07-20-2009 03:53 AM - edited 03-04-2019 05:29 AM
I need to configure Cisco 2811 serial wic 1T but it doesn't work : Serial0/0/0 is up, line protocol is down
See the architecture in attachments
I don't know with type of equipment is used on remote side
See below the configuration of serial on remote site(the ISP have send it)
Serial4/7 is up, line protocol is up
Hardware is M8T-V.35
Description: CUS: ABCD
Internet address is 162.192.48.119/30
MTU 1500 bytes, BW 3584 Kbit, DLY 20000 usec,
reliability 247/255, txload 12/255, rxload 7/255
Encapsulation HDLC, crc 16, loopback not set
Keepalive set (10 sec)
Restart-Delay is 0 secs
See also the output command on my Cisco 2811 router in attachment
When I change the Cisco 2811 and use different router(not Cisco), it work
Please how can I solve this problem ?
07-20-2009 05:02 AM
Hi,
You can tried to put the following command to see if that fix the problem.
encapsulation ppp
Also, I see your have the following command
no ip route-cache cef
no ip route-cache
this will make the switch to use switch process the packets, and it can cause high CPU. You should consider to do
ip route-cache cef
ip route-cache
HTH,
jerry
07-20-2009 05:27 AM
cam
While I agree with Jerry that it is much better to use ip route-cache cef and ip route-cache, I do not believe that this is the fundamental problem.
In my experience there are several things that can cause line up line protocol down on serial interfaces. One of them is protocol mismatch (perhaps HFLC on one end and PPP on the other end). But if what is included in your post is accurate then both ends are using HDLC. Another thing that can cause this symptom is if one end is configured to use keepalives but the other end is configured with no keepalive. But it looks like both you and the provider are using keepalive.
Another thing that can cause the symptom is a problem with clocking. We can not tell from what is posted if it might be a problem with clocking. Perhaps if you would post the output of show controller we might have some useful information about this.
I also wonder if the problem might be a problem in connectivity. Can you verify that you are correctly connected?
As I look more closely at what you posted I notice that the output of show interface shows that Carrier Detect is down. I believe that this may also point to some connectivity problem.
While it is not part of the fundamental problem I would point out that there are problems in the addressing configured on your router. The interface configured on your serial interface does not match the address configured by the provider (check the first octet). Also the addresses on the Ethernet interfaces seems to be in the same subnet, which is not valid.
HTH
Rick
07-20-2009 05:30 AM
Thanks for your reply
Encapsulation PPP doesn't work
I forget one precision
When I configure encapsulation to HDLC, line protocol is up few second and then go back to line protocol down
When I use encapsulation PPP it doesn't work
Please I need help I am very disappointed
07-20-2009 05:34 AM
Hi cam,
I will agree with Rick to check your clocking, you can post the output of the show controller output.
Regards,
jerry
07-20-2009 06:02 AM
As I told you before,
I forget one precision
When I configure encapsulation to HDLC, line protocol is up few second and then go back to line protocol down
When I use encapsulation PPP it doesn't work
During the troubleshooting, I copied the show controller output(just the serial part)
You can see it in attachment
Now I am not near the equipment , but if you absolutely need the whole show controller output, I can go back and copy it
Thanks in advance for your help
07-20-2009 06:25 AM
HDLC is tring to come up. Since it cannot come up at all, line protocol will be up for a few second and goes back down. This is normal behavior.
Your show controller output is fine.
HTH,
jerry
07-20-2009 08:12 AM
According to your picture you have a Comtech CDM-600 modem in front of the Cisco router. This modem has a fairly extensive set of software-configured options for the serial connection. It looks like the configuration on the modem is what should be matched up with the configuration on the Cisco router's serial interface.
Assuming your satellite provider supports the modem (as well as the non-Cisco router?), I'd see if the provider can assist you in resolving this.
http://www.satcomnow.com/satcom/pdf/mn-cdm600_r7.pdf
Here is other documentation on the Comtech website.
http://www.satcomresources.com/Comtech-CDM-600-PSK-Digital-Satellite-Modem
07-20-2009 08:21 AM
make sure the PPP is configured on both side. what is your LCP indicate is it open , close, what stages that goes trough. you also need to chk the framing (ESF/B8ZS)
Hope this helps
07-20-2009 08:33 AM
Hi,
Please check your Serial0/0/0 IP address config:
On the SP side:
Internet address is 162.192.48.119/30
IP address for your S0/0/0:
160.192.50.120 255.255.255.252
They are not in the same subnet.
verify and correct, then test if it works.
Fuming
07-20-2009 08:38 AM
One more thing:
If your S0/0/0 address is:
160.192.50.120/30
Your default-route has problem:
ip route 0.0.0.0 0.0.0.0 160.192.48.119
You cann't reach gateway 160.192.48.119 because they are in different subnet.
07-20-2009 10:33 AM
I change the IP addrese but the problem is the same
interface FastEthernet0/0
description Connect To a
ip address 162.210.33.129 255.255.255.192
duplex auto
speed auto
!
interface FastEthernet0/1
description Connect To b
ip address 162.210.33.252 255.255.255.192
duplex auto
speed auto
!
interface Serial0/0/0
description To Internet
ip address 160.192.50.130 255.255.255.252
no ip route-cache cef
no ip route-cache
!
ip classless
ip route 0.0.0.0 0.0.0.0 160.192.50.129
07-20-2009 10:37 AM
the serial wic 1T is connected opposite Comtech CRS 340 card
I made some research on this card.
See below the caracteristic of this card Comtech CRS 340 card
CRS-340 - EIA-422/-232, LVDS, G.703 Mixed Interface
(1) 25-pin 'D' type female connector
EIA-422/-530 DCE, V.35, SYNC EIA-232, LVDS
(1) 15-pin 'D' type female connector
G.703 Balanced (DDI, DDO, IDI, IDO)
(2) BNC type female connectors
G.703 Unbalanced, (DDI, IDO)
I use the (1) 25-pin 'D' on Comtech CRS 340 card
Do you think that the WIC 1T card should work opposite the Comtech CRS 340 card
07-20-2009 11:02 AM
Hi,
But your SP side address is:
Serial4/7 is up, line protocol is up
Hardware is M8T-V.35
Description: CUS: ABCD
Internet address is 162.192.48.119/30
If your SP side address is:
160.192.50.129/30
Then I guess it will work.
Fuming
07-20-2009 11:46 AM
Hi,
Your IP address and subnet has problems.
Serial4/7 is up, line protocol is up
Hardware is M8T-V.35
Description: CUS: ABCD
Internet address is 162.192.48.119/30
162.192.48.119/30 is broadcast address of subnet 162.192.48.116/30.
162.192.48.116/30 has two usable addresses:
162.192.48.117 and 118.
162.192.48.119/30 cannot be used as interface address.
Fuming
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