11-10-2005 01:49 PM - edited 03-03-2019 12:46 AM
When port on 3750 is in access mode (vlan 24), and port on 1912 is trunk off, everything is ok. But now I need to communicate the devices via ISL trunk. I had configured both machines by the appropriate tech docs, but i have troubles...
On 1912 machine:
!
ip address 10.195.60.2 255.255.255.0
ip default-gateway 10.195.60.1
!
interface FastEthernet 0/26
duplex full
!
!
trunk On
!
On 3750 machine:
!
interface GigabitEthernet2/0/20
description Trunk to Cisco 1912
switchport encapsulation isl
switchport mode trunk
no mdix auto
!
!
interface Vlan24
ip address 10.195.60.1 255.255.255.0
!
In this way configuration (trunking), there is no ping between them.
May be i do something wron? PLS HELP!
Solved! Go to Solution.
11-10-2005 11:31 PM
Hello,
you are right, your output shows that your 1912 os running VTP version 1, and your 3750 version 2. Make sure the versions are the same on both switches...
Regards,
GP
11-10-2005 02:09 PM
Hello,
can you check the VTP configuration of the 1912 ? AFAIR, the 1912 defaults to VTP server mode, so you either need to create the VLAN (24) on the 1912, or make the 3750 the VTP server and the 1912 the VTP client for the VTP domain...
Regards,
GP
11-10-2005 02:30 PM
Thanks a lot but,
As you can saw above, Vlan is created on 3750, and 3750 is in server mode. 1912 is in client mode.
3750s#show vtp status
VTP Version : 2
Configuration Revision : 101
Maximum VLANs supported locally : 1005
Number of existing VLANs : 39
VTP Operating Mode : Server
VTP Domain Name : Meri
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Enabled
MD5 digest : 0xFA 0x50 0xEE 0xB1 0x16 0x83 0x30 0x34
Configuration last modified by 10.195.0.1 at 11-8-05 08:15:11
Local updater ID is 10.195.0.1 on interface Vl1 (lowest numbered VLAN interface found)
Catalyst_1912#show vtp
VTP version: 1
Configuration revision: 1
Maximum VLANs supported locally: 1005
Number of existing VLANs: 5
VTP domain name : meri
VTP password : password
VTP operating mode : Client
VTP pruning mode : Disabled
VTP traps generation : Enabled
Configuration last modified by: 10.195.60.2 at 00-00-0000 00:00:00
May be configuration of VTP is wrong somewhere?
11-10-2005 02:41 PM
Hello,
VTP domain names are case-sensitive, it looks like you have ´Meri´ (with a capital M) configured on your 3750, and ´meri´ (small caps m) on your 1912, make sure the names match...
Regards,
GP
11-10-2005 03:08 PM
Hm... now i had configured `Meri` on both devices. But still the same problem. May be trouble in the difference of VTP versions?
Statistics:
3750s#show vtp counters
VTP statistics:
Summary advertisements received : 0
Subset advertisements received : 0
Request advertisements received : 46507
Summary advertisements transmitted : 147343
Subset advertisements transmitted : 46516
Request advertisements transmitted : 0
Number of config revision errors : 0
Number of config digest errors : 0
Number of V1 summary errors : 0
VTP pruning statistics:
Trunk Join Transmitted Join Received Summary advts received from
non-pruning-capable device
---------------- ---------------- ---------------- ---------------------------
Gi1/0/1 0 0 0
Gi1/0/2 0 0 0
Gi1/0/4 0 0 0
Gi1/0/8 0 0 0
Gi1/0/12 0 0 0
Gi2/0/5 0 0 0
Gi2/0/8 0 0 0
Gi2/0/15 0 0 0
Gi2/0/19 0 0 0
Gi2/0/20 0 0 0
Catalyst_1912#show vtp statistics
Receive Statistics Transmit Statistics
----------------------------------- -----------------------------------
Summary Adverts 4 Summary Adverts 5
Subset Adverts 0 Subset Adverts 4
Advert Requests 0 Advert Requests 50
Configuration Errors:
Revision Errors 0
Digest Errors 0
VTP Pruning Statistics:
Port Join Received Join Transmitted Summary Adverts received
with no pruning support
---- ------------- ---------------- ------------------------
A 0 0 0
B 0 0 0
11-10-2005 08:44 PM
You are trying to connect Gigaethernet to fastethernet. Is gigaethernet capable of negotiating speed ? Check this. Are you able to ping the switch 1900 from 3750 and vice versa?
11-10-2005 11:31 PM
Hello,
you are right, your output shows that your 1912 os running VTP version 1, and your 3750 version 2. Make sure the versions are the same on both switches...
Regards,
GP
11-11-2005 01:21 AM
Does 1912 suports VTP version 2.0 I can't find it in the command line, and i can not change vtp version on the 3750 because this is the main VTP server of our domain and probably i think it may cause fault of communications to other switches, whic are working via VTP 2
11-11-2005 04:55 AM
Hello,
that is going to be problematic, since 1900 (and 2820) switches only support VTP version 1...
Regards,
GP
11-11-2005 05:08 AM
Ok. How to decrease VTP from 2.0 to 1.0 version on 3750?
11-11-2005 05:14 AM
Hi..
On 3750
conf t
vtp version 1
You are done.
regards,
-amit singh
11-11-2005 05:28 AM
Hello,
watch out though with changing the VTP version: version 1 and 2 are not interoperable. You will loose all connectivity between switches running a different VTP version. It might be a good idea to do this afterhours...:)
Regards,
GP
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