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Community Member

GNS3 3745 - No Switch Connectivity

Hi All,

am using GNS3, and have the 16port switching module. I have created a PC instance and connecting to f/0/0 which is a layer 3 port, I can connect via layer 3 IPs. I then reconfigured and connected the PC instance via a layer 2 port f2/0 which is part of the 16port switch module. All 16 ports are by default in vlan 1. I assigned an IP of 10.1.9.1/24 to the VLAN and gave the PC 10.1.9.2/24. I cannot ping and I cannot even ping 10.1.9.1, the VLAN 1 IP. Have I missed something? Thanks.

Mark Sargent

Router#sh ver

Cisco IOS Software, 3700 Software (C3745-SPSERVICESK9-M), Version 12.4(19), RELEASE SOFTWARE (fc1)

Router#ping 10.1.9.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.1.9.1, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

Router#sh arp

Protocol  Address          Age (min)  Hardware Addr   Type   Interface

Internet  10.1.9.1                -   c402.2668.0000  ARPA   Vlan1

Router#sh ip int br

Interface                  IP-Address      OK? Method Status                Protocol

FastEthernet0/0            unassigned      YES manual up                    up 

Serial0/0                  unassigned      YES unset  administratively down down

FastEthernet0/1            unassigned      YES unset  administratively down down

Serial0/1                  unassigned      YES unset  administratively down down

FastEthernet2/0            unassigned      YES unset  up                    down

FastEthernet2/1            unassigned      YES unset  up                    down

FastEthernet2/2            unassigned      YES unset  up                    down

FastEthernet2/3            unassigned      YES unset  up                    down

FastEthernet2/4            unassigned      YES unset  up                    down

FastEthernet2/5            unassigned      YES unset  up                    down

FastEthernet2/6            unassigned      YES unset  up                    down

FastEthernet2/7            unassigned      YES unset  up                    down

FastEthernet2/8            unassigned      YES unset  up                    down

FastEthernet2/9            unassigned      YES unset  up                    down

FastEthernet2/10           unassigned      YES unset  up                    down

FastEthernet2/11           unassigned      YES unset  up                    down

FastEthernet2/12           unassigned      YES unset  up                    down

FastEthernet2/13           unassigned      YES unset  up                    down

FastEthernet2/14           unassigned      YES unset  up                    down

FastEthernet2/15           unassigned      YES unset  up                    down

Vlan1                      10.1.9.1        YES manual up                    down

Router#sh int f2/0 switchport

Name: Fa2/0

Switchport: Enabled

Administrative Mode: static access

Operational Mode: down

Administrative Trunking Encapsulation: dot1q

Negotiation of Trunking: Disabled

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 1 (default)

Trunking VLANs Enabled: ALL

Trunking VLANs Active: none

Priority for untagged frames: 0

Override vlan tag priority: FALSE

Voice VLAN: none

Appliance trust: none

VLAN Name                             Status    Ports

---- -------------------------------- --------- -------------------------------

1    default                          active    Fa2/0, Fa2/1, Fa2/2, Fa2/3

                                                Fa2/4, Fa2/5, Fa2/6, Fa2/7

                                                Fa2/8, Fa2/9, Fa2/10, Fa2/11

                                                Fa2/12, Fa2/13, Fa2/14, Fa2/15

1002 fddi-default                     active

1003 token-ring-default               active

1004 fddinet-default                  active

1005 trnet-default                    active

VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1 Trans2

---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------

1    enet  100001     1500  -      -      -        -    -        1002   1003

1002 fddi  101002     1500  -      -      -        -    -        1      1003

1003 tr    101003     1500  1005   0      -        -    srb      1      1002

1004 fdnet 101004     1500  -      -      1        ibm  -        0      0

1005 trnet 101005     1500  -      -      1        ibm  -        0      0

Router#sh int vlan 1

Vlan1 is up, line protocol is down

  Hardware is EtherSVI, address is c402.2668.0000 (bia c402.2668.0000)

  Internet address is 10.1.9.1/24

  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

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

  Encapsulation ARPA, loopback not set

  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 runts, 0 giants, 0 throttles

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

     12 packets output, 890 bytes, 0 underruns

     0 output errors, 1 interface resets

     0 unknown protocol drops

     0 output buffer failures, 0 output buffers swapped out

Everyone's tags (6)
1 ACCEPTED SOLUTION

Accepted Solutions

GNS3 3745 - No Switch Connectivity

you definitely need to change cable

apart this i would configure the interface in this way:

int fa2/0

sw mo acc

sw acc vla 1

sh

no sh

end

!

wr

!

Take Care

Alessio

7 REPLIES
Community Member

GNS3 3745 - No Switch Connectivity

"Operational Mode: down" worries me. Shouldn't is say "static access"? Thanks.

Mark Sargent

Purple

GNS3 3745 - No Switch Connectivity

Hi,

yes it should and that's also why the SVI is down.Can you post your GNS3 file.

Regards.

Alain.

Don't forget to rate helpful posts.

Don't forget to rate helpful posts.
Community Member

Re: GNS3 3745 - No Switch Connectivity

cadet alain wrote:

Hi,

yes it should and that's also why the SVI is down.Can you post your GNS3 file.

Regards.

Alain.

Don't forget to rate helpful posts.

Do you mean the topology file for GNS3 for this lab? Thanks.

Mark

GNS3 3745 - No Switch Connectivity

you definitely need to change cable

apart this i would configure the interface in this way:

int fa2/0

sw mo acc

sw acc vla 1

sh

no sh

end

!

wr

!

Take Care

Alessio

Community Member

Re: GNS3 3745 - No Switch Connectivity

Alessio Andreoli wrote:

you definitely need to change cable

apart this i would configure the interface in this way:

int fa2/0

sw mo acc

sw acc vla 1

sh

no sh

end

!

wr

!

Take Care

Alessio

EDIT: Well, the below changes seemed to work as I can now ping 10.1.9.1 which I couldn't before. Thanks.

Mark

---

Change the cable? In a GNS3 lab, you're kidding, yes?

Why do I need to tell the router f2/0 is in access mode as it shows in the initial output i posted that it is. It also shows that f2/0 is assigned to vlan 1, which is default by the way...

what is,

"sh"

"no sh"

The interface shows as up already...

Thanks.

Mark

Silver

set speed and duplex - it

set speed and duplex - it will bring it up interface and once vlan has active interface, vlan protocol status will be up.

 

 

conf t

!

vlan {vlan id}

   name

!

int {interface #}

switchport access vlan {vlan id}

speed 100

duplex f

shut

no shut

 

this config will be at switch side.

Community Member

Re: set speed and duplex - it

OMG!! I had same issue where the directly connected physical interface was in up/down state.  it drove me crazy because I knew there was nothing special about the configurations but could not understand why. Vlan 10 was up/up and I had interfaces in vlan 10.


As for me, I had created a another vlan just to get away from default vlan 1. I started switching back and forth to see what works.  I changed the native vlan's but no change back and forth from vlan 10 and 1.  i checked with a known working network with real equipment and it was working there - it drove me nut coz I could not it anywhere.

 

And all I was trying to do was to create access list labs - how frustrating?

 

I then noticed that on the routed interface (router side) duplex was half / 10.  On switch is was full.  I changed the router side to full / 100 (this side resets itself when you make a change.  Did the same on  switch; no change.  I reset the interface on switch side and the interface came up/up and in trunk mode as I configured it.

 

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