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CCNA lab with 2500 series prob

I have a little prob that seems to me a router not config prob.

I have set up a 2522 to a 2503.Both by serial 0 with a crossover CAB-HD60MMX cable.

The trouble I am having is when I set up these prts with ip's and igrp with a no shutdown command both interfaces they change state to up and protocol to up.

I can then do a show ip interface brief and get the right results.I can then do a

show ip route and get the right result.

Then after a minute or so both line protocols go down.This does not happen with the router sims so I suspect that it is one of the routers or the cable.(Although I have tried 3 cables.)

I have shown below what is going on from Router 2 below.The same happens on R1.

I'm a little lost so if you can help out..please do.

R2#

%LINK-3-UPDOWN: Interface Serial0, changed state to down

%LINK-3-UPDOWN: Interface Serial0, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed state to down

%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed state to up

R2#sh ip route

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP

i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default

Gateway of last resort is not set

C 192.168.1.0 is directly connected, Serial0

R2#ping 192.168

%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed state to down

% Unrecognized host or address, or protocol not running.

R2#ping 192.168.1.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

R2#sh ip interf breif

^

% Invalid input detected at '^' marker.

R2#sh ip interf brief

Interface IP-Address OK? Method Status Protocol

BRI0 unassigned YES not set administratively down down

Ethernet0 192.168.2.1 YES manual up down

Serial0 192.168.1.2 YES manual up down

Serial1 unassigned YES not set administratively down down

R2#

Ta

4 REPLIES
New Member

Re: CCNA lab with 2500 series prob

Have you set the 'clock rate' on the DCE side of the link ?

e.g clock rate 56000

Phil.

Re: CCNA lab with 2500 series prob

HI

If i understand u u r trying to connect the two routers in back-to-back scenario.for this to accomplish u need to have one ned of router as a DCE and other as a DTE and make sure u r using the correct type of encapsulation on both the ends and u need to provide clock-rate at the DCE interface.I hope ur having a DCE-DTE back to back cable.

Thanks

Mahmood

New Member

Re: CCNA lab with 2500 series prob

I am using DCE-DTE crossover cable or back to back.

Thanks for your help guys.I think the clock rate is the prob.Will look into it further and get back to you on how it goes and the answer,

Thanks

New Member

Re: CCNA lab with 2500 series prob

Yeah with a clock rate of 4000000 I get around 2.24Mb/s.

So yes it all worked fine.Thanks for every thing.

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