Basic connectivity issue

TehToG

I have a 2950, 2610 and 2651XM.

The 2950 is running IOS 12.1(22)EA14
The 2610 is running IOS 12.3(26)
The 2951 is running IOS 12.4(19)

A port on the 2950 connects to the ethernet on the 2610. It's configured as a standard switchport (no trunk). The 2610 interface has the following config.

IP address 10.200.10.50 255.255.255.0
full duplex

The device is now part of the 10.200.10.0/24 network. It's able to ping other devices etc (all on vlan1). CDP is enabled and functional on the connected devices.



Now doing the exact same thing with the 2651XM doesn't work. The router can ping 10.200.10.60 (it's ip) but it can't reach 10.200.10.1 (the switch). CDP does not work, both devices sent CDP packets and never recieve anything back. When checking out the interfaces both the interface and line protocol is up.

also connecting a pc using a crossover and picking an ip on the same subnet as the router doesn't allow any connectivity.

Any ideas?

spd3432

Let me know if I have this correct.
2950 (switch) -- vlan1 IP 10.200.10.1/24
2610 (e0/0) -- IP 10.200.10.50/24
2651 (f0/0) -- IP 10.200.10.60/24

Can you do a show run on the 2651 and paste that portion from it that pertains to f0/0 ?

TehToG

Switch interface counters 5minutes

FastEthernet0/14 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is 000f.90cb.e10e (bia 000f.90cb.e10e)
Description: ## Users ##
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, media type is 100BaseTX
input flow-control is unsupported output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:46:12, output 00:00:01, output hang never
Last clearing of "show interface" counters 00:04:57
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
37 packets input, 4435 bytes, 0 no buffer
Received 8 broadcasts (7 multicast)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 7 multicast, 0 pause input
0 input packets with dribble condition detected
194 packets output, 16054 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

Router interface counters 5minutes

FastEthernet0/1 is up, line protocol is up
Hardware is AmdFE, address is 0013.1a24.cae1 (bia 0013.1a24.cae1)
Internet address is 10.200.10.80/24
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 00:00:11, output 00:00:01, output hang never
Last clearing of "show interface" counters 00:05:27
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, 10024 bytes
Received 26 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
45 packets output, 5063 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
18 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
4 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out

TehToG

spd3432 wrote: »

Let me know if I have this correct.
2950 (switch) -- vlan1 IP 10.200.10.1/24
2610 (e0/0) -- IP 10.200.10.50/24
2651 (f0/0) -- IP 10.200.10.60/24

Can you do a show run on the 2651 and paste that portion from it that pertains to f0/0 ?

I've changed it slightly to i can run testing. F0/1 on 2651xm is now 10.200.10.80/24. f0/0 is now shut. The rest is correct.


From the Router config. Everything else is as if the router has just been booted

interface FastEthernet0/1
ip address 10.200.10.80 255.255.255.0
duplex auto
speed auto
!

TehToG

It's looking like the routers FastEthernet interfaces are faulty. I can't get any connectivity over them. I set it up IDENTICALLY like this and couldn't ping either gateway on the router nor could i ping between the two hosts.

Anyone agree/disagree before i send this back?

JeanM

Have you tested the eth/fasteth ports on the routers individually by assigning the ip on the same subnet as on the pc and connected a pc to it?

Just rule things out by testing one device at a time basically.

TehToG

yup. I did this, no reply to ping. Tried both straight through cable and crossover (incase my card did/didn't support auto mdix, Turns out it does)

JeanM

TehToG wrote: »

yup. I did this, no reply to ping. Tried both straight through cable and crossover (incase my card did/didn't support auto mdix, Turns out it does)

firewall on the pc is off right? when you are pinging the pc. you are saying CDP is working so the devices discover the directly connected end?

TehToG

Firewall is off. CDP does NOT work. The switch and router are both sending CDP discovery packets but not getting replies. There is no entry in the windows pc or routers arp table for the other.

Computer 10.10.10.1 /24
Router 10.10.10.2 /24

spd3432

I don't have a 2651xm but I just took one of my 2620xm routers. Set speed and duplex on both the router interface and switchport to 100/full and put the switchport into vlan 1. I was able to ping. I changed the switchport to vlan 4 and was still able to ping. I changed the speed and duplex on both the switch and router to auto/auto and ping broke even though both sides of the connection (sh ip int bri) show up/up. Set the speed and duplex on both the router and switch and see what happens.

TehToG

Speed and duplex have been set. no difference. Device does not respond to arp requests, to definetly broken.

spd3432

I don't think it's broken since the cut you showed from the interface showed it was getting broadcasts and it's in an up/up status. Is cdp enabled on all devices? If it's not enabled, you'll get a response saying "cdp is not enabled" when you attempt to run "sh cdp nei".
Will you add a few more config cuts?
Switch - "sh run interface f0/1"
Switch - "sh mac-address table"
Switch - "sh ip int bri f0/1"
Router - "sh run interface f0/0"
Router - "sh ip int bri f0/0"
Router and Switch - "sh cdp"

TehToG

CDP is enabled on both devices and interfaces. It works flawlessly between the switch and other devices. The Router isn't working as it should, you can see SOMETHING is getting through but not everything.

Lets ignore CDP for the minute, and go back to basic connectivity. If we can't details the arp table, how is CDP ever going to work?