60 to DB60?" No one side should be marked "DCE" and gets the clockrate and the other end should be marked "DTE". It is normally "molded" into the thick end piece!

Look at the cables and look for the marking - I have some that it is "molded" into the connector and others that it is on tape close to the end!

Hope that helps!

E.A. Broda
CCNA, CCDA, CCAI, Network +

 

[CiscoGuy33]

JonathanBKNY,

You can also run the command "show controller serial x" - it will tell you if it is the "DCE" connected or "DTE" connected.

Here is a good picture of a DCE to DTE (DB60) cable where you can see the "DCE" and "DTE" molded into the end -

http://www.pccables.com/71005.htm

E.A. Broda
CCNA, CCDA, CCAI, Network +

 

[burtsbees]

Indianapolis(config)#ip route 192.168.3.0 255.255.255.0
192.168.20.2
You will need that with no split horizon. Also, I see no clock rate in any serial interfaces...

Burt

 

[CiscoGuy33]

Burt,

He has them on Indianapolis -

interface Serial0
description Serial WAN Connection to Seattle
ip address 192.168.10.1 255.255.255.0
ip rip triggered
no ip split-horizon
clockrate 1000000
!
interface Serial1
description Serial WAN Connection to New_England
ip address 192.168.20.1 255.255.255.0
no ip split-horizon
clockrate 1000000



E.A. Broda
CCNA, CCDA, CCAI, Network +

 

[JonathanBKNY]

Ok well that all makes alot of sense. The guy I purchased the kit from included the two cables. And they are Cisco branded cables and nope they are not marked anywhere. I went over them with a fine toothed comb and a magnifying glass... Ok well, yet again I feel like a dope!!!!

I marked the cables myself and everything is fine now..

Thansk again Burt and CiscoGuy33

Jonathan

 

[burtsbees]

Just remember about what "no ip split-horizon" does. Sorry I missed the clock rate...those serial interfaces will go faster than 1MB---they go 1.536MB. I always set mine to 4000000.

Burt