From: Huan Pham (Huan.Pham@peopletelecom.com.au)
Date: Sun Aug 10 2008 - 01:28:58 ART
It looks like that this is a clocking issue (Layer1). It is not L3
config.
In a typical lab setup at Layer 1, FR switch should be DCE side, and
should provide clocking toward your R1 router.
However, if for some reason, the DB60 back to back cable is removed and
connected back, and the technician is not careful, who mistakenly
swapped the two ends, the DCE side of DB60 back to back cable may be on
your R1 router. In this case you should provide clocking toward FR
switch. Try show control Serial 0/0 on R1 and you will see what type of
cable (DCE or DTE) is connected to your R1.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Jonny English
Sent: Sunday, 10 August 2008 2:01 PM
To: GS CCIE-Lab
Subject: Please help
Hi, I'm having a hard time trying to see the problem here. I don't think
there is one, but I'm doing a lab on a rack rental and this is what's
happening
Rack1R1#sh ip int brief
Interface IP-Address OK? Method Status
Protocol
FastEthernet0/0 unassigned YES unset administratively
down
down
Serial0/0 191.1.125.1 YES manual up
down
Serial0/1 unassigned YES unset administratively
down
down
the serial int s0/0 is always up down. My config of the routers is
below.
All three routers R1, R2 and R5 should be connected to the frame-switch.
But for some reason on R1 the s0/0 protocol on the interface keeps
flapping. The rack rental company said it was a layer 3 issue with my
config. I stripped the config of and reloaded the routers. Then just did
the frame stuff again.
I have the same problem with R1's s0/0 interface keeps flapping. Does
anyone have any ideas on what could be wrong here? I can't for the life
of me see what is wrong with my configs. Thanks in advance.
Rack1R1#sh run int s0/0
Building configuration...
Current configuration : 243 bytes
!
interface Serial0/0
ip address 191.1.125.1 255.255.255.0
encapsulation frame-relay
no dce-terminal-timing-enable
frame-relay map ip 191.1.125.5 105 broadcast frame-relay map ip
191.1.125.2 102 broadcast no frame-relay inverse-arp end
--Rack1R2#sh run int s0/0 Building configuration...
Current configuration : 253 bytes ! interface Serial0/0 ip address 191.1.125.2 255.255.255.0 encapsulation frame-relay no dce-terminal-timing-enable frame-relay map ip 191.1.125.5 201 frame-relay map ip 191.1.125.1 201 broadcast no frame-relay inverse-arp
--
Rack1R5#$ sh run int s0/0
Building configuration...
Current configuration : 281 bytes ! interface Serial0/0 ip address 191.1.125.5 255.255.255.0 encapsulation frame-relay no dce-terminal-timing-enable frame-relay map ip 191.1.125.1 501 broadcast frame-relay map ip 191.1.125.2 501 no frame-relay inverse-arp frame-relay lmi-type cisco end
-- Thank You,
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