07-31-2003 02:38 PM - edited 03-02-2019 09:16 AM
I using cisco2511 on both side ( head office & branch ). Connecting Leaseline via DSU. They can't connect to each other ( try by ping on the router to another router side ) . I have a problem about serial interface,protocal is down ( down on both side ).
encapsulation : ppp ( both )
head : 192.168.2.1/30
branch : 192.168.2.2/30
=============================================
Serial1 is up, line protocol is down
Hardware is HD64570
Description: connected to Microsys
Internet address is 192.168.2.1/30
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, loopback not set, keepalive set (10 sec)
LCP Listen
Closed: IPCP, CDPCP
Last input never, output 00:00:26, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0 (size/max/drops); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
37 packets output, 2409 bytes, 0 underruns
0 output errors, 0 collisions, 10 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
=============================================
i've try to use encap hdlc on both side , it's still protocal down too.
i contact to link provider for check the line and signal, they've check and said that nothing wrong about the line and signal.
I try to test local loop ( push CSU "local" button ), protocal is up (looped).
I try to test remote loop ( push CSU "remote" button ), protocal is up (looped).
But when i turn off loop test, protocal is down again.
please help me how to correct this ?
08-01-2003 04:49 AM
can you paste in a sh ver
08-01-2003 06:05 AM
could be a clocking issue. Does sho cdp see anything? Can you get a show int from the other side?
08-01-2003 06:14 AM
Can you do a show controllers s1 for both sides if they are both on the same serial interface. Then in the output about a 1/4 way down make sure you see cable connected. Then at the bottom is your line information for XTR and Rec.
08-01-2003 07:33 AM
First, I am assuming that the service provider is the clock source in which case you will have to set your DSU to receive the clocking signals. What kind of DSU do you have? If it is a Kentrox DataSmart DSU select clock source to "loop".
Also ensure that the framing format [usually ESF], line coding [usually B8ZS] and number of T-1 channels on the DSU are the same on both sides.
Did you try swapping the V.35 cables?
HTH,
Rajesh
08-01-2003 09:15 AM
Cisco2511#show cdp interface
Ethernet0 is up, line protocol is up
Encapsulation ARPA
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
Serial0 is administratively down, line protocol is down
Encapsulation HDLC
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
Serial1 is up, line protocol is down
Encapsulation PPP
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
===========================================
Cisco2511#show run
Building configuration...
Current configuration:
!
version 11.3
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname Cisco2511
!
enable password xxxxxx
!
ip subnet-zero
ip nat inside source list 1 interface Serial1 overload
no ip domain-lookup
!
!
!
interface Ethernet0
description connected to EthernetLAN
ip address 192.168.1.10 255.255.255.0
ip nat inside
!
interface Serial0
no ip address
no ip mroute-cache
shutdown
!
interface Serial1
description connected to Microsys
ip address 192.168.2.1 255.255.255.252
ip nat outside
encapsulation ppp
!
interface Async1
no ip address
shutdown
!
interface Async2
no ip address
shutdown
!
interface Async3
no ip address
shutdown
!
interface Async4
no ip address
shutdown
!
interface Async5
no ip address
shutdown
!
interface Async6
no ip address
shutdown
!
interface Async7
no ip address
shutdown
!
interface Async8
no ip address
shutdown
!
interface Async9
no ip address
shutdown
!
interface Async10
no ip address
shutdown
!
interface Async11
no ip address
shutdown
!
interface Async12
no ip address
shutdown
!
interface Async13
no ip address
shutdown
!
interface Async14
no ip address
shutdown
!
interface Async15
no ip address
shutdown
!
interface Async16
no ip address
shutdown
!
router rip
version 2
passive-interface Serial1
network 192.168.1.0
network 192.168.2.0
no auto-summary
!
ip classless
ip route 0.0.0.0 0.0.0.0 Serial1
!
access-list 1 permit 192.168.1.0 0.0.0.255
snmp-server community public RO
!
line con 0
exec-timeout 0 0
password xxxx
login
password xxxx
login
!
end
08-01-2003 09:19 AM
are you sure your serial interface is not an async , some 25xx routers only come with low speed serials and only will support up to 128K, if you exceed the 128K a symptom would be line protocol down, a sh ver will show you this , please paste in a sh ver
08-01-2003 09:26 AM
Cisco2511#show ver
Cisco Internetwork Operating System Software
IOS (tm) 2500 Software (C2500-I-L), Version 11.3(9)T, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Wed 07-Apr-99 15:27 by pwade
Image text-base: 0x0302BB8C, data-base: 0x00001000
ROM: System Bootstrap, Version 11.0(10c), SOFTWARE
BOOTFLASH: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c), RELEASE SOFTWARE (fc1)
Cisco2511 uptime is 35 minutes
System restarted by power-on
System image file is "flash:c2500-i-l_113-9_T.bin", booted via flash
cisco 2511 (68030) processor (revision L) with 14336K/2048K bytes of memory.
Processor board ID 06197855, with hardware revision 00000000
Bridging software.
X.25 software, Version 3.0.0.
1 Ethernet/IEEE 802.3 interface(s)
2 Serial network interface(s)
16 terminal line(s)
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read ONLY)
Configuration register is 0x2102
=========================================
DSU : JNA FlexRate NTU V.35
08-01-2003 09:48 AM
cool it looks like you are ok with the serial interfaces . What about the other end? what kind of box is there ? If it is a Cisco box when you use hdlc do you get protocol up or down ?
Is there an extended demarc at either end ?
08-01-2003 11:37 AM
i've another sign of problem.
when i choose "ppp encap" and push "local or remote loop test", then protocal is down.
when i choose "hdlc encap" and push "local or remote loop test", then protocal is up.
is my link provider not support "encap ppp" ?
help pls.
08-01-2003 12:07 PM
Ok, good,
have you tried s1 yet ? maybe s0 is bad
when you use hdlc can you ping ?
What does the carrier loop the smartjack or the csu's ?
PPP has more overhead than hdlc and is going to be more sensitive to a dirty line. What you can do is change the encap to hdlc so oyu get line and protocol up . Once you have this you can perform loops to isolate the problem .
If you have external CSU give yourself a dte loop on both ends , this will loop your dsu to your serial interface when the line goes up up (looped) ping yourself , you should get all your ping back , if you do not there is a problem between the dsu and the serial int , mostlikey a bad v.35.
if both sides ping good then from the csu a put up a line loop this will loop csu a toward router b , then ping if pings fail then put loopback plug on the smart jack from router b to csu a on router a you should see up up (looped ) if you do not then a problem with the carrier , if you can ping ok then you have a problem between demarc at routerb side and router B
08-01-2003 12:48 PM
ok , when i change to "hdlc encap", everything is working ( protocal is up , i can ping to another side ). Thanks for your every advise.
I just wonder why "ppp encap" is not work on this case ? Because i have a router ( Zyxel Prestige153x ) which not support "hdlc encap". So if one day i need to use Prestige153x via "ppp encap", it's not work for sure. How do i use "ppp encap" for the future use ?
I mean, right now "hdlc encap" is work fine & "ppp encap" is not work. But I need to use "ppp encap" for the future using. How do I ?
08-01-2003 02:08 PM
On the remote end is there any authentication configured ? I noticed in your sh int s0 earlier that the LCP is in Listen , this mean it is waiting for a response from the remote end. With PPP all the parameters must match on each end of the link.What does the config on the remote side look like when ppp is configured ?
08-06-2003 01:56 AM
Hello, I think you should put a no keepalive command on the serial interface
tell me what happens.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide