05-04-2018 06:12 AM - edited 03-08-2019 02:54 PM
Hi,
i have 3 Catalyst 2960-X switches:
1. sw1 - main switch, the other switches chained to it by trunk. contain 6 vlans (include vlan1). IP address 192.168.1.2.
2. sw3 - contain 6 vlans (include vlan1). IP address 192.168.1.3.
3. sw7 - contain 3 vlans (include vlan1). IP address 192.168.1.8.
When i try to ping from SW1 to SW3 and vice versa on vlan1 - it works.
When i try to ping from SW1 to SW7 and visa versa on vlan1- its not working.
when i try to ping from SW3 to SW7 and visa versa on vlan1- its not working.
The other VLANs working perfectly.
i checked "Show cdp neighbors" on sw1 and able to see SW3 but not SW7.
i checked vtp domain and mode configured, i check vlan1 is not shutdown. default gateway is configured.
i even tried to connect another switch (2960, not X) and configure it, and its also working properly)
i'm working on it for the last 2 days and start to feel like its a bug. what could be the problem?
i attached configuration file for the 3 switches.
Thank you!
Adi
05-07-2018 07:04 AM
Show VTP Status for all switches:
SW1
SW01#show vtp status
VTP Version capable : 1 to 3
VTP version running : 1
VTP Domain Name : domain
VTP Pruning Mode : Disabled
VTP Traps Generation : Disabled
Device ID : b4a8.b927.dc00
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00
Local updater ID is 192.168.1.2 on interface Vl1 (lowest numbered VLAN interface found)
Feature VLAN:
--------------
VTP Operating Mode : Server
Maximum VLANs supported locally : 1005
Number of existing VLANs : 19
Configuration Revision : 0
MD5 digest : 0x2A 0x6A 0x0B 0xA8 0xC8 0xC3 0x4A 0xF3
0xAE 0x28 0x4A 0xF4 0xA2 0x21 0x15 0x58
*** MD5 digest checksum mismatch on trunk: Gi1/0/23 ***
SW3
SW3#show vtp status
VTP Version capable : 1 to 3
VTP version running : 1
VTP Domain Name : domain
VTP Pruning Mode : Disabled
VTP Traps Generation : Disabled
Device ID : 0027.909e.0080
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00
Feature VLAN:
--------------
VTP Operating Mode : Transparent
Maximum VLANs supported locally : 1005
Number of existing VLANs : 10
Configuration Revision : 0
MD5 digest : 0x91 0xFE 0xED 0xBF 0xBC 0xF1 0x21 0x0F
0xC3 0x61 0x3F 0xC6 0xE7 0x05 0x11 0xB6
SW7
SW7#show vtp status
VTP Version capable : 1 to 3
VTP version running : 1
VTP Domain Name : domain
VTP Pruning Mode : Disabled
VTP Traps Generation : Disabled
Device ID : 2790.9348.1080
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00
Feature VLAN:
--------------
VTP Operating Mode : Transparent
Maximum VLANs supported locally : 1005
Number of existing VLANs : 10
Configuration Revision : 0
MD5 digest : 0x91 0xFE 0xED 0xBF 0xBC 0xF1 0x21 0x0F
0xC3 0x61 0x3F 0xC6 0xE7 0x05 0x11 0xB6
05-07-2018 08:03 AM
Looks like you have an MD5 mismatch between SW1 and SW7 - this is typically caused by an incorrect VTP password. Given that the hash on SW7 and SW3 are the same, I would assume that the ‘bad password’ is on SW1. I don’t necessarily think that this is the root of the ping issue you’re having, but it is something you should rectify.
05-07-2018 09:31 AM
Hello,
just to be sure you have that covered, try another port on SW7 connecting to SW3, and also another cable...
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