Extended VLANs can't be configured from the vlan database mode, and must be configured from the global configuration mode.
% Warning: It is recommended to configure VLAN from config mode,
as VLAN database mode is being deprecated. Please consult user
documentation for configuring VTP/VLAN in config mode.
<1-1005> ISL VLAN index
Enter configuration commands, one per line. End with CNTL/Z.
WORD ISL VLAN IDs 1-4094
access-map Create vlan access-map or enter vlan access-map command mode
dot1q dot1q parameters
filter Apply a VLAN Map
internal internal VLAN
 Tried to do this for a 3548XL i have (while the above output was from a 3560), and i found out that further on the 3500XL doesn't support extended VLANs:
"The 2900XL and 3500XL can use only VLANs in the range of 1 to 1001, and they do not support extended-range VLANs. If you upgrade the software of the switch, it does not bring an enhancement to support the configuration of extended-range VLANs."
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
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