serial interface will not open 2

[OV105]

Hi,

I was practicing static routing and ran into a problem with the serial interfaces on router 2. I erased the startup-config and executed a reload. I configured serial0 interface and verified the ip address and ip route were correct. I issued the no shutdown command and ctrl Z to get back to the enable prompt. Using the show ip interface command I noticed serial0 was listed as "manual down."

Router 2 and 3 are the same model and IOS version. In the bootup process for router 2 I saw a message saying, NVRAM invalid, possibly due to write erase. Using IOS help, I ran some show commands to see if I could find anything out of the ordinary with the interfaces on this router. I did a show queue command on serial0 and nothing came up. On serial1 the router returned with Ethernet, Null and Serial information.

I noticed serial1 showed administratively down. So I removed the ip address and ip route from serial0 and configured it on serial1. Using a, show ip interface command, I noticed serial1 went into "manual" down.

Does any one have any advice on what the problem may be, or any other steps that may shed light on why the serial interfaces on this router will not open?

Thanks in advance...

 

[Cluebird]

You need to add the "no shutdown" command to the interface after you add the IP. Administratively down means you forgot to activate the interface with no shut.

HTH

 

[OV105]

I entered a no shutdown after the ip address and it made no difference. Even the static route I entered does not show up. If it helps, I swapped around router's 2 and 3, erased their startup configs, executed a relaod and programmed them. Router 3 is performing perfectly in router 2's old position, but router 2 is still showing the same problem.

My next step was to disconnect router 2 from the network, connect to the console port and ping the ip address. The reply is, host unreachable. When I did this same thing on the other two routers I get a positive reply.

 

[ISPKing]

Sho ver
Sho diag.

CCNP

 

[OV105]

show verision:

Ethernet0 is administratively down, line protocol is down
Internet protocol processing disabled
Ethernet1 is administratively down, line protocol is down
Internet protocol processing disabled
Serial0 is down, line protocol is down
Internet address is 192.168.1.2/24
Broadcast address is 255.255.255.255
Address determined by setup command
MTU is 1500 bytes
Helper address is not set
Directed broadcast forwarding is enabled
Outgoing access list is not set
Inbound access list is not set
Proxy ARP is enabled
Security level is default
Split horizon is enabled
ICMP redirects are always sent
ICMP unreachables are always sent
ICMP mask replies are never sent
IP fast switching is enabled
IP fast switching on the same interface is enabled
IP multicast fast switching is enabled
Router Discovery is disabled
IP output packet accounting is disabled
IP access violation accounting is disabled
TCP/IP header compression is disabled
Probe proxy name replies are disabled
Gateway Discovery is disabled
Policy routing is disabled
Network address translation is disabled
Serial1 is administratively down, line protocol is down
Internet protocol processing disabled

Show dia:
Returns a blank line.

 

[OV105]

ZR2#show version
Cisco Internetwork Operating System Software
IOS (tm) 2500 Software (C2500-I-L), Version 11.2(10a), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1997 by cisco Systems, Inc.
Compiled Tue 02-Dec-97 16:02 by ckralik
Image text-base: 0x03022B40, 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)

ZR2 uptime is 1 hour, 48 minutes
System restarted by reload
System image file is "flash:c2500-i-l.112-10a", booted via flash

cisco 2500 (68030) processor (revision L) with 14336K/2048K bytes of memory.
Processor board ID 09235448, with hardware revision 00000000
Bridging software.
X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.
2 Ethernet/IEEE 802.3 interface(s)
2 Serial network interface(s)
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash partition 1 (Read ONLY)
8192K bytes of processor board System flash partition 2 (Read/Write)

Configuration register is 0x2102

Show dia:
Returns to the global prompt. No data displayed.

 

[Dinkytoy]

From memory is not the 'clock rate xxx' command required on serial interfaces?

 

[OV105]

Yes. I configured a clock rate of 64000 on router 1, s0 and s1. Using a DTE/DCE cable I connected router 1 s0 to router 2 s0. Router 1, s1 was connected to router 3 s0. Router 1 provided the clock rate to routers 2 and 3. By the way, the cables are DCE from router 1 to DTE routers 2 and 3.

 

[Cluebird]

what does the output for show controllers serial0 show?

 

[ISPKing]

Wow, i did not realize how old these things are. You really need to updrage the ios for these to be usefull.

type ip routing from global.
and make sure encapsulation is hdlc on both ends to rule out encap mismatch.

CCNP

 

[Cluebird]

Just a thought since these are such old boxes...Was a modem attached to the problematic serial interface at one time? If so, it may be in async mode rather than synchronous mode.

 

[OV105]

After I return home from work tonight I will copy and post the data from "show controllers."

Due to my work schedule it was necessary for me to purchase a lab kit, which is comprised of three routers and three switches. Prior to the purchase, I was assured by the company that the equipment and operating system would be able to handle CCNA practice labs. I have noticed that the routers do have a problem with certain syntax and commands and that may be due to the age of the IOS. For example, if I enter "class-map" the command will be rejected by the router. In IOS help there is "map-class," but the options shown are different from that of the class-map.

I cannot say for sure if a modem was attached at one time and will check to see if the interface is in sync or async mode. Do you think moving from a static to a dynamic practice lab would make a difference?

I am also wondering that since routers 2 and 3 are the identical model and IOS, would it be beneficial to copy the IOS from router 3 into a tftp server and then load it into router 2?

I am most grateful for everyone who has considered this issue and taken time to respond.

 

[Cluebird]

Changing the image won't help anything if both routers have the same image already. If you can get an image for the routers that is 12.2 or 12.3 you'll get most of the commands you're looking for.

There is the further possibility you have bad hardware on the one router but don't have enough information yet to make that call.

The company that said the 11.2 IOS could do CCNA work was stating something that may have been true 9 years ago, but not anymore. With the most recent 12.3 IOS the 2500 is capable of running, that platform may be good for 70% of CCNA work IMHO.

 

[OV105]

Looking at an email I received from the company prior to my purchasing the lab kit, I quote the seller as saying,

"The version of IOS with the units is pretty current and is fine for the exam. We have been doing this for years and are knowledgable in what you need for the exam. That is why we put together preconfigured kits."

 

[burtsbees]

Please post a topology and sh run from all routers in question along with the problem(s), like

A>router 1 can ping router 2
b)router 2 can ping router 3
c)router 3 cannot ping router 1
d)What is the air speed velocity of an unlaiden swallow?
e)lol
f)No I am not drunk

/

tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!

 

[ISPKing]

You ios is from 1997. The exam is 2010. Lots of commands syntax has changed.

CCNP

 

[OV105]

Topology:

ZR1 – S0 (DCE) ip 192.168.1.1 255.255.255.0
To
ZR2 – S0 (DTE) ip 192.168.1.2 255.255.255.0
ip route 193.1.1.0 255.255.255.0 192.168.1.1

ZR1 – S1 (DCE) ip 193.1.1.1 255.255.255.0
To
ZR3 – S0 (DTE) ip 193.1.1.3 255.255.255.0
ip route 192.168.1.0 255.255.255.0 193.1.1.1

ZR2 - Result of [show controllers]

ZR2>show controllers:

LANCE unit 0, idb 0x8D4A0, ds 0x8EF60, regaddr = 0x2130000, reset_mask 0x2
IB at 0xE06DAC: mode=0x0000, mcfilter 0000/0000/0100/0000
station address 0010.7b38.1730 default station address 0010.7b38.1730
buffer size 1524
RX ring with 16 entries at 0xE06DF0
Rxhead = 0xE06DF0 (0), Rxp = 0x8EF7C (0)
00 pak=0x091BE0 ds=0xE10A2E status=0x80 max_size=1524 pak_size=0
01 pak=0x091A10 ds=0xE10376 status=0x80 max_size=1524 pak_size=0
02 pak=0x091840 ds=0xE0FCBE status=0x80 max_size=1524 pak_size=0
03 pak=0x091670 ds=0xE0F606 status=0x80 max_size=1524 pak_size=0
04 pak=0x0914A0 ds=0xE0EF4E status=0x80 max_size=1524 pak_size=0
05 pak=0x0912D0 ds=0xE0E896 status=0x80 max_size=1524 pak_size=0
06 pak=0x091100 ds=0xE0E1DE status=0x80 max_size=1524 pak_size=0
07 pak=0x090F30 ds=0xE0DB26 status=0x80 max_size=1524 pak_size=0
08 pak=0x090D60 ds=0xE0D46E status=0x80 max_size=1524 pak_size=0
09 pak=0x090B90 ds=0xE0CDB6 status=0x80 max_size=1524 pak_size=0
10 pak=0x0909C0 ds=0xE0C6FE status=0x80 max_size=1524 pak_size=0
11 pak=0x0907F0 ds=0xE0C046 status=0x80 max_size=1524 pak_size=0
12 pak=0x090620 ds=0xE0B98E status=0x80 max_size=1524 pak_size=0
13 pak=0x090450 ds=0xE0B2D6 status=0x80 max_size=1524 pak_size=0
14 pak=0x090280 ds=0xE0AC1E status=0x80 max_size=1524 pak_size=0
15 pak=0x0900B0 ds=0xE0A566 status=0x80 max_size=1524 pak_size=0
TX ring with 4 entries at 0xE06EA8, tx_count = 0
tx_head = 0xE06EA8 (0), head_txp = 0x8EFD0 (0)
tx_tail = 0xE06EA8 (0), tail_txp = 0x8EFD0 (0)
00 pak=0x000000 ds=0x000000 status=0x03 status2=0x0000 pak_size=0
01 pak=0x000000 ds=0x000000 status=0x03 status2=0x0000 pak_size=0
02 pak=0x000000 ds=0x000000 status=0x03 status2=0x0000 pak_size=0
03 pak=0x000000 ds=0x000000 status=0x03 status2=0x0000 pak_size=0
0 missed datagrams, 0 overruns
0 transmitter underruns, 0 excessive collisions
0 single collisions, 0 multiple collisions
0 dma memory errors, 0 CRC errors

0 alignment errors, 0 runts, 0 giants
0 tdr, 0 spurious initialization done interrupts
0 no enp status, 0 buffer errors, 0 overflow errors
0 tx_buff, 0 throttled, 0 enabled
Lance csr0 = 0x4
LANCE unit 1, idb 0x92C78, ds 0x94738, regaddr = 0x2130040, reset_mask 0x10
IB at 0xE1465C: mode=0x0000, mcfilter 0000/0000/0100/0000
station address 0010.7b38.1731 default station address 0010.7b38.1731
buffer size 1524
RX ring with 16 entries at 0xE146A0
Rxhead = 0xE146A0 (0), Rxp = 0x94754 (0)
00 pak=0x0973B8 ds=0xE1E2DE status=0x80 max_size=1524 pak_size=0
01 pak=0x0971E8 ds=0xE1DC26 status=0x80 max_size=1524 pak_size=0
02 pak=0x097018 ds=0xE1D56E status=0x80 max_size=1524 pak_size=0
03 pak=0x096E48 ds=0xE1CEB6 status=0x80 max_size=1524 pak_size=0
04 pak=0x096C78 ds=0xE1C7FE status=0x80 max_size=1524 pak_size=0
05 pak=0x096AA8 ds=0xE1C146 status=0x80 max_size=1524 pak_size=0
06 pak=0x0968D8 ds=0xE1BA8E status=0x80 max_size=1524 pak_size=0
07 pak=0x096708 ds=0xE1B3D6 status=0x80 max_size=1524 pak_size=0
08 pak=0x096538 ds=0xE1AD1E status=0x80 max_size=1524 pak_size=0
09 pak=0x096368 ds=0xE1A666 status=0x80 max_size=1524 pak_size=0
10 pak=0x096198 ds=0xE19FAE status=0x80 max_size=1524 pak_size=0
11 pak=0x095FC8 ds=0xE198F6 status=0x80 max_size=1524 pak_size=0
12 pak=0x095DF8 ds=0xE1923E status=0x80 max_size=1524 pak_size=0
13 pak=0x095C28 ds=0xE18B86 status=0x80 max_size=1524 pak_size=0
14 pak=0x095A58 ds=0xE184CE status=0x80 max_size=1524 pak_size=0
15 pak=0x095888 ds=0xE17E16 status=0x80 max_size=1524 pak_size=0
TX ring with 4 entries at 0xE14758, tx_count = 0
tx_head = 0xE14758 (0), head_txp = 0x947A8 (0)
tx_tail = 0xE14758 (0), tail_txp = 0x947A8 (0)
00 pak=0x000000 ds=0x000000 status=0x03 status2=0x0000 pak_size=0
01 pak=0x000000 ds=0x000000 status=0x03 status2=0x0000 pak_size=0
02 pak=0x000000 ds=0x000000 status=0x03 status2=0x0000 pak_size=0
03 pak=0x000000 ds=0x000000 status=0x03 status2=0x0000 pak_size=0
0 missed datagrams, 0 overruns
0 transmitter underruns, 0 excessive collisions
0 single collisions, 0 multiple collisions
0 dma memory errors, 0 CRC errors

0 alignment errors, 0 runts, 0 giants
0 tdr, 0 spurious initialization done interrupts
0 no enp status, 0 buffer errors, 0 overflow errors
0 tx_buff, 0 throttled, 0 enabled
Lance csr0 = 0x4
HD unit 0, idb = 0x99774, driver structure at 0x9D440
buffer size 1524 HD unit 0, V.35 DTE cable
cpb = 0xE2, eda = 0x2140, cda = 0x2000
RX ring with 16 entries at 0xE22000
00 bd_ptr=0x2000 pak=0x0A0018 ds=0xE2C468 status=80 pak_size=0
01 bd_ptr=0x2014 pak=0x09FE48 ds=0xE2BDB0 status=80 pak_size=0
02 bd_ptr=0x2028 pak=0x09FC78 ds=0xE2B6F8 status=80 pak_size=0
03 bd_ptr=0x203C pak=0x09FAA8 ds=0xE2B040 status=80 pak_size=0
04 bd_ptr=0x2050 pak=0x09F8D8 ds=0xE2A988 status=80 pak_size=0
05 bd_ptr=0x2064 pak=0x09F708 ds=0xE2A2D0 status=80 pak_size=0
06 bd_ptr=0x2078 pak=0x09F538 ds=0xE29C18 status=80 pak_size=0
07 bd_ptr=0x208C pak=0x09F368 ds=0xE29560 status=80 pak_size=0
08 bd_ptr=0x20A0 pak=0x09F198 ds=0xE28EA8 status=80 pak_size=0
09 bd_ptr=0x20B4 pak=0x09EFC8 ds=0xE287F0 status=80 pak_size=0
10 bd_ptr=0x20C8 pak=0x09EDF8 ds=0xE28138 status=80 pak_size=0
11 bd_ptr=0x20DC pak=0x09EC28 ds=0xE27A80 status=80 pak_size=0
12 bd_ptr=0x20F0 pak=0x09EA58 ds=0xE273C8 status=80 pak_size=0
13 bd_ptr=0x2104 pak=0x09E888 ds=0xE26D10 status=80 pak_size=0
14 bd_ptr=0x2118 pak=0x09E6B8 ds=0xE26658 status=80 pak_size=0
15 bd_ptr=0x212C pak=0x09E4E8 ds=0xE25FA0 status=80 pak_size=0
16 bd_ptr=0x2140 pak=0x09E318 ds=0xE258E8 status=80 pak_size=0
cpb = 0xE2, eda = 0x2800, cda = 0x2800
TX ring with 2 entries at 0xE22800
00 bd_ptr=0x2800 pak=0x000000 ds=0x000000 status=80 pak_size=0
01 bd_ptr=0x2814 pak=0x000000 ds=0x000000 status=80 pak_size=0
02 bd_ptr=0x2828 pak=0x000000 ds=0x000000 status=80 pak_size=0
0 missed datagrams, 0 overruns
0 bad datagram encapsulations, 0 memory errors
0 transmitter underruns
0 residual bit errors
HD unit 1, idb = 0xA10B0, driver structure at 0xA4D80
buffer size 1524 HD unit 1, No cable
cpb = 0xE3, eda = 0x940, cda = 0x800
RX ring with 16 entries at 0xE30800
00 bd_ptr=0x0800 pak=0x0A7954 ds=0xE3A5B0 status=00 pak_size=0
01 bd_ptr=0x0814 pak=0x0A7784 ds=0xE39EF8 status=00 pak_size=0
02 bd_ptr=0x0828 pak=0x0A75B4 ds=0xE39840 status=00 pak_size=0
03 bd_ptr=0x083C pak=0x0A73E4 ds=0xE39188 status=00 pak_size=0
04 bd_ptr=0x0850 pak=0x0A7214 ds=0xE38AD0 status=00 pak_size=0
05 bd_ptr=0x0864 pak=0x0A7044 ds=0xE38418 status=00 pak_size=0
06 bd_ptr=0x0878 pak=0x0A6E74 ds=0xE37D60 status=00 pak_size=0
07 bd_ptr=0x088C pak=0x0A6CA4 ds=0xE376A8 status=00 pak_size=0
08 bd_ptr=0x08A0 pak=0x0A6AD4 ds=0xE36FF0 status=00 pak_size=0
09 bd_ptr=0x08B4 pak=0x0A6904 ds=0xE36938 status=00 pak_size=0
10 bd_ptr=0x08C8 pak=0x0A6734 ds=0xE36280 status=00 pak_size=0
11 bd_ptr=0x08DC pak=0x0A6564 ds=0xE35BC8 status=00 pak_size=0
12 bd_ptr=0x08F0 pak=0x0A6394 ds=0xE35510 status=00 pak_size=0
13 bd_ptr=0x0904 pak=0x0A61C4 ds=0xE34E58 status=00 pak_size=0
14 bd_ptr=0x0918 pak=0x0A5FF4 ds=0xE347A0 status=00 pak_size=0
15 bd_ptr=0x092C pak=0x0A5E24 ds=0xE340E8 status=00 pak_size=0
16 bd_ptr=0x0940 pak=0x0A5C54 ds=0xE33A30 status=00 pak_size=0
cpb = 0xE3, eda = 0x1000, cda = 0x1000
TX ring with 2 entries at 0xE31000
00 bd_ptr=0x1000 pak=0x000000 ds=0x000000 status=80 pak_size=0
01 bd_ptr=0x1014 pak=0x000000 ds=0x000000 status=80 pak_size=0
02 bd_ptr=0x1028 pak=0x000000 ds=0x000000 status=80 pak_size=0
0 missed datagrams, 0 overruns
0 bad datagram encapsulations, 0 memory errors
0 transmitter underruns
0 residual bit errors

Results of Ping:

ZR1 cannot ping ZR2
ZR1 can ping ZR3 Serial0

ZR2 cannot ping any one

ZR3 cannot ping ZR2
ZR3 can ping ZR1 Serial0, but not Serial1

Regarding Swallow questionn: If I were a king I'd know the answer.

 

[ISPKing]

Just junk em, there problems are becoming counter productive.

CCNP

 

[OV105]

Would it make a difference if the IOS was upgraded?

 

[ISPKing]

well, a newer ios would make them less obsolete. But again there functionality is limited. if you are studying for the CCNA you will need at least one 2621xm for sdm, and router on a stick. These 2500 would be good for just practising dynamic routing. Assuming the interfaces come up.

CCNP