3550 EMI and 1912A VLAN/Trunking

[rgrcommo]

Can someone let me know why I cannot see the VLANs on the 1912 from the 3550? From the 3550 I can ping the ip on the 1912 across the trunk but am not able to ping any of the other IP's on the 1912 from the 3550. These IP’s are on different VLANs ( 6, 50 ) I know you can not do inter-VLAN routing on the 1912 w/o using a router however, I am almost certain you can using ISL trunking.. Am I wrong? Any suggestions to steer me in the right direction - thanks!

Here is the 1912 config:

Cat1912A#sh ver

Cisco Catalyst 1900/2820 Enterprise Edition Software

Version V9.00.06

Copyright (c) Cisco Systems, Inc. 1993-1999

Cat1912A uptime is 0day(s) 06hour(s) 57minute(s) 22second(s)

cisco Catalyst 1900 (486sxl) processor with 2048K/1024K bytes of memory

Hardware board revision is 5

Upgrade Status: No upgrade currently in progress.

Config File Status: No configuration upload/download is in progress

15 Fixed Ethernet/IEEE 802.3 interface(s)

Base Ethernet Address: 00-08-E3-93-41-40

Cat1912A#

######### Here is the Truning info for the 1912 #####################

Cat1912A#sh trunk b joining-vlans

1, 6, 50

Cat1912A#sh trunk b joined

Cat1912A#sh trunk b joined-vlans

1-2, 4

Cat1912A#sh trunk b

DISL state: Desirable, Trunking: On, Encapsulation type: ISL

!

--More--

!

interface FastEthernet 0/27

duplex full

!

!

trunk Desirable

!

line console

end

Cat1912A#

Cat1912A#sh vtp

VTP version: 1

Configuration revision: 12

Maximum VLANs supported locally: 1005

Number of existing VLANs: 11

VTP domain name : cisco

VTP password : cisco

VTP operating mode : Client

VTP pruning mode : Enabled

VTP traps generation : Disabled

Configuration last modified by: 10.1.1.248 at 00-00-0000 00:00:00

######### Here is the 3550 Info #############

cat3550#sh vtp status

VTP Version : 2

Configuration Revision : 14

Maximum VLANs supported locally : 1005

Number of existing VLANs : 8

VTP Operating Mode : Server

VTP Domain Name : cisco

VTP Pruning Mode : Enabled

VTP V2 Mode : Enabled

VTP Traps Generation : Disabled

MD5 digest : 0x48 0x3B 0x8B 0xFE 0x74 0x3D 0x10 0x83

Configuration last modified by 10.1.1.254 at 3-3-93 22:20:52

Local updater ID is 10.1.1.254 on interface Vl1 (lowest numbered VLAN interface found)

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

here is the TRUNK on f0/24

!

interface FastEthernet0/24

switchport trunk encapsulation isl

switchport trunk allowed vlan 1,2,4

switchport mode trunk

end

cat3550#

cat3550#sh int trunk

Port Mode Encapsulation Status Native vlan

Fa0/24 on isl trunking 1

Port Vlans allowed on trunk

Fa0/24 1-2,4

Port Vlans allowed and active in management domain

Fa0/24 1-2,4

Port Vlans in spanning tree forwarding state and not pruned

Fa0/24 1

cat3550#

[Georg Pauwen]

Hello,

the problem is that your 3550 uses VTP version 2, while your 1912 uses VTP version 1.

VTP version 1 and VTP version 2 are not interoperable on switches in the same VTP domain. Every switch in the VTP domain must use the same VTP version. Either enable VTP version 2 on your 1912 (not sure if that is supported), or disable VTP version version 2 on your 3550.

HTH,

Georg

[rgrcommo]

Thanks very much! Yes that is the case, however I still see no changes i.e. 3550 can't ping other VLANs on the 1912. I still would like to know if you are able to ping in different VLANs with the ISL trunking..? And yes, you are correct about the VTP version on the 1912 - it only has ver 1.

[#4]

Firstly make sure your 3550 is not 3550/SMI but 3550/EMI, meanining 3550 layer-3 switch.

Secondly, I don't see any VLAN ip assignment in your configuration. Without enabling layer3, I don't think you can ping different VLAN.

[rgrcommo]

Yes i have it working now. Turned off VTP ver 2 and made it ver 1. Then added a vlan 1 and 1005 on the 3550 and now it can see the vlans!

thanks.