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CDP problem between 2950 switch & 2620 router

I have a Catalyst 2950 - 24 port switch and it is connected to a Cisco 2620 router. When I am on the 2620 and type show CDP neighbour I can see the 2950 switch, then I console onto the switch and type show CDP neighbour I am unable to see the router.

Can anyone please assist in this matter because I am at lost to resolve this problem.

Thanks

16 REPLIES
Silver

Re: CDP problem between 2950 switch & 2620 router

It seems you have a one way circuit. The Tx from the router to the Rx on the switch is broken . Are you hard coded on your speeds and duplex settings ? If so try swapping the cable .

New Member

Re: CDP problem between 2950 switch & 2620 router

Thanks for replying. The switch port where the router is located the speed and duplex settings are not hard coded. Also I ran debug CDP packet and CDP packets are sent out of the port

Silver

Re: CDP problem between 2950 switch & 2620 router

I would hard code , reset the port . If you still do not get CDP swap the cablel

New Member

Re: CDP problem between 2950 switch & 2620 router

I have hard code, reset port, changed cable and restart switch and still do not get any CDP

Silver

Re: CDP problem between 2950 switch & 2620 router

I would

1. move to a different sw port

2. move to a differnet port on router

New Member

Re: CDP problem between 2950 switch & 2620 router

Move to a different switch port same result. Unable to move to different router only one available. I have just tried attaching a 1750 router to the switch and it works ok, could it be an IOS problem with the 2620 router? Current IOS on 2620 flash:c2600-i-mz.121-9.bin

Silver

Re: CDP problem between 2950 switch & 2620 router

On your router clear counters do a sh int ethernet x

Do you see the output packets incrementing ?

Can you paste in an out put form the sh int Ehternet xx

New Member

Re: CDP problem between 2950 switch & 2620 router

h int f0/0

FastEthernet0/0 is up, line protocol is up

Hardware is AmdFE, address is 00d0.bbd3.26c0 (bia 00d0.bbd3.26c0)

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)

Full-duplex, 100Mb/s, 100BaseTX/FX

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:06, output 00:00:03, output hang never

Last clearing of "show interface" counters 00:01:18

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

8 packets input, 785 bytes

Received 8 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

10 packets output, 1108 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out

Silver

Re: CDP problem between 2950 switch & 2620 router

Can you post the sh int from the switch

Silver

Re: CDP problem between 2950 switch & 2620 router

I did find a bug you may be hitting CSCdk47710

New Member

Re: CDP problem between 2950 switch & 2620 router

Hi can you you explain please

New Member

Re: CDP problem between 2950 switch & 2620 router

Cisco has a known bug listed before that affected the ethernet port of the 2620 router. If you do a show diag, and under the parts number, if you see 73-2843-03, you have the bug.

ROUTER#sh diag

Slot 0:

C2620 1FE Mainboard Port adapter, 2 ports

Port adapter is analyzed

Port adapter insertion time unknown

EEPROM contents at hardware discovery:

Hardware revision 1.0 Board revision A0

Serial number 3364712934 Part number 73-2843-03

Test history 0x0 RMA number 00-00-00

EEPROM format version 1

EEPROM contents (hex):

0x20: 01 94 01 00 C8 8D 71 E6 49 0B 1B 03 00 00 00 00

0x30: 50 17 6C 06 00 00 00 00 00 00 00 00 00 00 00 00

WIC Slot 0:

FT1 WAN daughter card

Hardware revision 1.3 Board revision B0

Serial number 13879670 Part number 800-03279-03

Test history 0x0 RMA number 00-00-00

Connector type Wan Module

EEPROM format version 2

EEPROM contents (hex):

0x20: 02 11 01 03 00 D3 C9 76 50 0C CF 03 00 00 00 00

0x30: 58 00 00 00 99 04 15 01 FF FF FF FF FF FF FF FF

The only fix is to replace the router.

New Member

Re: CDP problem between 2950 switch & 2620 router

sh int f0/1

FastEthernet0/1 is up, line protocol is up

Hardware is Fast Ethernet, address is 000c.ce2d.6d01 (bia 000c.ce2d.6d01)

MTU 1500 bytes, BW 100000 Kbit, DLY 1000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100Mb/s

input flow-control is off, output flow-control is off

ARP type: ARPA, ARP Timeout 04:00:00

Last input never, output 00:00:01, output hang never

Last clearing of "show interface" counters 00:04:19

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

26 packets input, 2936 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

4 input errors, 4 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 0 multicast, 0 pause input

0 input packets with dribble condition detected

193 packets output, 14297 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier, 0 PAUSE output

0 output buffer failures, 0 output buffers swapped out

New Member

Re: CDP problem between 2950 switch & 2620 router

Thanks you for your assistance

Silver

Re: CDP problem between 2950 switch & 2620 router

.

New Member

Re: CDP problem between 2950 switch & 2620 router

I see in your post that you swapped ports, but I didn't see you state where you swapped out the cable. I noticed that you have CRC errors on one of the interfaces. I often suspect physical layer problems when I see them.

Try a new cable if you have not already done so.

Am I reading something incorrectly, or does the bug apply to Catalyst 8540 switches only?

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