10-29-2003 10:29 AM - edited 03-02-2019 11:20 AM
I have 2 directly connected 2501 routers hooked up via back-to-back DCE/DTE cable. I have configuerd my Serial Interfaces with; No shut, ip addresses 20.0.0.1 and 20.0.0.2, clock rate, and bandwidth. I have also enabled "router rip network 20.0.0.0".
"Serial0 is up, line protocol is up" on both router serials, however I cannot ping the interfaces from either router ? Please help.
-Yami
10-30-2003 06:35 AM
By way of troubleshooting, try to check if there is any other protocol running prior to rip protocol and you have not done redistribution.
Again, try to reboot the two routers b/c memory problem could cause such.
10-30-2003 06:48 AM
Make sure your ethernet interfaces are up.
ICMP echo and echo-replies require an ethernet address.
Serial interfaces do not have a hardware address assigned and must use one from an ethernet interface that is up/up.
10-30-2003 06:48 AM
What subnet mask do you use
10-30-2003 07:18 AM
Routing protocols have nothing to do with pinging directly connected . Can you paste in the config of both interfaces as well as a sh int serial x from both
10-30-2003 07:27 AM
Hi Yami,
Do a debug ip packet and do the ping command again. This will give some visibility as to what is happening.
cheers
Victor
Network Engineer
Directfirst Computing Solutions Ltd
10-30-2003 10:22 AM
Thanks to everyones help. I now have the serial interfaces pinging from router to directly connected router. It seems that I could not cable Serial 0 (R1) to Serial 1 (R2). Instead I had to go Serial 0 (R1) to Serial 0 (R2) and Serial 1 (R1) to Serial 1 (R2). At least that gave me "direct" ping, however I still have a big problem. I have added another router into my lab and now I realize that I cannot ping to routers that are not directly connected. ie R1 cannot ping R3. This is the config I currently have on the three routers;
hostname R1
!
enable secret xxxxx.
!
ip subnet-zero
!
!
!
!
interface Ethernet0
bandwidth 64
ip address 10.0.0.1 255.0.0.0
!
interface Serial0
bandwidth 64
ip address x.x.x.1 255.0.0.0
clockrate 64000
dce-terminal-timing-enable
!
interface Serial1
ip address x.x.x.1 255.0.0.0
clockrate 64000
!
router rip
network 10.0.0.0
network 20.0.0.0
network 30.0.0.0
!
ip http server
ip classless
!
!
!
!
line con 0
password xxxx
login
line aux 0
password xxxx
login
line vty 0 4
password xxxx
login
!
!
end
------------------------------------
hostname R2
!
enable secret xxxxxx!
ip subnet-zero
!
!
!
!
interface Ethernet0
bandwidth 64
ip address 10.0.0.2 255.0.0.0
!
interface Serial0
bandwidth 64
ip address x.x.x.2 255.0.0.0
no fair-queue
!
interface Serial1
bandwidth 64
ip address x.x.x.2 255.0.0.0
clockrate 64000
dce-terminal-timing-enable
!
router rip
network 10.0.0.0
network 20.0.0.0
network 30.0.0.0
!
ip http server
ip classless
!
!
!
!
line con 0
password xxxx
login
line aux 0
password xxxx
login
line vty 0 4
password cisco
login
!
!
end
--------------------------------
hostname R3
!
enable secret xxxxx
!
ip subnet-zero
!
!
!
!
interface Ethernet0
bandwidth 64
ip address 10.0.0.3 255.0.0.0
!
interface Serial0
bandwidth 64
ip address x.x.x.3 255.0.0.0
clockrate 64000
dce-terminal-timing-enable
!
interface Serial1
bandwidth 64
ip address x.x.x.3 255.0.0.0
!
router rip
network 10.0.0.0
network 20.0.0.0
network 30.0.0.0
!
no ip http server
ip classless
!
!
!
!
line con 0
line aux 0
line vty 0 4
password xxxx
login
!
!
end
10-30-2003 10:42 AM
your serial 0 and 1 on one of the routers has to be up down . from what I have figured out you should be able to ping the 10 network from any router. Can you verify your topology
10-30-2003 11:08 AM
Yes your correct, one Serial1 and Serial0 is connected to nothing. Right now Im just dealing with the serial connections so network 10.0.0.0 is out of the picture. Im dealing with
20.0.0.1 and 30.0.0.1 (R1)
-------I---------------------
20.0.0.2 and 30.0.0.2 (R2)
------------------------I----
20.0.0.3 and 30.0.0.3 (R3)
So
I can ping/telnet from 20.0.0.1 to 20.0.0.2
I can ping/telnet from 30.0.0.2 to 30.0.0.3
I can not ping/telnet from 20.0.0.1 to 30.0.0.2
I can not ping/telnet from 30.0.0.2 to 20.0.0.3
10-30-2003 11:41 AM
I beleive that the interface 20.0.0.3 should be up/down or it is connected to an interface 30.0.0.1 that is on a different subnet , and this is the reason you can not ping .
you should be able to ping from 20.0.0.1 to 30.0.0.2 , can you paste in a sh ip route from both routers
10-30-2003 04:23 PM
This is what I have for the "Sh ip ro";
R1
---
Gateway of last resort is not set
C 20.0.0.0/8 is directly connected, Serial0
R 10.0.0.0/8 [120/3] via 20.0.0.2, 00:00:05, Serial0
R 30.0.0.0/8 [120/1] via 20.0.0.2, 00:00:05, Serial0
R2
----
Gateway of last resort is not set
C 20.0.0.0/8 is directly connected, Serial0
R 10.0.0.0/8 [120/2] via 30.0.0.3, 00:00:19, Serial1
C 30.0.0.0/8 is directly connected, Serial1
R3
----
Gateway of last resort is not set
C 20.0.0.0/8 is directly connected, Serial0
R 10.0.0.0/8 [120/1] via 20.0.0.4, 00:00:07, Serial0
C 30.0.0.0/8 is directly connected, Serial1
RIP dose work on Ethernet "and" Serial links right ?
10-31-2003 05:22 AM
Try this , on all interfaces that are not in use are are not up up admin them down. i.e the ethernet segment and , I beleive the s0 of the router 3 should be up down , it does not appear to be connected to anything, and if it is the only available interface is s1 of router 1 and that is on a different network .
10-31-2003 06:19 AM
RIP does work on Ethernet and Serial links.
Could you please paste the results of a "show cdp neighbor"
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