serial int down

[jim3725]

I am trying to build lab.
I have 2 cisco 2500 routers with an older 1900 switch
I am unable to have the Serial0 protocol come up on both of my routers
The routers are connected by a db60 serial cable(female)
The aui interface(ethernet) are connected to the 1900 switch
with the switch having ip address of 192.168.3.5
What am I missing on getting the Serial interfaces ip protocol to be up? I have allready tried no shutdown command

Router 2
Interface IP-Address OK? Method Status Protocol
Ethernet0 192.168.3.1 YES manual up up
Serial0 192.168.4.1 YES manual down down

Router1
Ethernet0 192.168.6.1 YES manual up up
Serial0 192.168.4.2 YES manual down down

 

[hexn]

if your routers are back to back over serial, then one side must be DCE and the other DTE and the DCE needs interface needs to have a clockrate configured on it.

 

[jim3725]

thanks inikis, I thought that was the case, I need to do some research on learning on to do this,

 

[jim3725]

After doing clockrate on dce router, I still can't get serial int up. Here is my config on dce router
I have the eth0 int up on both routers but not the Serial Int. Please assist!!
lab1>
version 11.1
service udp-small-servers
service tcp-small-servers
!
hostname lab1
!
interface Ethernet0
ip address 192.168.6.1 255.255.255.0
!
interface Serial0
ip address 192.168.4.2 255.255.255.0
clockrate 56000
!
interface Serial1
no ip address
shutdown
!
router rip
network 192.168.6.0
network 192.168.4.0
!
no ip classless
!
line con 0
line aux 0
line vty 0 4
login
!
end


lab1>sho ip int brief
Interface IP-Address OK? Method Status Protocol

Ethernet0 192.168.6.1 YES manual up down

Serial0 192.168.4.2 YES manual down down

Serial1 unassigned YES unset administratively down down

lab1>

































lab1 con0 is now available





Press RETURN to get started.











lab1>
lab1>
lab1>
lab1>en
lab1#config t
Enter configuration commands, one per line. End with CNTL/Z.
lab1(config)#sho ip int brief
^
% Invalid input detected at '^' marker.

lab1(config)#exit
lab1#
%SYS-5-CONFIG_I: Configured from console by consolesho ip int brief
Interface IP-Address OK? Method Status Protocol

Ethernet0 192.168.6.1 YES manual up down

Serial0 192.168.4.2 YES manual down down

Serial1 unassigned YES unset administratively down down

lab1#config t
Enter configuration commands, one per line. End with CNTL/Z.
lab1(config)#int s0
lab1(config-if)#clock-rate 56000
^
% Invalid input detected at '^' marker.

lab1(config-if)#clock
lab1(config-if)#clock?
clock

lab1(config-if)#clock rate
lab1(config-if)#clock rate ?
0 Speed (bits per second)
300
1200
2400
4800
9600
14400
19200
28800
32000
38400
56000
57600
64000
72000
115200
125000
148000
250000
500000
800000
1000000
1300000
2000000
4000000
8000000

lab1(config-if)#clock rate 56000
lab1(config-if)#^Z
lab1#
%SYS-5-CONFIG_I: Configured from console by console
lab1#sho ip protocol
Routing Protocol is "rip"
Sending updates every 30 seconds, next due in 0 seconds
Invalid after 180 seconds, hold down 180, flushed after 240
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Redistributing: rip
Default version control: send version 1, receive any version
Routing for Networks:
192.168.6.0
192.168.4.0
Routing Information Sources:
Gateway Distance Last Update
Distance: (default is 120)

lab1#sho ip int brief
Interface IP-Address OK? Method Status Protocol

Ethernet0 192.168.6.1 YES manual up down

Serial0 192.168.4.2 YES manual down down

Serial1 unassigned YES unset administratively down down

lab1#sho 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
U - per-user static route

Gateway of last resort is not set

lab1#sho ip rip
^
% Invalid input detected at '^' marker.

lab1#sho ip int brief
Interface IP-Address OK? Method Status Protocol

Ethernet0 192.168.6.1 YES manual up down

Serial0 192.168.4.2 YES manual down down

Serial1 unassigned YES unset administratively down down

lab1#sho runn
Building configuration...

Current configuration:
!
version 11.1
service udp-small-servers
service tcp-small-servers
!
hostname lab1
!
!
!
interface Ethernet0
ip address 192.168.6.1 255.255.255.0
!
interface Serial0
ip address 192.168.4.2 255.255.255.0
clockrate 56000
!
interface Serial1
no ip address
shutdown
!
router rip
network 192.168.6.0
network 192.168.4.0
!
no ip classless
!
line con 0
line aux 0
line vty 0 4
login
!
end

lab1#config t
Enter configuration commands, one per line. End with CNTL/Z.
lab1(config)#int s0
lab1(config-if)#no shutdown
lab1(config-if)#^Z
lab1#s
%SYS-5-CONFIG_I: Configured from console by consoleho ip int brief
Interface IP-Address OK? Method Status Protocol

Ethernet0 192.168.6.1 YES manual up down

Serial0 192.168.4.2 YES manual down down

Serial1 unassigned YES unset administratively down down

lab1#copy ru
lab1#copy running-config star
lab1#copy running-config startup-config
Building configuration...
[OK]
lab1#sho ip int brief
Interface IP-Address OK? Method Status Protocol

Ethernet0 192.168.6.1 YES manual up down

Serial0 192.168.4.2 YES manual down down

Serial1 unassigned YES unset administratively down down

lab1#ping 192.168.4.2

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echoes to 192.168.4.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
lab1#


lab1>sho ip int brief
Interface IP-Address OK? Method Status Protocol

Ethernet0 192.168.6.1 YES manual up up

Serial0 192.168.4.2 YES manual down down

version 11.1
service udp-small-servers
service tcp-small-servers
!
hostname lab1
!
!
!
interface Ethernet0
ip address 192.168.6.1 255.255.255.0
!
interface Serial0
ip address 192.168.4.2 255.255.255.0
clockrate 56000
!
interface Serial1
no ip address
shutdown
!
router rip
network 192.168.6.0
network 192.168.4.0
!
no ip classless
!
line con 0
line aux 0
line vty 0 4
login
!
end

lab1#

 

[krs2pher]

Try setting a bandwidth of 56 on each of the routers serial interfaces. The default of t1 might be conflicting with your clockrate statement. Also, as simple as this sounds, check and make sure your DTE/DCE cable isn't plugged in upside down, it will fit that way, and will cause you grief when troublshooting.