Not able to create vlan with vlan id more than 1025

[sasj0e]

Hi,
I am not able to create vlans with vlan id more than 1025 on Cisco 4006 with sup2 and cat IOS 7.3.
It flags out the following error when I tried to create a vlan with vlan id 1026
"Cannot set vlans in extended range.
Reduced Mac Address feature is disabled in NVRAM"

Is it possible to enable this feature?

Thanks,
Sas

 

[crazynoodle]

Before configuring extended-range VLANs, VLANs 1025-4094, you must first enable MAC address reduction. When you enable MAC address reduction the system commits the IDs for extended-range VLANs. After you enable MAC address reduction, you cannot disable it as long as any extended-range VLANs exist.

 

[crazynoodle]

forgot this..

set spantree macreduction enable

 

[sasj0e]

I think, even if I have some vlan mapping already, this also prevents creating vlans extended range..
Just learnt this..from cisco site.

But do you have any idea on vlan mapping ??Is it possible to have one to many vlan mappings ..
For example if I have one vative vlan say vlan 1 (degault) can I map many dot1q vlans to this isl vlan? say some thing like
set vlan mapping dot1q 1020 isl 1
set vlan mapping dot1q 1021 isl 1..and so on
or in any way can I do this?
Thanks for the help.
sas

 

[crazynoodle]

It is a one for one mapping.

You can map up to seven VLANs. Only one 802.1Q VLAN can be mapped to an ISL VLAN. For example, if 802.1Q VLAN 800 has been automatically mapped to ISL VLAN 800, do not manually map any other 802.1Q VLANs to ISL VLAN 800.