15 vlan limit on a Cisco 3800 router ??


I have had a bizzare error saying that a Cisco 3800 series router has a 15 vlan limit.

Is this true ?

#sho vtp stat
VTP Version                     : 2
Configuration Revision          : 0
Maximum VLANs supported locally : 52
Number of existing VLANs        : 19
VTP Operating Mode              : Transparent
VTP Domain Name                 :
VTP Pruning Mode                : Disabled
VTP V2 Mode                     : Disabled
VTP Traps Generation            : Disabled
MD5 digest                      : 0xDB 0x64 0x9C 0x39 0xFF 0x0D 0x43 0x00
Configuration last modified by at 12-17-09 17:31:03
EdgeA#conf term
Enter configuration commands, one per line.  End with CNTL/Z.
(config)#vlan 120
Vlan can not be added. Maximum number of 15 vlan(s) in the database.

Who is Participating?
Don JohnstonConnect With a Mentor InstructorCommented:
>If I have a router which has two interfaces, each configured as trunks and each with vlan 101 on them.

Sub interfaces on an ethernet inferface of a router allow you to terminate a VLAN.
Depends on the card you have

There are 3 different ones.

EtherSwitch Network Modules (NM-16ESW and NMD-36ESW) 64 vlans

EtherSwitch HWICs (HWIC-4ESW and HWICD-9ESW) 15 vlans

EtherSwitch Service Modules (NME-16ES-1G, NME-16ES-1G-P, NME-X-23ES-1G, NME-X-23ES-1G-P, NME-XD-48ES-2S-P, and NME-XD-24ES-1S-P) 1024 vlans
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Istvan KalmarHead of IT Security Division Commented:
or if you want to give more VLAN I advise to use subinterfaces:

int giga 0/0.1
 encapsulation dot1q 1 native


and it gives you more vlan....
jpbourkeAuthor Commented:
Sub interfaces are sub interfaces off the trunk interface ??
Istvan KalmarHead of IT Security Division Commented:
sub interface of gigabit motherboard port.....
jpbourkeAuthor Commented:

Ahhh.  Ok I have not done sub interfaces before so I am a little unsure.  If I have a router which has two interfaces, each configured as trunks and each with vlan 101 on them.

Does this mean I need a sub interface on both with IP addresses on both ?

With the interface vlan I need only one interface definition, ie, one IP address.



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