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What cable I need to connect 2600 to 2500 router? 4

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ejeangilles

ejeangilles

Technical User
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I have a lab that I'm doing some testing on with static routing. I have 3 2500's and 1 2600. I connected all my 2500's via dte/dce cables but I'm not sure how to connect my 2600 to my 2500. My 2600 has a fast ethernet connection. Can I plug a crossover cable from my 2600 into the transceiver port on my 2500? Or do I need a serial card to put in my 2600?
 
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Hello
Yes!You can use the crossover cable to connect them.No need to buy a WIC-1T/2T.It will let you route the same.
Regards
 
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Thanks...Also, is that a regular crossover or T1 crossover?
 
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Regular crossover---pin1 gets crossed with 3, and 2 with 6. A T1 is 1 with 3 and 4 with 5, I believe...

Burt
 
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For future reference, if you're using Ethernet, then you use an Ethernet crossover. If you're using a serial T1, use a T1 crossover. They're very different technologies.
 
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ejeangilles,

Did you ever get your 2600s and 2500 routers to exchange routing tables via serial link? Have a 2611 and 2620 and when I connect via serial a 2503 find that neither 2600 will update the routing table via the serial, while the 2503 happily updates it routing table via the serial. It doesn't seem to matter which routing protocol I use the 2600s won't update from the 2503. Seem to be an incompatibility issue between 2600/2500.

TIA,

Glenn
 
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Glenn, there is no incompatibility between the two routers. Can you ping each router from the other router?
 
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jneiberger,

Thanks for the reply.

As you'll see from the details below, C2503 can ping its own Ethernet address, but not its own Serial address or the address of C2611 (when attached). Similarly, C2611 pings its own Ethernet address, but not its own Serial or C2503.

You'll also see that when I attach C2620/C2611 both can ping their Serial address and the remote address.

Note: I only have the one serial cable and the 2600 series routers only have one serial interface so can only attach two routers together.

Glenn

C2503#show ip int brief
Interface IP-Address OK? Method Status Protocol
Ethernet0 192.168.4.254 YES NVRAM up up
Serial0 192.168.254.3 YES NVRAM up up

C2503#show ip route
Gateway of last resort is not set
I 192.168.2.0/24 [100/8576] via 192.168.254.2, 00:00:50, Serial0
I 192.168.3.0/24 [100/8576] via 192.168.254.2, 00:00:50, Serial0
C 192.168.4.0/24 is directly connected, Ethernet0
C 192.168.254.0/24 is directly connected, Serial0

C2503#ping 192.168.4.254
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.4.254, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms
C2503#ping 192.168.254.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.254.3, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
C2503#ping 192.168.254.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.254.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)

C2611#show ip int brief
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 192.168.2.254 YES NVRAM up up
Serial0/0 192.168.254.2 YES NVRAM up up
Ethernet0/1 192.168.3.254 YES NVRAM
up up

C2611#show ip route
Gateway of last resort is not set
C 192.168.254.0/24 is directly connected, Serial0/0
C 192.168.2.0/24 is directly connected, Ethernet0/0
C 192.168.3.0/24 is directly connected, Ethernet0/1

C2611#ping 192.168.2.254
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.2.254, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
C2611#ping 192.168.3.254
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.3.254, timeout is 2 seconds:
!!!!!
C2611#ping 192.168.254.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.254.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
C2611#ping 192.168.254.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.254.3, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms
-----------------------------------------------------
C2620>show ip int brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 192.168.1.245 YES NVRAM up up
Serial0/0 192.168.254.1 YES NVRAM up up

C2620>show ip route
Gateway of last resort is not set
C 192.168.254.0/24 is directly connected, Serial0/0
C 192.168.1.0/24 is directly connected, FastEthernet0/0
D 192.168.2.0/24 [90/2195456] via 192.168.254.2, Serial0/0
D 192.168.3.0/24 [90/2195456] via 192.168.254.2, Serial0/0

C2620>ping 192.168.1.245
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.245, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
C2620>ping 192.168.254.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.254.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/8 ms
C2620>ping 192.168.254.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.254.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/3/4 ms

C2611>show ip int brief
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 192.168.2.254 YES NVRAM up up
Serial0/0 192.168.254.2 YES NVRAM up up
Ethernet0/1 192.168.3.254 YES NVRAM up up

C2611>show ip route
Gateway of last resort is not set
C 192.168.254.0/24 is directly connected, Serial0/0
D 192.168.1.0/24 [90/2172416] via 192.168.254.1, 00:04:54, Serial0/0
C 192.168.2.0/24 is directly connected, Ethernet0/0
C 192.168.3.0/24 is directly connected, Ethernet0/1

C2611>ping 192.168.254.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.254.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/8 ms
C2611>ping 192.168.254.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.254.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
 
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Please post a show interface and a show run for your serial interfaces so we can have a look.

Also, as a bit of trivia related to this, when you ping a local serial interface on a Cisco router, the ICMP packet actually leaves the router, travels to the other side of the link, returns to the router (which replies), then travels to the far side and back again. So, if you ping a local interface, the packet actually makes four trips down the wire before you get a response.
 
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jneiberger,

Will post show int and show run next week, as will be away from tomorrow until Tuesday.

Thanks for the trivia, which seems to confirm that there is an issue with the 2503 sending routing updates, i.e. nothing seems to pass down the wire.

Burt,

Did see your posting, but have not found anything regarding frame relay issue and don't know anyone with CCO account.
Update issue is same regardless of whichever routing protocol issue used, i.e. RIP, IGRP, EGIRP.
 
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So you did configure with RIP V1? The whole idea is to try a classful protocol, but I am surprised that OSPF didn't receive updates.
I would think it's a split-horizon issue on the 2500, so you won't get this with a link state protocol.
Just for kicks, have you tried "no ip split-horizon"? Also, are you at least able to reach 3.0 with a static route in place (ip route 192.168.23.0 255.255.255.0 192.168.2.2)?

Burt
 
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One more thing---default routes, and redistribute static, see what gets populated...

Burt
 
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jneiberger, details as requested.

C2611#show run int serial 0/0
Building configuration...

Current configuration:
!
interface Serial0/0
ip address 192.168.254.2 255.255.255.0
no ip directed-broadcast
no ip split-horizon
no keepalive
clockrate 2000000
lan-name SER0

C2611#show int serial 0/0
Serial0/0 is up, line protocol is up
Hardware is PowerQUICC Serial
Internet address is 192.168.254.2/24
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255
Encapsulation HDLC, loopback not set, keepalive not set
Last input never, output 00:00:02, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0 (size/max/drops); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
2387 packets output, 192326 bytes, 0 underruns
0 output errors, 0 collisions, 5 interface resets
0 output buffer failures, 0 output buffers swapped out
12 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up

C2503#show run
Building configuration...

.
.
!
interface Serial0
ip address 192.168.254.3 255.255.255.0
no ip route-cache
no ip split-horizon
no ip mroute-cache
no keepalive
!
interface Serial1
no ip address
no ip route-cache
no ip mroute-cache
shutdown
!
.
.

C2503#show int serial 0
Serial0 is up, line protocol is up
Hardware is HD64570
Internet address is 192.168.254.3/24
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255
Encapsulation HDLC, loopback not set, keepalive not set
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0 (size/max/drops); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
2096 packets input, 166844 bytes, 0 no buffer
Received 259 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
3873 packets output, 442163 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up

Burt, as you'll see from details above I have config'd 'no ip split-horizon' on both routers (C2611/C2503) but this didn't appear to make any difference. Have not config'd OSPF as don't know how at this stage.

Config'd static route on C2611 to network 192.168.4.0 via serial, but C2503 interface 192.168.4.254 did not respond to any ping request. Did also config redistribute but this made no difference.

C2503#show 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
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
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, o - ODR

Gateway of last resort is not set

S 192.168.4.0/24 [2/0] via 192.168.254.3, Serial0/0
C 192.168.254.0/24 is directly connected, Serial0/0
C 192.168.2.0/24 is directly connected, Ethernet0/0
C 192.168.3.0/24 is directly connected, Ethernet0/1
C2611#ping 192.168.4.254

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.4.254, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)

Have also issued 'ip default-gateway 192.168.254.3' command on C2611. No fault reported when issuing command, but 'show ip route' still does not list gateway of last resort.

TIA.
 
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It looks to me like you have either a bad cable or a bad serial interface. Serial0/0 on your 2611 is not recording any incoming frames.
 
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I can lab this up later---I have a 2503 and some 1720's, 2620's, 3640, etc.

Burt
 
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Burt, be sure to use a bad cable like he is. ;-)
 
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Burt, have checked interface stats and can confirm that when connecting C2611/C2620 both report sending/receiving packets. However, when using C2503 and C2611/C2620 only the C2503 reports receiving. Would indicate cable fault, except cable works fine for C2611/C2620. Presume there is a difference in serial interface between C2500 and C2600?

C2611>show int serial 0/0
Serial0/0 is up, line protocol is up
58 packets input, 5406 bytes, 0 no buffer
Received 9 broadcasts, 0 runts, 0 giants, 0 throttles
1 input errors, 0 CRC, 1 frame, 0 overrun, 0 ignored, 0 abort
58 packets output, 6954 bytes, 0 underruns

C2620>show int serial 0/0
Serial0/0 is up, line protocol is up
63 packets input, 7302 bytes, 0 no buffer
Received 20 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
65 packets output, 6671 bytes, 0 underruns
=======================================================
C2611>show int serial 0/0
Serial0/0 is up, line protocol is up
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
33 packets output, 3826 bytes, 0 underruns

C2503>show int serial 0
Serial0 is up, line protocol is up
38 packets input, 3732 bytes, 0 no buffer
Received 13 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
61 packets output, 5296 bytes, 0 underruns
 
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There is no significant difference between the serial interfaces. If you're not getting any traffic at all on that one interface, that indicate to me that either that interface has a broken "receiver" or the opposite interface has a broken "sender".

What clock rate are you using?

Do you have the proper cables in order to try switching the DCE and DTE roles?
 
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