12-06-2013 06:27 AM - edited 03-07-2019 04:57 PM
I have a cisco 881W which seems to have an issue connecting to s 3COM Smart switch. Systems connected to the 3COM would not register an ip address. HOwever if i switch the 3COM to a unmanaged switch, the problems dissapears. I was wondering if there is a configuration that is needed to ensure than the cisco 881W can communicate with a smart switch. The WAM connection is coming from a modem with ADSL
This is my current configuration.
Any help would be gratefull.
version 15.2
!
hostname yourname
!
boot-start-marker
boot-end-marker
!
!
logging buffered 51200 warnings
!
no aaa new-model
!
!
!
ip dhcp excluded-address 10.10.10.51 10.10.10.254
!
ip dhcp pool ccp-pool
import all
network 10.10.10.0 255.255.255.0
default-router 10.10.10.1
dns-server 202.188.0.133 8.8.8.8
lease infinite
!
!
!
ip domain name yourdomain.com
ip name-server 202.188.0.133
ip name-server 8.8.8.8
ip cef
no ipv6 cef
interface FastEthernet0
no ip address
!
interface FastEthernet1
no ip address
!
interface FastEthernet2
no ip address
!
interface FastEthernet3
switchport mode trunk
no ip address
!
interface FastEthernet4
ip address dhcp
ip nat outside
ip virtual-reassembly in
duplex auto
speed auto
!
interface Wlan-GigabitEthernet0
description Internal switch interface connecting to the embedded AP
no ip address
!
interface wlan-ap0
description Service module interface to manage the embedded AP
ip unnumbered Vlan1
!
interface Vlan1
ip address 10.10.10.1 255.255.255.0
ip directed-broadcast
no ip proxy-arp
ip nat inside
ip virtual-reassembly in
ip tcp adjust-mss 1452
!
ip forward-protocol nd
ip http server
ip http authentication local
ip http secure-server
ip http timeout-policy idle 60 life 86400 requests 10000
!
ip nat inside source list 199 interface FastEthernet4 overload
!
access-list 199 permit ip any any
no cdp run
!
!
!
line con 0
login local
no modem enable
line aux 0
line 2
no activation-character
no exec
transport preferred none
transport input all
stopbits 1
line vty 0 4
privilege level 15
login local
transport input telnet ssh
line vty 5 15
access-class 23 in
privilege level 15
login local
transport input telnet ssh
!
scheduler allocate 20000 1000
!
end
12-09-2013 02:01 PM
Hello Bryan.
It could be the interface going into err-disable, maybe the interface stays down due to spanning-tree or some kind of incompatibility.
Can you recreate the issue?
Can you post the output of the show interface command when the issue is happening?
Can you post the output of the show interface status err-disable ?
... Show log
Regards.
Wilson B.
12-09-2013 04:49 PM
Thanks for the reply Wilson.
Do you want the output from the 3COM switch or the Cisco Router.
And how do i go around showing these logs?
Sorry for these question. I am new to this.
Thanks
Bryan Looi
12-09-2013 04:58 PM
Bryan,
Wilson is asking you to run the commands show interfaces and show interfaces status err-disabled from the CLI and post the output.
You might also make sure the 3COM switch does not have any conflicting VLAN configuration.
12-09-2013 05:52 PM
Hello,
It would be good if you also run a debug dhcp for the client process on that interface.
As a side note to the main discussion:
Using a permit ip any any for the NAT setup will cause way to many issues.
Be as specific as possible and never use any as the source.
Remember to rate all of our posts.
Regards.
Jcarvaja
Sent from Cisco Technical Support Android App
12-09-2013 06:00 PM
Thanks all.
Addressing wilson's request. When i try
show interface status err-disable nothing appears.
This is the show interface.
Here are the configurations.
FastEthernet0 is down, line protocol is down
Hardware is Fast Ethernet, address is c067.af1c.4bc6 (bia c067.af1c.4bc6)
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Auto-duplex, Auto-speed
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, output hang never
Last clearing of "show interface" counters never
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
1865454 packets input, 237913828 bytes, 0 no buffer
Received 270 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
1793228 packets output, 723463102 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
1 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
FastEthernet1 is up, line protocol is down
Hardware is Fast Ethernet, address is c067.af1c.4bc7 (bia c067.af1c.4bc7)
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Auto-duplex, Auto-speed
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, output hang never
Last clearing of "show interface" counters never
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
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 unknown protocol drops
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
FastEthernet2 is up, line protocol is down
Hardware is Fast Ethernet, address is c067.af1c.4bc8 (bia c067.af1c.4bc8)
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Auto-duplex, Auto-speed
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, output hang never
Last clearing of "show interface" counters never
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
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 unknown protocol drops
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
FastEthernet3 is up, line protocol is up
Hardware is Fast Ethernet, address is c067.af1c.4bc9 (bia c067.af1c.4bc9)
MTU 1500 bytes, BW 100000 Kbit/sec, 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
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, output hang never
Last clearing of "show interface" counters never
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 4000 bits/sec, 7 packets/sec
5 minute output rate 119000 bits/sec, 12 packets/sec
850987 packets input, 83160538 bytes, 0 no buffer
Received 1624 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
1062568 packets output, 438702498 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 unknown protocol drops
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
FastEthernet4 is up, line protocol is up
Hardware is PQ3_TSEC, address is c067.af1c.4bca (bia c067.af1c.4bca)
Internet address is 192.168.1.2/24
MTU 1500 bytes, BW 100000 Kbit/sec, 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 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
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 118000 bits/sec, 12 packets/sec
5 minute output rate 3000 bits/sec, 7 packets/sec
4347982 packets input, 2792086202 bytes
Received 11 broadcasts (0 IP multicasts)
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
4338620 packets output, 945319234 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
NVI0 is administratively down, line protocol is down
Hardware is NVI
MTU 1514 bytes, BW 56 Kbit/sec, DLY 5000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation UNKNOWN, loopback not set
Keepalive set (10 sec)
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
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 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
Vlan1 is up, line protocol is up
Hardware is EtherSVI, address is c067.af1c.4bc6 (bia c067.af1c.4bc6)
Description: $ETH-SW-LAUNCH$$INTF-INFO-HWIC 4ESW$
Internet address is 10.10.10.1/24
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not supported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output never, output hang never
Last clearing of "show interface" counters never
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 7000 bits/sec, 10 packets/sec
5 minute output rate 132000 bits/sec, 12 packets/sec
4426572 packets input, 971501619 bytes, 0 no buffer
Received 2916 broadcasts (660 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
4382063 packets output, 2794285378 bytes, 0 underruns
0 output errors, 1 interface resets
14 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
Wlan-GigabitEthernet0 is up, line protocol is up
Hardware is WLAN Gigabit Ethernet, address is c067.af1c.4bca (bia c067.af1c.4bca)
Description: Internal switch interface connecting to the embedded AP
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:19, output never, output hang never
Last clearing of "show interface" counters never
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 1000 bits/sec, 2 packets/sec
5 minute output rate 2000 bits/sec, 3 packets/sec
1741190 packets input, 671924153 bytes, 0 no buffer
Received 1071 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
1858154 packets output, 1694495886 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
2496 unknown protocol drops
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
wlan-ap0 is up, line protocol is up
Hardware is wlan-ap
Description: Service module interface to manage the embedded AP
Interface is unnumbered. Using address of Vlan1 (10.10.10.1)
MTU 1514 bytes, BW 8000000 Kbit/sec, DLY 5000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation LOOPBACK, loopback not set
Keepalive set (10 sec)
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/0 (size/max)
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 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
Addressing Daniel's question. The VLAN on the switch is already at VLAn 1, untagged. I firts though this was the problem as well, however, i used this setup on my old 871W router and there was no problem. Also connecting the cable modem direct to the switch also works. Only when the cisco rouiter is placed in between the cable moem and switch problem occurs.
Addressing Julio. How do i go about running a debug DHCP? and I was not to osure about tha NAT. So i used my old configurations which NAT was enabled for the WAN interface FE4 and also NAT for the inside traffic. How to i specify?
Thanks all for the help. Really appreciate it.
12-09-2013 06:13 PM
Hello bud,
It seems it has an IP address.
So u are missing just thr route
Ip route 0.0.0.0 0.0.0.0 fasteth 0/4
For the nat
Ip access-list extended NAT
Permit ip inside_Subnet any
Ip nat inside source list NAT int fa 0/4 overload
Rate all of the helpful posts buddy
Sent from Cisco Technical Support Android App
12-09-2013 06:18 PM
Hey Julio,
How to I enable the route?
But I can use an unmanaged switch and it will work fine. Only with this 3COM smart switch, the problem persist.
The NAT if i leave it it should be fine correct?
Thanks Julio for all the help. Really appreciate it
12-09-2013 06:22 PM
Leave the nat the way it is for the moment.
For the route
Config te
Ip route 0.0.0.0 0.0.0.0 x.x.x.x
Where x.x.x.x is the IP address of the ISP modem.
If u do noy have it use
Ip route 0.0.0.0 0.0.0.0 fast 0/4
Sent from Cisco Technical Support Android App
12-09-2013 06:34 PM
Hey Julio
But isnt this config for the ISP modem to the router? For the WAN interface?
Currently the issue isnt here. I can connect to the ISP modem.
Or is this the commands to speccify an IP for the lan interfaces. Currently all my interfaces have no ip address. But i think the VLAN is assignned to the ports. So thats how im getting internet and IP address.
Why is that when i use an unmanaged switch it works?
Thanks for all your help.
12-09-2013 06:43 PM
Hello.
So I misunderstood ur post..
Thanks for the explanation.
Also share
Show interface fas x/x switchport
Where x/x is the interface connected to the switch
This a really fair and simple configuration.
I do not think the issue is on this device but
Then provide us
show interfaces status err-disabled
Show run interface fastethernet x/x
Where x/x is the interface going to the switch.
Sent from Cisco Technical Support Android App
12-09-2013 09:05 PM
Hello Julio
The commands above return an error. And the err-disabled command return a blnk screen. So im not too sure what is going on.
Thanks
Bryan Looi
12-09-2013 09:06 PM
Hello,
so if you do show interface fast 0/x switchport you get an syntax error??
What's the interface connecting to the switch???
Rate all of the helpful posts!!!
Regards,
Jcarvaja
Follow me on http://laguiadelnetworking.com
12-09-2013 09:43 PM
Hello Julio
Yes, Running
show interface fast 0/x switchport
Gets me an error
Its connected to FA0 currently. This problem only occurs on this switch, On an unmanaged switch, no problem.
12-09-2013 09:44 PM
Hello Bryan,
Then share
show interface fas 0 switchport
show run interface fast 0
show interface fas 0
Rate all of the helpful posts!!!
Regards,
Jcarvaja
Follow me on http://laguiadelnetworking.com
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