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Problems to comunicate Cisco 3750 with 2960

Junior27
Level 1
Level 1

Hi,

 

We have a Cisco 3750 with 12 Fiber Ports. Went this switch was connected to old 2950 works fine but know I am changing to 2960 switches and dont communicate between them. In the Cisco 3750 the trunk port are setup with;

switchport trunk encapsulation dot1q

switchport mode trunk

 

In the 2960 with

switchport mode trunk

 

because the 2960 dont have the option of the encapsulation dot1q

 

And I cant ping from the 3750 to the 2960 and vise-versa 

Any recomendation or additional instruction that I need to add to the 2960 switches?

Please let me know.

 

Thanks

 

 

 

1 Accepted Solution

Accepted Solutions

As per your config my understanding

 

3750 (port  Gig 3/0/1 ) ---Connected --- (Port  Gig 1/0/49) ---2960 

 

Is this correct  ?

 

If So on your 3750 all the ports are in Trunk Mode.

 

Form testing  on 3750 do following steps : ( No changes required on 2960X side for now).

 

config t

!

 

Default interface GigabitEthernet3/0/2
Default interface GigabitEthernet3/0/3

!

interface GigabitEthernet3/0/2

switchport mode access

switchport access vlan 10
!

interface GigabitEthernet3/0/3

switchport mode access

switchport access vlan 1

!

interface Vlan1

no shutdown

!

interface Vlan10

no shutdown

!

 

Try ping locally 

Switch#ping 172.10.5.11

remote  ping 

Switch#ping 172.10.5.15

 

Switch#ping 192.168.120.11

remote  ping 

Switch#ping 192.168.120.15

 

Post the results.  

BB

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View solution in original post

9 Replies 9

Leo Laohoo
Hall of Fame
Hall of Fame
Post the complete output to the command "sh interface trunk".

balaji.bandi
Hall of Fame
Hall of Fame

adding to other post can you also post 

 

show vlan 

show run interface XX (part of trunk)

BB

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Switch#sh run interface vlan 10
Building configuration...

Current configuration : 111 bytes
!
interface Vlan10
ip address 172.10.5.11 255.255.248.0
no ip route-cache
no ip mroute-cache
shutdown
end
Switch#ping 172.10.5.11

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.10.5.11, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
Switch#sh int trunk

Port Mode Encapsulation Status Native vlan
Gi3/0/1 on 802.1q trunking 1
Gi3/0/12 on 802.1q trunking 1

Port Vlans allowed on trunk
Gi3/0/1 1-4094
Gi3/0/12 1-4094

Port Vlans allowed and active in management domain
Gi3/0/1 1
Gi3/0/12 1

Port Vlans in spanning tree forwarding state and not pruned
Gi3/0/1 1
Gi3/0/12 1
Switch#

High level

 

interface Vlan10
ip address 172.10.5.11 255.255.248.0
no ip route-cache
no ip mroute-cache
shutdown   <--- no shut
end

 

test and advise.

BB

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I already made the no shut went I saw that is shutdown
but continue with the same problem that no traffic between the 3750 and the 2 2960.
In the 2960 I can ping the vlan 10 with any problem but in the 3750 I cant ping it

Can you post both the device full configuration.

show run from both the devices.

BB

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How to Ask The Cisco Community for Help

Switch 3750
sh conf
Using 2194 out of 524288 bytes
version 12.2
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
hostname Switch
boot-start-marker
boot-end-marker
enable secret 5 $1$uz8x$CZaA7NOpnMspdsWNVWZbA/
enable password Cisco
no aaa new-model
switch 3 provision ws-c3750g-12s
system mtu routing 1500
spanning-tree mode pvst
spanning-tree extend system-id
vlan internal allocation policy ascending
interface GigabitEthernet3/0/1
description trunk port
switchport trunk encapsulation dot1q
switchport mode trunk
interface GigabitEthernet3/0/2
description trunk port
switchport trunk encapsulation dot1q
switchport mode trunk
interface GigabitEthernet3/0/3
description trunk port
switchport trunk encapsulation dot1q
switchport mode trunk
interface GigabitEthernet3/0/4
description trunk port
switchport trunk encapsulation dot1q
switchport mode trunk
interface GigabitEthernet3/0/5
description trunk port
switchport trunk encapsulation dot1q
switchport mode trunk
interface GigabitEthernet3/0/6
description trunk port
switchport trunk encapsulation dot1q
switchport mode trunk
interface GigabitEthernet3/0/7
description trunk port
switchport trunk encapsulation dot1q
switchport mode trunk
interface GigabitEthernet3/0/8
description trunk port
switchport trunk encapsulation dot1q
switchport mode trunk
interface GigabitEthernet3/0/9
description trunk port
switchport trunk encapsulation dot1q
switchport mode trunk
interface GigabitEthernet3/0/10
description trunk port
switchport trunk encapsulation dot1q
switchport mode trunk
interface GigabitEthernet3/0/11
description trunk port
switchport trunk encapsulation dot1q
switchport mode trunk
interface GigabitEthernet3/0/12
description trunk port
switchport trunk encapsulation dot1q
switchport mode trunk
interface Vlan1
ip address 192.168.120.11 255.255.248.0
shutdown
interface Vlan10
ip address 172.10.5.11 255.255.248.0
no ip route-cache
no ip mroute-cache
ip classless
ip http server
ip http secure-server
line con 0
line vty 0 4
password cisco
login
line vty 5 15
password cisco
login
end

Switch#ping 172.10.5.11
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.10.5.11, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
Switch#ping 172.10.5.15
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.10.5.15, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)

Switch 2960
Using 6320 out of 524288 bytes
! Last configuration change at 06:25:15 UTC Wed Mar 30 2011
! NVRAM config last updated at 06:26:09 UTC Wed Mar 30 2011
version 15.0
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
hostname Switch
boot-start-marker
boot-end-marker
enable secret 5 $1$GbJ3$njIVFNjewYlaEkk4G4KUU1
enable password Cisco
no aaa new-model
switch 1 provision ws-c2960s-48fpd-l
crypto pki trustpoint TP-self-signed-3269795968
enrollment selfsigned
subject-name cn=IOS-Self-Signed-Certificate-3269795968
revocation-check none
rsakeypair TP-self-signed-3269795968
crypto pki certificate chain TP-self-signed-3269795968
certificate self-signed 01 nvram:IOS-Self-Sig#1.cer
spanning-tree mode pvst
spanning-tree extend system-id
vlan internal allocation policy ascending
interface FastEthernet0
no ip address
shutdown
interface GigabitEthernet1/0/1
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/2
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/3
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/4
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/5
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/6
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/7
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/8
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/9
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/10
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/11
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/12
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/13
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/14
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/15
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/16
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/17
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/18
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/19
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/20
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/21
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/22
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/23
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/24
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/25
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/26
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/27
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/28
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/29
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/30
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/31
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/32
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/33
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/34
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/35
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/36
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/37
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/38
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/39
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/40
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/41
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/42
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/43
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/44
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/45
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/46
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/47
description vlan 1
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/48
description vlan 10
switchport access vlan 10
switchport mode access
spanning-tree portfast
interface GigabitEthernet1/0/49
description port trunk
switchport mode trunk
interface GigabitEthernet1/0/50
interface TenGigabitEthernet1/0/1
interface TenGigabitEthernet1/0/2
interface Vlan1
ip address 192.168.120.15 255.255.255.0
shutdown
interface Vlan10
ip address 172.10.5.15 255.255.248.0
no ip route-cache
ip http server
ip http secure-server
line con 0
line vty 0 4
password cisco
login
line vty 5 15
password cisco
login
end

Switch#ping 172.10.5.15
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.10.5.15, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
Switch#ping 172.10.5.11
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.10.5.11, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
Switch#

As per your config my understanding

 

3750 (port  Gig 3/0/1 ) ---Connected --- (Port  Gig 1/0/49) ---2960 

 

Is this correct  ?

 

If So on your 3750 all the ports are in Trunk Mode.

 

Form testing  on 3750 do following steps : ( No changes required on 2960X side for now).

 

config t

!

 

Default interface GigabitEthernet3/0/2
Default interface GigabitEthernet3/0/3

!

interface GigabitEthernet3/0/2

switchport mode access

switchport access vlan 10
!

interface GigabitEthernet3/0/3

switchport mode access

switchport access vlan 1

!

interface Vlan1

no shutdown

!

interface Vlan10

no shutdown

!

 

Try ping locally 

Switch#ping 172.10.5.11

remote  ping 

Switch#ping 172.10.5.15

 

Switch#ping 192.168.120.11

remote  ping 

Switch#ping 192.168.120.15

 

Post the results.  

BB

***** Rate All Helpful Responses *****

How to Ask The Cisco Community for Help

Hi Balaji.bandi,

 

You are the best. I configure the instruction you send me and now is working. I saw that the 3750 don't create the vlan 10 until I setup a port with this vlan and that was the problem.

 

Thanks a lot