10-08-2003 07:40 AM - edited 03-02-2019 10:52 AM
Hi am a newbie to Cisco.
I have a Cisco 2621xm with two ethernet port and 1 T1 WIC. I have Ip set on Ethernet0 10.5.x.x 255.255.255.0 and on T1 to 10.1.X.X 255.255.255.0.
Does anyone know why I can't ping to the T1 ip from the router itself.
Any help would be greatly appreciated.
10-08-2003 07:51 AM
in order to ping the interfaces they must be up up can you paste in a sh int e0 and sh int serial x
10-08-2003 07:56 AM
Hi deilert, thanks for the response. Here's it is.
VIRCIS20.2#show interface fastethernet0/0
FastEthernet0/0 is up, line protocol is up
Hardware is AmdFE, address is 000c.31eb.e5c0 (bia 000c.31eb.e5c0)
Internet address is 10.5.20.2/16
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Half-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 14:51:32
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue :0/40 (size/max)
5 minute input rate 3000 bits/sec, 5 packets/sec
5 minute output rate 1000 bits/sec, 3 packets/sec
100130 packets input, 11498890 bytes
Received 88510 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
14620 packets output, 1574266 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
66 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
VIRCIS20.2#
VIRCIS20.2#show interface serial0/0
Serial0/0 is up, line protocol is up
Hardware is PQUICC with Fractional T1 CSU/DSU
Internet address is 10.1.11.1/24
MTU 1524 bytes, BW 1536 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
Keepalive not set
Last input 00:00:02, output 00:00:56, output hang never
Last clearing of "show interface" counters 14:52:34
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue :0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
12136 packets input, 497484 bytes, 0 no buffer
Received 12136 broadcasts, 0 runts, 2 giants, 0 throttles
940 input errors, 234 CRC, 481 frame, 0 overrun, 0 ignored, 223 abort
1118 packets output, 320577 bytes, 0 underruns
0 output errors, 0 collisions, 5 interface resets
0 output buffer failures, 0 output buffers swapped out
4 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
10-08-2003 10:32 AM
you have no keep configured on serial 0/0 ,with this configured line protocol will never drop , This maike line protocol look up but it really is not . what does the config for the interface on the other side of this line look like ? does it have keepalives configured ? if not you should configure keepalives on both sides 'keep 10' then see if line protocol comes up .
10-08-2003 10:32 AM
can you also paste in a sh run
10-08-2003 10:53 AM
Hi Deilert,
I turned on Keepalive and sure enough the line protocol went down. At the remote end I have a Larscom CSU\DSU, am not sure what the config for keepalive is set for, I have to go over and get the config. In the meantime here's the running config for the Cisco2621. Thanks again.
VIRCIS20.2#show running-config
Building configuration...
Current configuration : 885 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname VIRCIS20.2
!
boot system flash c2600-i-mz.122-8.T10.bin
enable secret xxxxxxxxxx
enable password XXXXX
!
ip subnet-zero
!
!
!
!
!
!
interface FastEthernet0/0
ip address 10.5.20.2 255.255.0.0
ip ospf authentication
no ip mroute-cache
speed auto
half-duplex
!
interface Serial0/0
mtu 1524
ip address 10.1.11.1 255.255.255.0
no ip mroute-cache
delay 10
no keepalive
autodetect encapsulation ppp
roles
role default
no fair-queue
service-module t1 clock source internal
!
interface FastEthernet0/1
no ip address
no ip mroute-cache
shutdown
duplex auto
speed auto
!
ip classless
ip route profile
ip http server
ip ospf name-lookup
ip pim bidir-enable
!
!
!
line con 0
line aux 0
line vty 0 4
password XXXXXXX
!
!
end
10-08-2003 10:57 AM
On serial 0/0 you have clock-source internal configured , make sure that the router on the other side is configured for clock source external or network , I am not sure of the exact syntax. Also the keepalive on that serial interface must be 10 seconds if it is not already , the keepalived and encap must match on both routers
10-08-2003 12:27 PM
Hey deilert,
Guess what before I went over to the remote site, I Changed the encapsulation to PPP instead of HDLC on the serial port, guess what the line protocol came up. I can ping the remote router, also I could ping the T1 WIC interface from my workstation. But I still can't ping the T1 WIC from the router itself, is this normal?
10-08-2003 03:03 PM
are you pinging like this
router > ping 10.1.11.1
.....
router>
When you ping your own interface the pings travel to the serial interface at the remote end then comes back . If you can ping the remote serial interface you should be able to ping your own serial interface .
10-09-2003 02:59 AM
Hey Deilert,
Could it possibly be bacause I have the two ip address set in the same subnet.
The serial interface on my end is set for 10.1.11.1/24
The serial interface on the remote end is set for 10.1.11.2/16.
Could this possibly be the problem
Thanks again
10-09-2003 03:51 AM
yes
this needs to be corrected , I am suprised you can ping the remote end , make both end /24 this should hook you up .
10-09-2003 06:21 AM
Hi,
I have both end set to 24 and still can't ping to the T1 interface.
10-09-2003 06:40 AM
can you paste in a sh ip route 10.1.11.1 & 10.1.11.2 on both routers
10-09-2003 07:55 AM
Hi, Here it is, Note: 10.1.11.2 is a 3com router.
IP Route on 10.1.11.1
10.0.0.0/8 is variably subnetted, 3 subnets, 3 masks
C 10.1.11.0/24 is directly connected, Serial0/0
C 10.1.11.2/32 is directly connected, Serial0/0
C 10.5.0.0/16 is directly connected, FastEthernet0/0
192.168.0.0/26 is subnetted, 1 subnets
S 192.168.0.0 [1/0] via 10.1.11.2
IP Routing Table for 10.1.11.2 - 3Com Router
-------------------------------IP Routing Table--------------------------------
Total Routes = 3, Total Direct Networks = 2
Destination Mask Gateway Metric Status TTL Source
10.1.11.0 255.255.255.0 10.1.11.2 0 Up -- Connected
192.168.0.0 255.255.255.0 192.168.0.49 0 Up -- Connected
192.168.141.0 255.255.255.0 !4 1 -- -- Static
10-09-2003 07:58 AM
Ok now it is a little clearer , You have a cisco connected to a 3com , If this is true you must use PPP , hdlc is vendor specific, try this and see what happens
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