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Problem in Trunking two 3560G

Posted on 2009-03-30
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Last Modified: 2012-05-06
I am facing problem in trunking two 3560 G Switches.  

Trunk says up but the vlan stays down.

Switch #1 3560G

interface Port-channel5
 switchport trunk encapsulation dot1q
 switchport mode trunk

interface GigabitEthernet0/17
  switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 5 mode on

 Switch #2

interface Port-channel5
 switchport trunk encapsulation dot1q
 switchport mode trunk

interface GigabitEthernet0/4
  switchport trunk encapsulation dot1q
 switchport mode trunk
 channel-group 5 mode on


Switch (1) is trunked with 5 more 2950 and it works just fine but  for this switch (3560G) - management stays down

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Question by:pehalwaan
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by:Don Johnston
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Is there just the one link between these two switches? If so, why the channel-group command?

Go to the physical interfaces and issue the command "no channel-group 5 mode on".

Secondly, does the VLAN exist? "show vlan brief"
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by:pehalwaan
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Currently there exist only one link. But I plan to add one more as soon as i figure out what's wrong .

vlan exists on switch (1)

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------


1    default                          active    Gi0/20, Gi0/26, Gi0/28, Gi0/29, Gi0/30, Gi0/32, Gi0/39, Gi0/40, Gi0/43, Gi0/44, Gi0/48, Gi0/49, Gi0/50
                                                Gi0/51, Gi0/52
2    VLAN0002                         active
3    VLAN0003                         active
4    VLAN0004                         active
10   VLAN0010                         active
20   VLAN0020                         active
24   VLAN0024                         active
25   VLAN0025                         active
26   VLAN0026                         active
27   VLAN0027                         active
30   VLAN0030                         active
39   VLAN0039                         active
43   VLAN0043                         active
59   VLAN0059                         active
99   VLAN0099                         active
101  VLAN0101                         active
128  VLAN0128                         active
199  VLAN0199                         active    Gi0/3, Gi0/4, Gi0/19, Gi0/23, Gi0/24, Gi0/25, Gi0/31, Gi0/33, Gi0/34, Gi0/35, Gi0/36, Gi0/37, Gi0/38, Gi0/41
                                                Gi0/42, Gi0/45, Gi0/46
200  VLAN0200                         active    Gi0/5, Gi0/6, Gi0/27
201  VLAN0201                         active    Gi0/7, Gi0/8
202  VLAN0202                         active    Gi0/9, Gi0/10
400  VLAN0400                         active    Gi0/1, Gi0/2, Gi0/18, Gi0/22
1002 fddi-default                     act/unsup
1003 token-ring-default               act/unsup
1004 fddinet-default                  act/unsup
1005 trnet-default                    act/unsup

but does not show up on  Switch (2)

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Gi0/1, Gi0/2, Gi0/3, Gi0/5
                                                Gi0/6, Gi0/7, Gi0/8, Gi0/9
                                                Gi0/10, Gi0/11, Gi0/12, Gi0/13
                                                Gi0/14, Gi0/15, Gi0/16, Gi0/17
                                                Gi0/18, Gi0/19, Gi0/20, Gi0/21
                                                Gi0/22, Gi0/23, Gi0/24, Gi0/25
                                                Gi0/26, Gi0/27, Gi0/28, Gi0/29
                                                Gi0/30, Gi0/31, Gi0/32, Gi0/33
                                                Gi0/34, Gi0/35, Gi0/36, Gi0/37
                                                Gi0/38, Gi0/39, Gi0/40, Gi0/41
                                                Gi0/42, Gi0/43, Gi0/44, Gi0/45
                                                Gi0/46, Gi0/47, Gi0/48, Gi0/49
                                                Gi0/50, Gi0/51, Gi0/52
1002 fddi-default                     act/unsup
1003 token-ring-default               act/unsup
1004 fddinet-default                  act/unsup
1005 trnet-default                    act/unsup

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Don Johnston earned 500 total points
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First off, if you don't have multiple links, you don't need etherchannel. So until you get the single link passing traffic, I would get rid of any etherchannel commands.

Second, in order for traffic to pass for a specific VLAN, it must exist on all switches that the traffic will pass through. So go to the switch that doesn't have the VLANs and create them (either manually or with VTP).

Then post the output of "show int status" and "show int trunk".


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by:pehalwaan
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I was able to get that done last night. Thanks for you help.
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